Annual/Termination Reports:

[12/15/2010] [12/31/2011] [12/11/2012] [06/16/2013] [03/01/2014] [06/30/2014]

Report Information

Participants

All meeting participants from our Fall Meeting and Scientific can be found at our website (http://nadp.isws.illinois.edu/committees/minutes.aspx), and are available for viewing and download.

Brief Summary of Minutes

All meeting minutes from our Spring Meeting (Business Meeting) and our Fall Meeting and Scientific Symposium (both Oct 2009, and now Oct 2010 minutes) can be found at our website(http://nadp.isws.illinois.edu/committees/minutes.aspx), and are available for viewing and download.

Accomplishments

The NRSP-3 provides a framework for cooperation among State Agricultural Experiment Stations (SAES), the U.S. Department of Agriculture, and other governmental and nongovernmental organizations that support the National Atmospheric Deposition Program (NADP). The NADP provides quality-assured data and information on the exposure of managed and natural ecosystems and cultural resources to acidic compounds, nutrients, base cations, and mercury in precipitation and through dry deposition of these same compounds. NADP data support informed decisions on air quality issues related to precipitation chemistry.<br /> <br /> Specifically, researchers use NADP data to investigate the impacts of atmospheric deposition on the productivity of managed and natural ecosystems; the chemistry of estuarine, surface, and ground waters; and the biodiversity in forests, shrubs, grasslands, deserts, and alpine vegetation. These research activities address environmental stewardship, one of the Experiment Station Sections research challenges. Researchers also use NADP Mercury Deposition Network data to examine the role of atmospheric deposition in affecting the mercury content of fish, and to better understand the link between environmental and dietary mercury and human health. This fits with another research priority of relationship of food to human health.<br /> <br /> The NADP operates three precipitation chemistry networks: the National Trends Network (NTN), the Atmospheric Integrated Research Monitoring Network (AIRMoN), and the Mercury Deposition Network (MDN). At the end of September, 2010, 244 NTN stations were collecting one-week precipitation samples in 48 states, Puerto Rico, the Virgin Islands, and Quebec Province, Canada. The NTN provides the only long-term nationwide record of basic ion wet deposition in the United States. Complementing the NTN are the 7-site AIRMoN and the 116-site MDN. Data from daily precipitation samples collected at AIRMoN sites support continued research of atmospheric transport and removal of air pollutants and development of computer simulations of these processes. The MDN offers the only long-term and routine measurements of mercury in North American precipitation. These data are used to quantify mercury deposition to water bodies that have fish and wildlife consumption advisories due to this toxic chemical. In 2008, every state and 10 Canadian provinces listed advisories warning people to limit fish consumption due to high mercury levels. Coastal advisories are also in place for Atlantic waters from Maine to Rhode Island, from North Carolina to Florida, for the entire U.S. Gulf Coast, and for coastal Hawaii and Alaska.<br /> <br /> Short-term Outcomes and Outputs.<br /> <br /> Samples Collected. Our principal objective and accomplishment/outcome for this project is the collection and analysis of samples for precipitation chemistry. Briefly, the NADP processed a total of 13,075 weekly precipitation samples from the NTN. These include 12,694 samples and 381 quality assurance samples. The chemical analyses include observations of 10 different analyte concentrations and precipitation volume, which allow for calculation of deposition flux for each analyte. These same data are collected daily (i.e., every day with measurable precipitation) from the 7-site AIRMoN network. For the year, AIRMoN collected and processed 1,059 precipitation samples, including 146 quality assurance samples. The MDN collected and processed 7,199 weekly mercury-in-precipitation samples during the year, including approximately 300 quality assurance samples.<br /> <br /> NADP Data. Our second most important accomplishment or outcome is making data available to all for the support of continued research. Scientists, policymakers, educators, students, and others are encouraged to access data at no charge from the NADP website (http://nadp.isws.illinois.edu). This site offers online retrieval of individual data points, seasonal and annual averages, trend plots, concentration and deposition maps, reports, manuals, and other data and information about the program. As of today, 2009 calendar year data are complete and online, with data through June of 2010 available within weeks. Website usage statistics provide evidence that our data are being used. During FY2010, website usage continued to grow. There are now more than 39,000 registered users with over 356,000 independent user sessions. There were almost 27,000 data downloads from the site (specifically, 26,938). The site received more than 1.505 million webpage hits, and our data maps were viewed approximately 124,000 times. Information about users is collected, and the user types include about 33 percent from federal and state agencies, 33 percent from universities, 20 percent from K-to-12 schools, and 14 percent from other organizations. The NADP website has registered users from more than 150 countries over the globe. These statistics demonstrate that NADP continues to be relevant to both the scientific and educational communities, and to attract new users.<br /> <br /> Map Summary. During FY10, annual maps of atmospheric pollutants, concentrations, and depositions were developed for 2009 calendar year measurements. These maps are used widely for a number of reasons, and constitute one of the major products of the network. Individual maps are filed by network, year, and constituent (see examples at http://nadp.isws.illinois.edu/data/annualiso.aspx). Individual maps are compiled into annual Map Summary reports (http://nadp.isws.illinois.edu/lib/dataReports.aspx). We also completed the distribution of approximately 1,800 printed FY08 Map Summaries, and printed and began distributing 2000 of the 2009 Map Summaries in August. The Summary is available for all to download. <br /> <br /> Scientific Meeting (Fall 2009). At the end of each federal year, a scientific meeting is held that showcases some of the latest deposition research that occurred during the year. During FY2010 (Saratoga Springs, NY, Oct. 68), the meeting focused on Bridging Air and Ecosystems. The meeting attracted more than 175 registered participants (our largest ever), and provided more than 40 speakers (two keynotes) organized into 7 sessions, which included, Are Ecosystems Responding to Emission Reductions? and Agricultural Emissions and Ecosystem Effects. All presentations, posters, and meeting proceedings are available on the NADP website (http://nadp.isws.illinois.edu/meetings/fall2009/post/).<br /> <br /> Scientific Meeting (Fall 2010). The latest meeting, the Fall 2010 Meeting and Scientific Symposium, was held in October 2010 (after these report dates) in Truckee, CA. It was focused on Networking the Networks and was meant to foster collaboration between networks, produce more information with the same effort, and so forth. There were 152 participants, 2 keynote addresses, 35 speakers, and 31 poster presentations in 6 sessions focusing on networks monitoring in the environment. These sessions included Climate Change and Soil Networks. Committee minutes, proceedings, and scientific presentations are available on the website.<br /> <br /> Preparations are well underway for our next Fall Technical and Scientific Symposium in Providence, Rhode Island on October 25 to 28, 2011. All meeting information, registration, payment, and other details will be made available online soon.<br /> <br /> These basic activities fulfilled the project objectives: (1) coordination of three networks; (2) quality assurance to ensure consistency; and (3) analytical, site support, and data validation services for the sites supported directly through this agreement.<br /> <br /> Network Operation Notes. The NADP continues to convert our precipitation gages to an all-digital network, originating with a Technical Committee decision in 2006 (http://nadp.isws.illinois.edu/newissues/newgages/newequip.aspx). Currently, the network is well on its way to completing this goal. In mid- FY10, 50 percent of our sites (approximately 150 sites) were using and reporting digital precipitation data (15-minute observations).<br /> <br /> Updated versions of the following quality assurance documents were produced and approved at the Fall 2009 meeting: 1) Quality Management Plan; 2) Quality Assurance Plan; 3) Guidelines for NADP Laboratory Quality Assurance Reports; 4) Guidelines for NADP Laboratory Reviews; 5) Guidelines for NADP Quality Management System Review; 6) NADP Site Information Worksheet; 7) NADP Site Selection and Installation Manual; and 8) Guide for New NADP Initiatives. These documents were all in use during the year (http://nadp.sws.uiuc.edu/lib/qaPlans.aspx).<br /> <br /> Further, the U.S. Geological Survey conducted an external review of our laboratories, with 360 performance evaluation samples for the NTN, 216 performance evaluation samples for the MDN, 100 field audit samples to NTN site operators and 115 system blank samples to MDN site operators, and 20 blind Audit Program samples to MDN site operators.<br /> <br /> Other Notes. In November 2004, the U.S. Department of Agriculture (USDA) Animal and Plant Health Inspection Service issued the first report of Phakopsora pachyrhizi, commonly known as Asian Soybean Rust (ASR), in the continental U.S. ASR is an obligate fungal parasite that can cause significant losses in soybean and other leguminous crops. From infected plants, ASR spreads through the aerial release and dispersal of spores. These airborne spores can be scavenged in and below clouds and deposited by rain on uninfected host plants hundreds of kilometers from an existing infection. During the 2010 growing season, NADP again partnered with the USDA Cereal Disease Laboratory (CDL) to look for ASR spores in NTN samples (5th year). With partial support from the Agricultural Research Service, weekly samples from 80 eastern U.S. NTN sites were selected and are undergoing study. Additionally, a new wheat rust investigation, also with CDL, began in November 2009. This initiative will investigate 44 Southern U.S. sites and weekly precipitation samples for several strains of winter wheat rust. Results should be available for the FY11 report.<br /> <br /> The presence of ammonia gas in the atmosphere and its association with agricultural operations has become a very important topic of discussion, and NADP is continuing with an ammonia monitoring network across the central part of the U.S. and Canada. The goal is to develop, deploy, and operate a cost-efficient passive sampling network for basic ammonia gas concentrations. During FY2010, the networks 21 sites collected 2,051 observations of ammonia in the atmosphere, principally across the U.S. Midwest. These two-week integrated values will be used to quantify the spatial and temporal differences in atmospheric ammonia concentrations and estimate dry deposition of ammonia nitrogen. The network includes a quality assurance program to document the accuracy of passive samplers. Following NADP methods, the resulting quality-assured concentrations will be reported and made available for use by all data users. (At the FY10 Fall Meeting, this new network was added.) More information can be found at http://nadp.isws.illinois.edu/nh3net/. This network has numerous implications for agriculture, including directly addressing Challenge Area #2 in The Science Roadmap for Agriculture.<br /> <br /> The NADP, with support from USGS, worked on its ability to capture the analyte bromine in its NTN samples. Bromide is released into the environment via natural and anthropogenic processes, including agricultural fumigants and flame-retardants. Methyl bromide is classified as an ozone-depleting substance, and its use is strictly regulated and monitored by the U.S. EPA. Although there are regulations in place, there is still a concern about the amount of bromide present in the atmosphere. During FY11, regular collection and reporting of this analyte is planned.<br /> <br /> Scientists at the U.S. Environmental Protection Agency supported research at the NADPs Central Analytical Laboratory to determine whether organic nitrogen deposition can be measured reliably and accurately in weekly NTN samples. Preliminary results from these tests indicate a seasonal trend in organic nitrogen concentrations. Furthermore, these concentrations may account for as much as one-third of total nitrogen deposition. This added information contributes to the understanding of our current inorganic nitro¬gen measurements and deposition patterns. Results are forthcoming in the FY11 year.<br /> The NRSP-3 has enhanced our website to better serve our members and data users. <br /> <br /> During the 2010 calendar year, 145 journal articles and reports were generated using the NADP data in some form. These are listed in the Publications section. This is again evidence that NADP is producing data that are both valuable and useful.<br /> <br /> Milestones<br /> <br /> 1. To date, nearly 400,000 observations of precipitation chemistry are archived by the NADP (NTN and AIRMoN). More importantly, all of these remain available in our database, and are comparable over the years for research.<br /> <br /> 2. At the NADP Fall 2009 Meeting and Scientific Symposium, the technical sub-committees voted to approve the Atmospheric Mercury Network (AMNet) as an official NADP network. This is the fourth network of the NADP in our 32-year history. This network has operated as an NADP special study since 2008. The focus of AMNet is the measurement of atmospheric mercury concentrations across North America. These data will be used to model dry deposition of mercury to the environment. Currently, AMNet has 21 sites. On-site analyzers measure atmospheric mercury concentrations on a continuous (15 minute) basis. More information about AMNet can be found at http://nadp.isws.illinois.edu/amn/. <br /> During this next federal year, quality-assured data will be moved to the web to support future research. <br />

Publications

Approximately 141 publications used NADP data or resulted from NRSP-3 activities in 2010 (January to December 15). A publically available online database that lists citations using NADP data is accessible at: http://nadp.isws.illinois.edu/lib/bibsearch.asp.<br /> <br /> 1. Adams, Mary Beth, Loughry, L., Plaugher, L. (cpl.), 2010. Experimental forests and ranges of the USDA Forest Service. USDA Forest Service Publication, http://hdl.handle.net/1957/17290.<br /> <br /> 2. Allen, Daniel, J., Brent, G.F., 2010. Sequestering CO2 by Mineral Carbonation: Stability against Acid Rain Exposure. Environmental Science & Technology 44 (7): 2735-2739.<br /> <br /> 3. Ashton, Isabel W., Miller, A.E., Bowman, W.D., Suding, K.N., 2010. Niche complementarity due to plasticity in resource use: plant partitioning of chemical N forms. Ecology 91: 32523260, doi:10.1890/09-1849.1.<br /> <br /> 4. Bash, Jesse O., 2010. Description and initial simulation of a dynamic bidirectional airsurface exchange model for mercury in Community Multiscale Air Quality (CMAQ) model. Journal of Geophysical Research 115: D06305, doi:10.1029/2009JD012834.<br /> <br /> 5. Batson, Jacqulyn Ann, 2010. Denitrification and a Nitrogen Budget of Created Riparian Wetlands. Masters Thesis in partial fulfillment for the Degree Master of Science, Ohio State University.<br /> <br /> 6. Beavers, B.W., Liu, Z., Cox, M.S., Kingery, W.L., Brink, G.E., Gerard, P.D., McGregor, K.C., 2010. Phosphorus Dynamics in Two Poultry-Litter Amended Soils of Mississippi Under Three Management Systems. Pedosphere 20(2): 217228.<br /> <br /> 7. Beem, Katherine B., Raja, S., Schwandner, F.M., Taylor, C., Lee, T., Sullivan, A.P., Carrico, C.M., McMeeking, G.R., Day, D., Levin, E., Hand, J., Kreidenweis, S.M., Schichtel, B., Malm, W.C., Collett, J.L. Jr., 2010. Deposition of reactive nitrogen during the Rocky Mountain Airborne Nitrogen and Sulfur (RoMANS) study. Environmental Pollution 158(3): 862-872, doi: 10.1016/j.envpol.2009.09.023.<br /> <br /> 8. Beltran, Bray J., Amatya, D.M., Youssef, M., Jones, M., Callahan, T.J., Skaggs, R.W., Nettles, J.E., 2010. Impacts of Fertilization on Water Quality of a Drained Pine Plantation: A Worst Case Scenario. Journal of Environmental Quality 39: 293303.<br /> <br /> 9. Bohl Bormann, Nancy, L, Baxter, C.A., Adraski, T.W., Good, L.W., Bundy, L.G., 2010. Source Water Effects on Runoff Amount and Phosphorus Concentration under Simulated Rainfall. Soil Science Society of America Journal 74: 612618.<br /> <br /> 10. Burkle, Laura A., Irwin, R.E., 2010. Beyond biomass: measuring the effects of community-level nitrogen enrichment on floral traits, pollinator visitation and plant reproduction. Journal of Ecology 98: 705717, doi: 10.1111/j.1365-2745.2010.01648.x<br /> <br /> 11. Caffrey, J.M., Landing, W.M., Nolek, S.D., Gosnell, K., Bagui, S.S., Badui, S.C., 2010. Atmospheric deposition of mercury and major ions to the Pensacola Bay (Florida) watershed: spatial, seasonal, and inter-annual variability. Atmospheric Chemistry and Physics Discussion 10: 45934616, www.atmos-chem-phys-discuss.net/10/4593/2010/.<br /> <br /> 12. Cai, Meijun, Schwartz, J., Robinson, R., Moore, S., Kulp, M., 2010. Long-Term Effects of Acidic Deposition on Water Quality in a High-Elevation Great Smoky Mountains National Park Watershed: Use of an Ion InputOutput Budget. Water, Air & Soil Pollution 209(1): 143-156, doi: 10.1007/s11270-009-0187-5.<br /> <br /> 13. Chang, Ya-Mei, Hsu, N.-J., Huange, H.-C., 2010. Journal of Computational and Graphical Statistics 19(1): 117-139, doi:10.1198/jcgs.2010.07157.<br /> <br /> 14. Civerolo, K., Hogrefe, C., Zalewsky, E., Hao, W., Sistla, G., Lynn, B., Rosenzweig, C., Kinney, P.L., 2010. Evaluation of an 18-year CMAQ simulation: Seasonal variations and long-term temporal changes in sulfate and nitrate. Atmospheric Environment 44(31): 3745-3752, doi: 10.1016/j.atmosenv.2010.06.056.<br /> <br /> 15. Clow, David W., Mast, M.A., 2010. Mechanisms for chemostatic behavior in catchments: Implications for CO2 consumption by mineral weathering. Chemical Geology 269: 4051.<br /> <br /> 16. Clow, David W., Nanus, L., Huggett, B., Use of regression-based models to map sensitivity of aquatic resources to atmospheric deposition in Yosemite National Park, USA. Water Resources Research 46: W09529, doi:10.1029/2009WR008316.<br /> <br /> 17. Coconino County, 2010. Lake Mary Regional TMDL For Mercury in Fish Tissue: Upper Lake Mary, Lower Lake Mary, Soldiers Lake, Soldiers Annex Lake, and Lower Long Lake Little Colorado River Watershed., State of Arizona, Department of Environmental Quality, Open File Report #OFR 10-02 http://www.azdeq.gov/environ/water/assessment/download/Lake_Mary_Region_Draft-6-16-2010.pdf.<br /> <br /> 18. Converse, A.D., Riscassi, A.L., Scanlon, T.M., 2010. Seasonal variability in gaseous mercury fluxes measured in a high-elevation meadow. Atmospheric Environment 44(18): 2176-2185, doi 10.1016/j.atmosenv.2010.03.024.<br /> <br /> 19. Corvo, F., Reyes, J., Valdes, C., Villasenor, F., Cuesta, O., Aguilar, D., Quintana, P., 2010. Influence of Air Pollution and Humidity on Limestone Materials Degradation in Historical Buildings Located in Cities Under Tropical Coastal Climates. Water, Air & Soil Pollution 205: 359375, doi 10.1007/s11270-009-0081-1.<br /> <br /> 20. Croft, B., Lohmann, U., Martin, R.V., Stier, P., Wurzler, S., Feichter, J., Hoose, C., Heikkil, U., van Donkelaar, A., Ferrachat, S., 2010. Influences of in-cloud aerosol scavenging parameterizations on aerosol concentrations and wet deposition in ECHAM5-HAM. Atmospheric Chemistry and Physics 10: 15111543.<br /> <br /> 21. Cusack, D.F., Torn, M.S., McDowell, W.H., Silver, W.L., 2010. The response of heterotrophic activity and carbon cycling to nitrogen additions and warming in two tropical soils. Global Change Biology 16: 25552572, doi: 10.1111/j.1365-2486.2009.02131.x.<br /> <br /> 22. Daley, Michelle, Potter, J., Difranco, E., McDowell, W.H., 2010. Nitrogen Assessment for the Lamprey River Watershed, New Hampshire Water Resources Research Center (NH WRRC), Department of Natural Resources, The State of New Hampshire, http://des.nh.gov/organization/divisions/water/wmb/coastal/documents/unh_nitrogenassessment.pdf.<br /> <br /> 23. David, Mark B., Drinkwater, L.E., McIsaac, G.F., 2010. Sources of Nitrate Yields in the Mississippi River Basin. Journal of Environmental Quality 39: 16571667, doi:10.2134/jeq2010.0115.<br /> <br /> 24. Dayyania, Shadi, Prasherb, S.O., Madanic, A., Madramootoob, C.A., Development of DRAINWARMF model to simulate flow and nitrogen transport in a tile-drained agricultural watershed in Eastern Canada. Agricultural Water Management 98: 5568.<br /> <br /> 25. Dennis, Robin, L., Mathur, R., Pleim, J.E., Walker, J.T., 2010. Fate of ammonia emissions at the local to regional scale as simulated by the Community Multiscale Air Quality model. Atmospheric Pollution Research 1: 207214.<br /> <br /> 26. Di Vittorio, Alan, V., Anderson, R.S., White, J.D., Miller, N.L., Running, S.W., 2010. Development and optimization of an Agro-BGC ecosystem model for C4 perennial grasses. Ecological Modeling 221(17): 2038-2053, doi:10.1016/j.ecolmodel.2010.05.013.<br /> <br /> 27. Drevnick, P.E., Shinneman, A.L.C., Lamborg, C.H., Engstrom, D.R., Bothner, M.H., Oris, J.T., 2010. Mercury Flux to Sediments of Lake Tahoe, CaliforniaNevada. Water, Air, and Soil Pollution 210(1-4): 399-407, doi 10.1007/s11270-009-0262-y.<br /> <br /> 28. Engle, M. A., Tate, M. T., Krabbenhoft, D. P., Schauer, J. J., Kolker, A., Shanley, J. B., and Bothner, M. H., 2010. Comparison of atmospheric mercury speciation and deposition at nine sites across central and eastern North America. Journal of Geophysical Research 115: D18306, doi: 10.1029/2010JD014064.<br /> <br /> 29. Ewing, H.A., Groffman, P.M., Frank, D.A., 2010. Grazers and soil moisture determine the fate of added 15NH4+ in Yellowstone grasslands. Plant Soil 328: 337351, doi: 10.1007/s11104-009-0113-z.<br /> <br /> 30. Fang, Y., Fiore, A.M., Horowitz, L.W., Levy, H., Hu, Y., Russell, A.G., 2010. Sensitivity of the NOy budget over the United States to anthropogenic and lightning NOx in summer. Journal of Geophysical Research 115: D18312, doi:10.1029/2010JD014079.<br /> <br /> 31. Fenn, Mark. E., Allen, E.B., Weiss, S.B., Jovan, S., Geiser, L.H., Tonnesen, G.S., Johnson, R.F., Rao, L.E., Gimeno, B.S., Yuan, F., Meixner, T., Bytnerowicz, A., 2010. Nitrogen critical loads and management alternatives for N-impacted ecosystems in California. Journal of Environmental Management 91: 2404-2423.<br /> <br /> 32. Filippa, Gianluca, Freppaz, M., Williams, M.W., Zanini, E., 2010. Major element chemistry in inner alpine snowpacks (Aosta Valley Region, NW Italy). Cold Regions Science and Technology 64 (2): 158.166, doi:10.1016/j.coldregions.2010.07.005.<br /> <br /> 33. Florida, State of, 2010. Site-Specific Information in Support of Establishing Numeric Nutrient Criteria for Choctawhatchee Bay, Florida Department of Environmental Protection, Tallahassee, FL 32399.<br /> <br /> 34. Florida, State of, 2010. Site-Specific Information in Support of Establishing Numeric Nutrient Criteria in Ochlockonee Bay. Division of Environmental Assessment and Restoration, Florida Department of Environmental Protection, Tallahassee, FL 32399.<br /> <br /> 35. Florida, State of, 2010. Site-Specific Information in Support of Establishing Numeric Nutrient Criteria for the Springs Coast, Florida. Department of Environmental Protection, Tallahassee, FL 32399, http://www.dep.state.fl.us/water/wqssp/nutrients/docs/estuarine/pinellaspark/springs_coast_082010.pdf.<br /> <br /> 36. Florida, State of, 2010. Site-Specific Information in Support of Establishing Numeric Nutrient Criteria for St. Joseph Bay. Division of Environmental Assessment and Restoration, Florida Department of Environmental Protection, Tallahassee, FL 32399. http://www.dep.state.fl.us/water/wqssp/nutrients/docs/estuarine/tallahassee/st_joe_bay_081310.pdf.<br /> <br /> 37. Follstad Shaw, J.J., Harner, M.J., Tibbets, T.M., 2010. Elaeagnus angustifolia Elevates Soil Inorganic Nitrogen Pools in Riparian Ecosystems. Ecosystems 13: 4661, doi: 10.1007/s10021-009-9299-4.<br /> <br /> 38. Fu, X., Feng, X., Zhu, W., Rothenberg, S., Yao, H., Zhang, H., 2010. Elevated atmospheric deposition and dynamics of mercury in a remote upland forest of southwestern China. Environmental Pollution 158(6): 2324-2333, doi: 10.1016/j.envpol.2010.01.032.<br /> <br /> 39. Gaddis, Erica, Voinov, A., 2010. Spatially Explicit Modeling of Land Use Specific Phosphorus Transport Pathways to Improve TMDL Load Estimates and Implementation Planning. Water Resources Management 24: 1621-1644, doi: 10.1007/s11269-009-9517-z.<br /> <br /> 40. Gahl, M.K., Calhoun, A.J.K., 2010. The role of multiple stressors in ranavirus-caused amphibian mortalities in Acadia National Park wetlands. Canadian Journal of Zoology, 88: 108-121.<br /> <br /> 41. Garvey, James, Ickes, B., Zigler, S., 2010. Challenges in merging fisheries research and management: the Upper Mississippi River experience. Hydrobiologia 640: 125144, doi: 10.1007/s10750-009-0061-x.<br /> <br /> 42. Geiser, Linda H., Jovan, S.E., Glavich, D.A., Porter, M.K., 2010. Lichen-based critical loads for atmospheric nitrogen deposition in Western Oregon and Washington Forests, USA. Environmental Pollution 158(7): 2412-2421, doi: 10.1016/j.envpol.2010.04.001.<br /> <br /> 43. Gil, Inigo San, White, M., Melendez, E., Vanderbilt, K., 2010. Case Studies of Ecological Integrative Information Systems: The Luquillo and Sevilleta Information Management Systems. Communications in Computer and Information Science 108: 18-35, doi: 10.1007/978-3-642-16552-8_3.<br /> <br /> 44. Gilbert, Douglas, Wieckowicz, R., Kang, W.-J., Wilcox, E.G., Ralys, B., 2010. TMDLs for Munson Slough WBID 807D (Dissolved Oxygen), Lake Munson WBID 807C [Dissolved Oxygen, Nutrients (Trophic State Index), and Turbidity] and Munson Slough Below Lake Munson WBID 807 (Dissolved Oxygen and Un-ionized ammonia). Florida Department of Environmental Protection, 136 pages.<br /> <br /> 45. Godsey, Sarah E., Aas, W., Clair, T.A., deWit, H.A., Fernandez, I.J., Kahl, J.S., Malcolm, I.A., Neal, C., Neal, M., Nelson, S.J., Norton, S.A., Palucias, M.C., Skjelkvale, B.L., Soulsby, C., Tetzlaff, D., Kirchner, J.W., 2010. Generality of fractal 1/f scaling in catchment tracer time series, and its implications for catchment travel time distributions. Hydrologic Processes 24: 16601671.<br /> <br /> 46. Goel, Anubha., McConnell, L.L., Torrents, A., Kuang, Z., Hapeman, C.J., Merritt, D.W., Alexander, S.T., Scudlark, J.R., and Scarborough, R., 2010. Environmental Factors Affecting the Levels of Legacy Pesticides in the Airshed of Delaware and Chesapeake Bays, USA. Environmental Toxicology and Chemistry, 29: 18931906, doi: 10.1002/etc.243.<br /> <br /> 47. Goodman, Keli J., 2010. The Effect of In-Line Lakes on Dissolved Organic Matter Dynamics in Mountain Streams. All GraduateTheses and Dissertations. Paper 702, http://digitalcommons.usu.edu/etd/702.<br /> <br /> 48. Goodman, Keli, J., Baker, M.A., Wurtsbaugh, W.A., 2010. Mountain lakes increase organic matter decomposition rates in streams. Journal of the North American Benthological Society 29(2): 521-529, doi: 10.1899/09-070.1<br /> <br /> 49. Gratz, Lynne E., 2010. Identification of Atmospheric Mercury Sources and Transport Pathways on Local and Regional Scales. A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy, University of Michigan. <br /> <br /> 50. Greenquist, M.A., Schwarz, A.K., Klopfenstein, T.J., Schacht, W.H., Erickson, G.E., Vander Pol, K.J., Luebbe, M.K., Brink, K.R., Baleseng, L.B., 2010. Effects of nitrogen fertilization and dried distillers grains supplementation: Nitrogen use efficiency. Journal of Animal Science, online publication, doi:10.2527/jas.2010-2902.<br /> <br /> 51. Grenon, Jill; Svalberg, T. Porwoll, T., Story, M., 2010. Lake and bulk sampling chemistry, NADP, and IMPROVE air quality data analysis on the Bridger-Teton National Forest (USFS Region 4). Gen. Tech. Rep. RMRS-GTR-248WWW. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 44 p.<br /> <br /> 52. Gustin, Mae, Jaffe, D., 2010. Reducing the Uncertainty in Measurement and Understanding of Mercury in the Atmosphere. Environmental Science & Technology 44(7): 2222-2227.<br /> <br /> 53. Hill, Brian, H., Elonen, C.M., Jicha, T.M., Bolgrien, D.W., Moffett, M.F., 2010. Sediment microbial enzyme activity as an indicator of nutrient limitation in the great rivers of the Upper Mississippi River basin. Biogeochemistry 97(2-3): 195-209, doi: 10.1007/s10533-009-9366-0.<br /> <br /> 54. Hill, J. Jaron, Chumchal, M.M., Drenner, R.W., Pinder, J.E., Drenner, S.M., 2010. Use of preserved museum fish to evaluate historical and current mercury contamination in fish from two rivers in Oklahoma, USA. Environmental Monitoring and Assessment 161(1-4): 509-516, doi: 10.1007/s10661-009-0764-5.<br /> <br /> 55. Hirmas, Daniel R., Amrhein, C., Graham, R.C., 2010. Spatial and process-based modeling of soil inorganic carbon storage in an arid piedmont. Geoderma 154: 486494, doi: 10.1016/j.geoderma.2009.05.005.<br /> <br /> 56. Huijnen, V., Williams, J.E., van Weele, M., van Noije, T.P.C., Krol, M.C., Dentener, F., Segers, A., Houweling, S., Peters, W., de Laat, A.T.J., Boersma, K.F., Bergamaschi, P., van Velthoven, P.F.J., Le Sager, P., Eskes, H.J., Alkemade, F., Scheele, M.P., Nedelec, P., Patz, H.-W., 2010. The global chemistry transport model TM5: description and evaluation of the tropospheric chemistry version 3.0. Geosciences Model Development Discussion 3: 10091087, www.geosci-model-dev-discuss.net/3/1009/2010/, doi:10.5194/gmdd-3-1009-2010.<br /> <br /> 57. International Maritime Organization Marine Environment Protection Committee, 2010. Designation of an Emission Control Area for Nitrogen Oxides, Sulphur Oxidesand Particulate Matter. Interpretations of and Amendments to MARPOL and Related Instruments (61st Session, Agenda Item 7, (MEPC 61/INF.9, 25 June, 2010), 57 pages.<br /> <br /> 58. Jardine, Timothy D., Bunn, S.E., Northern Australia, whither the mercury? Marine and Freshwater Research 61(4): 451463, doi:10.1071/MF09126.<br /> <br /> 59. Jin, Li, Siegel, D.I., Lautz, L.K., Mitchell, M.J., Dahms, D.E., Mayer, B., 2010. Calcite precipitation driven by the common ion effect during groundwatersurface-water mixing: A potentially common process in streams with geologic settings containing gypsum. Geological Society of America Bulletin 122 (7-8): 1027-1038, doi: 10.1130/B30011.1.<br /> <br /> 60. Jonson, J.E., Travnikov, O. (eds), 2010. Joint MSC-W/MSC-E Report EMEP/MSC-W Technical Report 1/2010: Development of the EMEP global modeling framework: Progress report. http://emep.int/publ/reports/2010/emep_technical_1_2010.pdf.<br /> <br /> 61. Kelly, Charlene N., 2010. Carbon and nitrogen cycling in watersheds of contrasting vegetation types in the Fernow Experimental Forest, West Virginia. Dissertation submitted for partial fulfillment of the Doctor of Philosophy degree, Virginia Polytechnic Institute and State University.<br /> <br /> 62. Kendall, Carol, Young, M.B., Silva, S.R., 2010. Applications of Stable Isotopes for Regional to National-Scale Water Quality and Environmental Monitoring Programs. Chapter 5 in Isoscapes: Understanding Movement, Pattern, and Process on Earth Through Isotope Mapping, J.B. West et al. (eds.), doi 10.1007/978-90-481-3354-3_5.<br /> <br /> 63. King County, 2010. Initial Assessment of Nutrient Loading to Quartermaster Harbor. Prepared by Curtis DeGasperi, Water and Land Recourses Division, Seattle Washington.<br /> <br /> 64. Kolka, Randall K., Giardina, C.P., McClure, J.D., Mayer, A., Jurgensen, M.F., 2010. Partitioning hydrologic contributions to an old-growth riparian area in the Huron Mountains of Michigan, USA. Ecohydrology. 3, 315324. doi: 10.1002/eco.112.<br /> <br /> 65. Kolker, A., Olson, M.L., Krabbenhoft, D.P., Tate, M.T., Engle, M.A., 2010. Patterns of mercury dispersion from local and regional emission sources, rural Central Wisconsin, USA. Atmospheric Chemistry & Physics Discussion 10: 1823-1846, www.atmos-chem-phys-discuss.net/10/1823/2010/.<br /> <br /> 66. Krzyzanowski, Judi, 2010. Review and Identification of Research Needs to Address Key Issues Related to Reactive Nitrogen (RN) Deposition and Eutrophication in a Canadian Context (Final Report). Prepared for: Acid Rain Task Group, Canadian Council of Ministers of the Environment, PN 1450.<br /> <br /> 67. Lambert, W.J., Aharon, P., 2010. Oxygen and hydrogen isotopes of rainfall and dripwater at DeSoto Caverns (Alabama, USA): Key to understanding past variability of moisture transport from the Gulf of Mexico. Geochimica et Cosmochimica Acta 74: 846861, doi:10.1016/j.gca.2009.10.043.<br /> <br /> 68. Landing, W.M., Caffrey, J.M., Nolek, S.D., Gosnell, K.J., Parker, W.C., 2010. Atmospheric wet deposition of mercury and other trace elements in Pensacola, Florida. Atmospheric Chemistry and Physics 10: 4867-4877, doi: 10.5194/acp-10-4867-2010.<br /> <br /> 69. Laudon, Hjalmar, Norton, S.A., 2010. Drivers and evolution of episodic acidification at the Bear Brook Watershed in Maine, USA. Environmental Monitoring and Assessment, published online, doi: 10.1007/s10661-010-1526-0.<br /> <br /> 70. Li, H., Sivapalan, M., Tian, F., Liu, D., 2010. Water and nutrient balances in a large tile-drained agricultural catchment: a distributed modeling study. Hydrological Earth Systems Science Discussion 7: 39313976, www.hydrol-earth-syst-sci-discuss.net/7/3931/2010/, doi:10.5194/hessd-7-3931-2010.<br /> <br /> 71. Liu, X.-H., Zhang, Y., Olsen, K.M., Wang, W.-X., Do, A.B., Bridgers, G.M., 2010. Responses of future air quality to emission controls over North Carolina, Part I: Model evaluation for current-year simulations. Atmospheric Environment 44(10): 2443-2456, doi:10.1016/j.atmosenv.2010.04.002.<br /> <br /> 72. Lloyd, Philip J., 2010. Changes in the wet precipitation of sodium and chloride over the continental United States, 1984-2006. Atmospheric Environment 44 (26): 3196-3206, doi: 10.1016/j.atmosenv.2010.05.016.<br /> <br /> 73. Luyssaert, S., Ciais, P., Piao, S.L., Schulze, E.D., Jung, M., Zaehle, S., Schelhaas, M.J., Reichstein, M., Churkin, G., Papale, D., Abril, G., Beer, C., Grace, J., Lous Tau, D., Matteucci, G., Magnani, F., Nabuurs, G.J., Verbeeck, H., Sulkava, M., van der Werf, G.R., Janssens, I.A., and members of the Carboeurope-IP Synthesis Team, 2010. The European carbon balance. Part 3: forests. Global Change Biology 16: 14291450, doi: 10.1111/j.1365-2486.2009.02056.x.<br /> <br /> 74. Lyman, Seth N., Gustin, M.S., Prestbo, E.M., 2010. A passive sampler for ambient gaseous oxidized mercury concentrations. Atmospheric Environment 44: 246-252.<br /> <br /> 75. Maryland, State of., 2010. Total Maximum Daily Load of Mercury for Watersheds draining to Millington Wildlife Management Area Ponds. Maryland, Department of Environment, Baltimore, MD 21230, http://www.mde.state.md.us/assets/document/Millington_WMA_Hg_081910_PCdraft.pdf.<br /> <br /> 76. Maryland, State of, 2010. Watershed Report for Biological Impairment of the Deep Creek Lake Watershed in Garrett County, Maryland: Biological Stressor Identification Analysis Results and Interpretation. Department of the Environment, July 2010, 28pp.<br /> <br /> 77. Mast, Alisa. M., Manthorne, D.J., Roth, D.A., 2010. Historical deposition of mercury and selected trace elements to high-elevation National Parks in the Western U.S. inferred from lake-sediment cores. Atmospheric Environment 44: 2577-2586.<br /> <br /> 78. McLauchlan, Kendra K., Ferguson, C.J., Wilson, I.E., Ocheltree, T.W., Craine, J.M., 2010. Thirteen decades of foliar isotopes indicate declining nitrogen availability in central North American grasslands. New Phytologist Special Issue 187 (4) 1135-1145, doi: 10.1111/j.1469-8137.2010.03322.x.<br /> <br /> 79. McMahon, Sean M., Parker, G.G., Miller, D.R., 2010. Evidence for a recent increase in forest growth. Proceedings of the National Academy of Sciences 107(8): 3611-3615, www.pnas.org/cgi/doi/10.1073/pnas.0912376107.<br /> <br /> 80. Moravec, B.G., Keller, C.K., Smith, J.L., Allen-King, R.M., Goodwin, A.J., Fairley, J.P., Larson, P.B., 2010. Oxygen-18 dynamics in precipitation and streamflow in asemi-arid agricultural watershed, Eastern Washington, USA. Hydrologic Processes 24: 446460.<br /> <br /> 81. Naik, Avani, 2010. Trace Metal Fluxes in Southwest Ohio Watersheds. A thesis submitted for the degree of Master of Science, Wright State University.<br /> <br /> 82. Navratil, Tomas, Norton, S.A., Fernandez, I.J., Nelson, S.J., 2010. Twenty-year inter-annual trends and seasonal variations in precipitation and stream water chemistry at the Bear Brook Watershed in Maine, USA. Environmental Monitoring and Assessment, online publication, 23 pp., doi: 10.1007/s10661-010-1527-z.<br /> <br /> 83. North Carolina, State of, 2010. 2006 Ambient Air Quality Report. Department of Environment and Natural Resources, Air Quality Division. <br /> <br /> 84. Norton, S.A., Fernandez, I.J., Kahl, J.S., Rustad, L.E., Navratil, T., Almquist, H., 2010. The evolution of the science of Bear Brook Watershed in Maine, USA. Environmental Monitoring and Assess 171: 321, doi: 10.1007/s10661-010-1528-y.<br /> <br /> 85. ODriscoll, Michael A., DeWalle, D.R., 2010. Seeps Regulate Stream Nitrate Concentration in a Forested Appalachian Catchment. Journal Environmental Quality 39: 420431, doi: 10.2134/jeq2009.0083.<br /> <br /> 86. Padgett, Pamela, E., 2010. The effect of ambient ozone and humidity on the performance of nylon and Teflon filters used in ambient air monitoring filterpack systems. Atmospheric Pollution Research 1: 2329.<br /> <br /> 87. Pan, Li, Lin, C.-J., Carmichael, G.R., Streets, D.G., Tang, Y., Woo, J.H., Shetty, S.K., Chu, H.-W., Ho, T.C., Friedli, H.R., Feng, X., 2010. Study of atmospheric mercury budget in East Asia using STEM-Hg modeling system. Science of The Total Environment 408(16): 3277-3291, doi: 10.1016/j.scitotenv.2010.04.039.<br /> <br /> 88. Parman, Jordan N., 2010. Climatological and elevational controls on organic and inorganic nutrients in stream waters, Boulder Creek watershed, Colorado Front Range. A Masters thesis submitted to the University of Colorado.<br /> <br /> 89. Parsons, Matthew J., Long, D.T., Yohn, S.S., 2010. Assessing the natural recovery of a lake contaminated with Hg using estimated recovery rates determined by sediment chronologies. Applied Geochemistry 25: 16761687.<br /> <br /> 90. Peters, Debra P.C., 2010. Accessible ecology: synthesis of the long, deep, and broad. Trends in Ecology & Evolution 25(10): 592-601, doi: 10.1016/j.tree.2010.07.005.<br /> <br /> 91. Ponette-González, A. G., Weathers, K. C., Curran, L. M., 2010. Tropical land-cover change alters biogeochemical inputs to ecosystems in a Mexican montane landscape. Ecological Applications 20:18201837, doi:10.1890/09-1125.1.<br /> <br /> 92. Pouyat, Richard V., Weathers, K.C., Hauber, R., Lovett, G.M., Bartuska, A., Christenson, L., Davis, J.L.D., Findlay, S.E.G., Menninger, H., Rosi-Marshall, E., Stine, P., Lymn, N., 2010. The role of federal agencies in the application of scientific knowledge. Frontiers in Ecology and the Environment 8: 322328. doi:10.1890/090180.<br /> <br /> 93. Prospero, J. M., Landing, W. M., Schulz, M., 2010. African dust deposition to Florida: Temporal and spatial variability and comparisons to models. Journal of Geophysical Research 115: D13304, doi:10.1029/2009JD012773.<br /> <br /> 94. Reese, Emyrei, 2010. Comparison of Agricultural Area Source Ammonia Gas Concentration and Flux Measurements. All Graduate Theses and Dissertations. Paper 543, http://digitalcommons.usu.edu/etd/543.<br /> <br /> 95. Ren, X., Gao, H., Zhou, X., Crounse, J.D., Wennberg, P.O., Browne, E.C., LaFranchi, B.W., Cohen, R.C., McKay, M., Goldstein, A.H., Mao, J., 2010. Measurement of atmospheric nitrous acid at Blodgett Forest during BEARPEX2007. Atmospheric Chemistry and Physics Discussion 10: 73837419, www.atmos-chem-phys-discuss.net/10/7383/2010/. <br /> <br /> 96. Richardson, Barbara, Richardson, M., González, G., Shiels, A., Srivastava, D., 2010. A Canopy Trimming Experiment in Puerto Rico: The Response of Litter Invertebrate Communities to Canopy Loss and Debris Deposition in a Tropical Forest Subject to Hurricanes. Ecosystems 13(2): 286-301, doi: 10.1007/s10021-010-9317-6.<br /> <br /> 97. Risch, M.R., Baker, N.T., Fowler, K.K., Egler, A.L., Lampe, D.C., 2010. Mercury in Indiana Watersheds: Retrospective for 2001-2006. US Geological Survey Professional Paper 1780, 66pp.<br /> <br /> 98. Rothenberg, Sarah E., McKee, L., Gilbreath, A., Yee, D., Conner, M., Fu, X., 2010. Wet deposition of mercury within the vicinity of a cement plant before and during cement plant maintenance. Atmospheric Environment 44(10): 1255-1262, doi: 10.1016/j.atmosenv.2009.12.033.<br /> <br /> 99. Rygiwicz, Paul T., Monleon, V.J., Ingham, E.R., Martin, K.J., Johnson, M.G., 2010. Soil life in reconstructed ecosystems: Initial soil food web responses after rebuilding a forest soil profile for a climate change experiment. Applied Soil Ecology 45: 2638.<br /> <br /> 100. Sahu, S. K., Gelfand, A. E., Holland, D. M., 2010. Fusing point and areal level spacetime data with application to wet deposition. Journal of the Royal Statistical Society Series C (Applied Statistics) 59(1): 77-103, doi: 10.1111/j.1467-9876.2009.00685.x. <br /> <br /> 101. Sanei, H., Goodarzi, F., Outridge, P.M., 2010. Spatial distribution of mercury and other trace elements in recent lake sediments from central Alberta, Canada: An assessment of the regional impact of coal-fired power plants. International Journal of Coal Geology 82(1-2) 105-115, ISSN doi: 10.1016/j.coal.2010.01.010.<br /> <br /> 102. Sanei, H., Outridge, P.M., Goodarzi, F., Wang, F., Armstrong, D., Warren, K., Fishback, L., 2010. Wet deposition mercury fluxes in the Canadian sub-Arctic and southern Alberta, measured using an automated precipitation collector adapted to cold regions. Atmospheric Environment 44(13): 1672-1681, doi: 10.1016/j.atmosenv.2010.01.030.<br /> <br /> 103. Schultheis, E.H., Hopfensperger, K.N., Brenner, J.C. 2010. Potential Impacts of Climate Change on Sphagnum Bogs of the Southern Appalachian Mountains. Natural Areas Journal 30(4): 417-424. 2010, doi: 10.3375/043.030.0407. <br /> <br /> 104. Seaver, George A., 2010. Estuary response to an abrupt, large increase in groundwater nitrate input. Applied Geochemistry 25: 14531460, doi:10.1016/j.apgeochem.2010.07.003.<br /> <br /> 105. Sherwood, Owen A., Lapointe, B.E., Risk, M.J., Jamieson, R.E., 2010. Nitrogen Isotopic Records of Terrestrial Pollution Encoded in Floridian and Bahamian Gorgonian Corals. Environmental Science & Technology 2010 44(3): 874-880.<br /> <br /> 106. Sigleo, Anne C., Frick, W.E., Prieto, L., 2010. Red Alder (Alnus rubra) Distribution Influences Nitrate Discharge to Coastal Estuaries: Comparison of Two Oregon Watersheds. Northwest Science 84(4): 336-350, doi: 10.3955/046.084.0403.<br /> <br /> 107. Skogen, K.A., Holsinger, K.E., Cardon, Z.G., 2010. Nitrogen deposition, competition and the decline of a regionally threatened legume, Desmodium cuspidatum. Oecologia, online publication, doi: 10.1007/s00442-010-1818-7. <br /> <br /> 108. Springsteen, Anna, Loya, W., Liebig, M., Hendrickson, J., 2010. Soil carbon and nitrogen across a chronosequence of woody plant expansion in North Dakota. Plant Soil 328: 369379, doi 10.1007/s11104-009-0117-8.<br /> <br /> 109. Sprovieri, E., Pirrone, N., Ebinghaus, R., Kock H., Dommergue, A., 2010. Worldwide atmospheric mercury measurements: a review and synthesis of spatial and temporal trends. Atmospheric Chemistry and Physics Discussion 10: 12611307, www.atmos-chem-phys-discuss.net/10/1261/2010/.<br /> <br /> 110. State of North Carolina, 2010. 2005 Ambient Air Quality Report. Department of Environmental and Natural Resources, Division of Air Quality, April 2010.<br /> <br /> 111. Stevens, Carly J., Tilman, D., 2010. Point Source Ammonia Emissions are Having a Detrimental Impact On Prairie Vegetation. Water, Air, & Soil Pollution 211 (1-4): 435-441, doi: 10.1007/s11270-009-0312-5.<br /> <br /> 112. Stevenson, B.A., Kelly, E.F., McDonald, E.V., Busacca, A.J., Welker, J.M., 2010. Oxygen isotope ratios in Holocene carbonates across a climatic gradient, eastern Washington State, USA: Evidence for seasonal effects on pedogenic mineral isotopic composition. The Holocene Online, doi:10.1177/0959683609356588.<br /> <br /> 113. Stoleson, Scott H., King, D.I., Tomosy, M., 2010. Avian research on U.S. Forest Service Experimental Forests and Ranges: Emergent themes, opportunities, and challenges, Forest Ecology and Management, In Press, Corrected Proof, doi: 10.1016/j.foreco.2010.07.038, http://www.sciencedirect.com/science/article/B6T6X-50WXY57-3/2/99da408e75b1ca65e6b6571d162ed9a0.<br /> <br /> 114. Stupple, Geoffrey, 2010. Air Mercury Speciation, Foliar Uptake, and Wash-Off along an Urban-Rural Gradient. A thesis submitted for the degree of Masters of Science, University of Toronto.<br /> <br /> 115. Sunderland, Elsie M., Dalziel, J., Heyes, A., Branfireun, B., Krabbenhoft, D.P., Gobas, F.A.P.C., 2010. Response of a Macrotidal Estuary to Changes in Anthropogenic Mercury Loading between 1850 and 2000. Environmental Science and Technology 44: 16981704.<br /> <br /> 116. Tabatchnick, M. D., 2010. Mercury Speciation in Temperate Tree Foliage, A Masters thesis for the degree of Master of Science, Wright State University.<br /> <br /> 117. Thornton, Joel A., Kercher, J.P., Riedel, T.P., Wagner, N.L., Cozic, J., Holloway, J.S., Dube, W.P., Wolfe, G.M., Quinn, P.K., Middlebrook, A.M., Alexander, B., Brown, S.S., 2010. A large atomic chlorine source inferred from mid-continental reactive nitrogen chemistry. Nature 464: 271-274, doi:10.1038/nature08905.<br /> <br /> 118. Tonnessen, K.A., 2010. Protecting Wilderness Air Quality in the United States. In: McCool, David N, Borrie, S.F., OLoughlin, W.T. (cmpls.), Wilderness science in a time of change conferenceVolume 5: Wilderness ecosystems, threats, and management; 1999 May 2327; Missoula, MT. Proceedings RMRS-P-15-VOL-5. Ogden, UT: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station.<br /> <br /> 119. Tronstad, Lusha M., Hall, R.O., Koel, T.M., Gerow, K.G., 2010. Introduced Lake Trout Produced a Four-Level Trophic Cascade in Yellowstone Lake. Transactions of the American Fisheries Society 139: 1536-1550, doi: 10.1577/T09-151.1.<br /> <br /> 120. Troxler, Tiffany G., Childers, D.L., 2010. Biogeochemical Contributions of Tree Islands to Everglades Wetland Landscape Nitrogen Cycling During Seasonal Inundation. Ecosystems 13: 7589, doi: 10.1007/s10021-009-9302-0.<br /> <br /> 121. Tucker, William A., 2010. Final Report: Wekiva River Basin Nitrate Sourcing Study Prepared for: St. Johns River Water Management District, Palatka, Florida 32177 and Florida Department of Environmental Protection. <br /> <br /> 122. Ullman, William J., Scudlark, J.R., Volk, J.A., 2010. Standard Operating Procedure for the Calculation of N and P Deposition from the Atmosphere to Waters of Delawares Inland Bays. Report for the Delaware Department of Natural Resources and Environmental Control, Dover DE 19901, http://www.inlandbays.org/cib_pm/pdfs/uploads/CIB_Atmos_Dep_SOP_FINAL.pdf.<br /> <br /> 123. United States Department of the Interior, Bureau of Land Management, 2010. Competitive Oil and Gas Lease Sales (WY-080-EA10-22), August and November, 2010. Newcastle Field Office, Newcastle, Wyoming.<br /> <br /> 124. Vachon, R.W., Welker, J.M., White, J.W.C., Vaughn, B.H., 2010. Monthly precipitation isoscapes (d18O) of the United States: Connections with surface temperatures, moisture source conditions, and air mass trajectories. Journal of Geophysical Research 115: D21126, doi:10.1029/2010JD014105.<br /> <br /> 125. Vadeboncoeur, Matthew A., 2010. Meta-analysis of fertilization experiments indicates multiple limiting nutrients in northeastern deciduous forests. Canadian Journal of Forest Research 40: 1766-1780.<br /> <br /> 126. Van Diepen, Linda T.A., Lilleskov, E.A., Pregitzer, K.S., Miller, R. M., 2010. Simulated Nitrogen Deposition Causes a Decline of Intra- and Extraradical Abundance of Arbuscular Mycorrhizal Fungi and Changes in Microbial Community Structure in Northern Hardwood Forests. Ecosystems 13(5): 683-695, doi: 10.1007/s10021-010-9347-0.<br /> <br /> 127. Van Furl, Chad, Colman, J.A., Bothner, M.H., 2010. Mercury Sources to Lake Ozette and Lake Dickey: Highly Contaminated Remote Coastal Lakes, Washington State, USA. Water, Air & Soil Pollution 208:275286, doi: 10.1007/s11270-009-0165-y.<br /> <br /> 128. Van Riper, Laura C., Larson, D.L., Larson, J.L., 2010. Nitrogen-limitation and invasive sweetclover impacts vary between two Great Plains plant communities. Biological Invasions 12(8): 2735-2749, doi: 10.1007/s10530-009-9678-y.<br /> <br /> 129. Vidon, P., Cuadra, P.E., 2010. Impact of precipitation characteristics on soil hydrology in tile-drained landscapes. Hydrological Processes 24, 18211833.<br /> <br /> 130. Vijayaraghavan, K., Herr, J., Chen, S.-Y., Knipping, E., 2010. Linkage between an advanced air quality model and a mechanistic watershed model. Geosciences Model Development Discussion 3: 15031548, doi:10.5194/gmdd-3-1503-2010.<br /> <br /> 131. Walters, David M., Blocksom, K.A., Lazorchak, J.M., Jicha, T., Angradi, T.R., Bolgrien, D.W., 2010. Mercury Contamination in Fish in Midcontinent Great Rivers of the United States: Importance of Species Traits and Environmental Factors. Environmental Science & Technology 44(8): 2947-2953.<br /> <br /> 132. Ward, Darren M., Nislow, K.H., Chen, C.Y., Foltt, C.L., 2010. Rapid, Efficient Growth Reduces Mercury Concentrations in Stream-Dwelling Atlantic Salmon. Transactions of the American Fisheries Society 139: 110, doi: 10.1577/T09-032.1.<br /> <br /> 133. Weand, Matthew P., Arthur, M.A., Lovett, G.M., McCulley, R.L., Weathers, K.C., 2010. Effects of tree species and N additions on forest floor microbial communities and extracellular enzyme activities. Soil Biology & Biochemistry 42: 2161-2173.<br /> <br /> 134. Wetherbee, Gregory A., Shaw, M.J., Latysh, N.E., Lehmann, C.M.B., Rothert, J.E., 2010. Comparison of precipitation chemistry measurements obtained by the Canadian Air and Precipitation Monitoring Network and National Atmospheric Deposition Program for the period 19952004. Environmental Monitoring and Assessment 164: 111132, doi: 10.1007/s10661-009-0879-8. <br /> <br /> 135. Winder, V.L., Emslie, S.D., 2010. Mercury in breeding and wintering Nelsons Sparrows (Ammodramus nelsoni). Ecotoxicology (online), doi: 10.1007/s10646-010-0573-1.<br /> <br /> 136. Williams, Shannon F., 2010. Spatial Distribution of Fluoride Concentration in Goathill North Rock Pile, Questa Molybdenum Mine, Questa, New Mexico. A Masters Thesis submitted for the degree of Master of Science in Hydrology, University of Nevada, Reno. <br /> <br /> 137. Wyn, Brianna, Kidd, K.A., Burgess, N.M., Curry, R.A., Munkittrick, K.R., 2010. Increasing Mercury in Yellow Perch at a Hotspot in Atlantic Canada, Kejimkujik National Park. Environmental Science and Technology 44 (23): 91769181, doi: 10.1021/es1018114.<br /> <br /> 138. Yi, Li, Xiaolan, Y., Hongbing, C., Weili, L., Jie, T., Shufeng, W., 2010. Chemical characteristics of precipitation at three Chinese regional background stations from 2006 to 2007. Atmospheric Research 96: 173183, doi:10.1016/j.atmosres.2009.12.011.<br /> <br /> 139. Young, Caitlin R., 2010. Extent of Denitrification in Northport Groundwater. A Masters Thesis for the degree of Master of Science Stony Brook University.<br /> <br /> 140. Zhang, Yang, Wen, X.-Y., Jang, C.J., 2010. Simulating chemistry-aerosol-cloud-radiation-climate feedbacks over the continental U.S. using the online-coupled Weather Research Forecasting Model with chemistry (WRF/Chem). Atmospheric Environment 44: 3568-3582.<br /> <br /> 141. Zhao, S.Q., Liu, S., Li, Z., Sohl, T.L., 2010. A spatial resolution threshold of land cover in estimating terrestrial carbon sequestration in four counties in Georgia and Alabama, USA. Biogeosciences, 7: 7180. <br />

Impact Statements

1. As a National Research Support Project, the NADPs most important impacts are the research reports and journal articles that are produced using our data and products. Here, several articles are summarized that are most useful for agriculture and to the USDA. From January through December 2010, we identified 145 journal articles and reports that used NADP data or maps specifically in their research, modeling applications, or for comparison. These articles are included in our online database of NADP-supported publications. Brief summaries of several articles are given as specific examples of the research supported by the NRSP-3.
2. Skogen et al. investigated the impact that anthropogenic and agricultural nitrogen deposition could have on mid-latitude forests and native species (e.g., legumes). They estimated that N deposition is having a detrimental effect on these legumes through increased biomass in other species that out-compete them. As other species more strongly assimilate N, legumes become more dependent on other limited nitrogen sources.
3. Van Riper et al. investigated the potential for much higher nitrogen fixation rates in prairie soils with the presence of non-native sweetclover, another legume now common in the upper Midwest. Increased species presence should increase nitrogen fixation and force species changes. Increases in Halogeton glomeratus (a restricted noxious weed) abundance was noted. NADP data were used to estimate nitrogen addition at multiple field sites.
4. Van Diepen et al. simulated long-term nitrogen deposition into northern forests and investigated ecosystem changes in the in situ fungi and the microbial community, finding serious decreases in biomass with increased deposition. NADP information provided typical deposition at all their field sites in upper and lower Michigan.
5. Stevens and Tillman investigated the impact on native prairie grasses of point source ammonia emissions from Midwest animal operations. Among their findings was that soil pH, ammonium, and nitrate concentration gradients were present with distance, species richness decreased toward the sites, and above ground biomass was higher with increased NH4 deposition. NADP data provided baseline values for deposition at the several animal feedlots used for the study.
6. Di Vittorio et al. developed and optimized the agricultural and ecosystem numerical model Agro-BGC (Biogeochemical Cycles) to now include C4 perennial grass function, along with fruit growth, optional annual seeding, N fertilization, harvest, fire, and different irrigation strategies. Results were compared to crop data from IL SAES. For the model, NADP data are used as input of nitrogen deposition to all agricultural lands.
7. Li et al. built a numerical model describing the coupled water runoff and chemical movement from a tile-drained agricultural region of Illinois. The model suggests that annual runoff volume and nitrogen discharge are principally from tile, with a net loss of nitrogen during wet years (and vice versa). Phosphorus storage is not affected by wet and dry years. NADP Nitrogen and Phosphorus information was used as inputs to the model and to check model performance.
8. Vidon and Cuadra also investigated the hydrology of tiled agriculture systems. They investigated and modeled different types of flow through soil and drainage characteristics, along with chemical composition in drainage waters. NADP data were used to define the problem and provide the chemical composition of deposition water.
9. This same type of model building and analysis was conducted by Dayyani et al. in Eastern Canada with the DRAIN-WARMF model. They were able to adequately model hydraulic response and nitrate losses. The authors used NADP data as chemical and hydraulic inputs to the model.
10. Reese used passive and active techniques to determine ammonia emissions from a variety of agriculture areas sources, including overall dairy emission rates and a comparison of measurement techniques. He used NAPD data to look for spatial correlations between ammonia wet deposition and animal operations.
11. Beavers et al. investigated the burden and loss rates of phosphorus (P) from poultry-litter amended soils in the Southeast, finding increasing P levels over time, with the majority of the P still in place after three years. NADP phosphorus information and observations were used in their model to estimate atmospheric input of P to the soils over the study period.
12. Bormann et al. studied the effect of ion losses in cropping systems (corn and alfalfa), specifically studying the method of using simulated rainfall versus actual rainfall (as provided by NADP) to determine leaching. They concluded that simulated rainfall does have significant differences from real rainfall. Here, NADP provided regional values of Na, K, Mg, Ca deposition, rainfall samples, and information on orthophosphate ions.
13. Grenon et al. used NAPD data extensively to look for deposition trends in the Bridger-Teton National Forest, finding decreasing deposition of sulfate, Na, Mg, and Cl, while finding increasing trends in ammonium and inorganic nitrogen. These trends should have an impact on the forest ecosystem and surrounding areas.
14. The USDA Forest Service produced a report that reviewed the scientific resources at the 77 experimental forests and ranges of the U.S. This document describes each research site, its history, climate, vegetation, soils, databases, and research products. NADP is represented at several forests, including Marcell in Minnesota where several of the Networks oldest NADP sites are located.
15. Greenquist et al. published work in the Journal of Animal Science concerning nitrogen use efficiency in steers with substitute feeds. They found some improvements in efficiency using dried distillers grain as feed. NAPD information on deposition rates and nitrogen amounts was used as input to their models.

Back to top

Report Information

Participants

A list of meeting participants from our Fall Meeting and Scientific Symposium can be downloaded from our website (http://nadp.isws.illinois.edu/committees/minutes.aspx).

Brief Summary of Minutes

All meeting minutes from our 2011 Spring Meeting (Business Meeting) and our 2010 Fall Meeting and Scientific Symposium are available on our website (http://nadp.isws.illinois.edu/committees/minutes.aspx).

Accomplishments

The NRSP-3 provides a framework for cooperation among State Agricultural Experiment Stations (SAES), the U.S. Department of Agriculture, and other governmental and nongovernmental organizations that support the National Atmospheric Deposition Program (NADP). The NADP provides quality-assured data and information on the exposure of managed and natural ecosystems and cultural resources to acidic compounds, nutrients, base cations, and mercury in precipitation and through dry deposition of these same compounds. NADP data support informed decisions on air quality issues related to precipitation chemistry.<br /> <br /> Specifically, researchers use NADP data to investigate the impacts of atmospheric deposition on the productivity of managed and natural ecosystems; the chemistry of estuarine, surface, and ground waters; and the biodiversity in forests, shrubs, grasslands, deserts, and alpine vegetation. These research activities address environmental stewardship, one of the Experiment Station Sections research challenges. Researchers also use NADP Mercury Deposition Network data to examine the role of atmospheric deposition in affecting the mercury content of fish, and to better understand the link between environmental and dietary mercury and human health. This fits with another research priority of relationship of food to human health.<br /> <br /> The NADP operates three precipitation chemistry networks: the National Trends Network (NTN), the Atmospheric Integrated Research Monitoring Network (AIRMoN), and the Mercury Deposition Network (MDN). At the end of September, 2011, 250 NTN stations were collecting one-week precipitation samples in 48 states, Puerto Rico, the Virgin Islands, and Quebec Province, Canada. The NTN provides the only long-term nationwide record of basic ion wet deposition in the United States. Complementing the NTN is the 7-site AIRMoN and the 106-site MDN. Data from daily precipitation samples collected at AIRMoN sites support continued research of atmospheric transport and removal of air pollutants and development of computer simulations of these processes. The MDN offers the only long-term and routine measurements of mercury in North American precipitation. These data are used to quantify mercury deposition to water bodies that have fish and wildlife consumption advisories due to this toxic chemical. In 2008, every state and 10 Canadian provinces listed advisories warning people to limit fish consumption due to high mercury levels. Coastal advisories are also in place for Atlantic waters from Maine to Rhode Island, from North Carolina to Florida, for the entire U.S. Gulf Coast, and for coastal Hawaii and Alaska.<br /> <br /> The NADP operates two newer gaseous atmospheric chemistry networks: the Atmospheric Mercury Network (AMNet) and the Ammonia Monitoring Network (AMoN), which is NADPs newest network. In each case, the network goal is to provide atmospheric concentrations of particular gases and then to estimate the rate of dry deposition (without precipitation) of the gas. In many cases, dry deposition of the gas could far exceed the wet deposition of the same compound. <br /> <br /> At the end of September 2011, 21 AMNet sites were collecting five-minute estimates of gaseous elemental mercury and two-hourly average concentrations of gaseous oxidized mercury and particulate bound mercury. The AMNet provides the only long-term region-wide record of basic mercury concentrations in the United States. <br /> <br /> The AMoN has 52 sites as of September 2011, where two-week averages of atmospheric ammonia gas are being collected with passive devices. This low-cost network is designed to provide long-running estimates of ammonia in the atmosphere. This gas and data are particularly important to agriculture since many sources of ammonia are agricultural in nature. Data from both gaseous networks support continued research of atmospheric transport and removal of air pollutants and development of computer simulations of these processes.<br /> <br /> <br /> <br /> Short-term Outcomes and Outputs.<br /> <br /> Samples Collected. NADPs principal objective and accomplishment/outcome is the collection and analysis of samples for precipitation chemistry. Briefly, the NADP processed a total of 13,058 weekly precipitation samples from the NTN. These include 12,814 samples and 244 quality assurance samples. The chemical analyses include observations of 10 different analyte concentrations and precipitation volume, which allow for calculation of deposition flux for each analyte. These same data are collected daily (i.e., every day with measurable precipitation) from the AIRMoN network. For the year, AIRMoN collected and processed 1,163 precipitation samples, including 113 QA samples. The MDN collected and processed 5,762 weekly mercury-in-precipitation samples during the year, including 131 quality assurance samples. The AMoN collected and quality assured 1,408 ammonia samples during the year. The AMNet collected, quality assured, and produced 39,000 hourly and two-hourly averages.<br /> <br /> NADP Data. Our second most important accomplishment/outcome is making data available to all for the support of continued research. Scientists, policymakers, educators, students, and others are encouraged to access data at no charge from the NADP website (http://nadp.isws.illinois.edu). This site offers online retrieval of individual data points, seasonal and annual averages, trend plots, concentration and deposition maps, reports, manuals, and other data and information about the program. As of today, 2010 calendar year data are complete and online, with data through June of 2011 available online. Website usage statistics provide evidence that our data are being used. During FY2011, website usage continued to grow. There are now more than 39,000 registered users with over 356,000 independent user sessions. There were almost 27,000 data downloads from the site. The site received more than 1.505 million webpage hits, and our data maps were viewed approximately 124,000 times. Information about users is collected, and the user types include about 33 percent from federal and state agencies, 33 percent from universities, 20 percent from K-to-12 schools, and 14 percent from other organizations. The NADP website has registered users from more than 150 countries across the globe. These statistics demonstrate that NADP continues to be relevant to both the scientific and educational communities, and to attract new users.<br /> <br /> Map Summary. During FY11, annual maps of atmospheric pollutants, concentrations, and depositions were developed for 2010 calendar year measurements. These maps are used widely for a number of reasons, and constitute one of the major products of the network. Individual maps are filed by network, year, and constituent (see examples at http://nadp.isws.illinois.edu/data/annualiso.aspx). Individual maps are compiled into annual Map Summary reports (http://nadp.isws.illinois.edu/lib/dataReports.aspx). We also completed the distribution of 2,000 printed 2009 Map Summaries, and printed and began distributing 2,000 of the 2010 Map Summaries in September. Currently, the 2010 maps data are finalized, and the 2010 Map Summary is available for all to download. <br /> <br /> Scientific Meeting (Fall 2010). At the end of each federal year, a scientific meeting is held that showcases some of the latest deposition research that occurred during the year. During FY10 (Lake Tahoe, California, Oct. 19-21, 2010), the meeting focused on Networking the Networks, with a goal of bringing networks together so that collaboration and efficiencies could be generated. The meeting attracted 152 registered participants with three keynote speakers, six speaking sessions, and one poster session. Sessions included Soil Networks with direct agriculture topics, and other sessions detailing biological, atmospheric, and hydrologic monitoring networks and systems. All presentations, posters, and meeting proceedings are available on the NADP website (http://nadp.isws.illinois.edu/conf/2010/).<br /> <br /> Scientific Meeting (Fall 2011, FY12). The next scientific meeting was held on October 25 to 28, 2011 in Providence, Rhode Island. It was entitled NADP at the Nexus: Cross System Connections. All meeting information, participants, presentations, and other details are available online. See http://nadp.isws.illinois.edu/conf/2011/ for more information and details. <br /> <br /> These basic activities fulfilled the project objectives: (1) coordination of three networks; (2) quality assurance to ensure consistency; and (3) analytical, site support, and data validation services for the sites supported directly through this agreement.<br /> <br /> Network Operation Notes. The NADP continues to convert our precipitation gages to an all-digital network, originating with a Technical Committee decision in 2006 (http://nadp.isws.illinois.edu/newissues/newgages/newequip.aspx). Currently, the network is well on its way to completing this goal. During the summer, our largest site supporter (USGS, with 70+ sites) purchased and installed (most sites) new digital raingages for its sites, along with new precipitation collectors. With these summer additions, the networks have an approximately 80% digital precipitation record.<br /> <br /> Further, an independent committee conducted an external review of the management practices of the Program Office (management team) during the summer of 2010. Reports of the review were provided at the Fall Meeting 2010, with a formal response and questions provided to the Executive Committee meeting (Pensacola, May 2011). During the Summer (FY11), the Central Analytical Laboratory (chemistry for NTN and AIRMoN networks) was reviewed and reports are forthcoming.<br /> <br /> Other Notes. In November 2004, the U.S. Department of Agriculture (USDA) Animal and Plant Health Inspection Service issued the first report of Phakopsora pachyrhizi, commonly known as Asian Soybean Rust (ASR), in the continental U.S. ASR is an obligate fungal parasite that can cause significant losses in soybean and other leguminous crops. From infected plants, ASR spreads through the aerial release and dispersal of spores. These airborne spores can be scavenged in and below clouds and deposited by rain on uninfected host plants hundreds of kilometers from an existing infection. During the 2010 growing season, NADP again partnered with the USDA Cereal Disease Laboratory (CDL) to look for ASR spores in NTN samples (5th year). With partial support from the Agricultural Research Service, weekly samples from 80 eastern U.S. NTN sites were selected and are undergoing study. Additionally, a new wheat rust investigation, also with CDL, began in November 2009. This investigation occurred at 44 Southern U.S. sites and weekly precipitation samples for several strains of winter wheat rust. Results should be available soon. An investigation occurred during the summer with an intern to locate soybean fields with remote sensing, and further to locate soybean rust with any accuracy. A journal article is pending.<br /> The presence of ammonia gas in the atmosphere and its association with agricultural operations has become a very important topic of discussion, and NADP is continuing with an ammonia monitoring network across the central part of the U.S. and Canada. This network was recently accepted as a full network within the NADP system, with a stated goal to develop, deploy, and operate a cost-efficient passive sampling network for basic ammonia gas concentrations. The network includes a quality assurance program to document the accuracy of passive samplers. Following NADP methods, the resulting quality-assured concentrations are now routinely being reported (see http://nadp.isws.illinois.edu/nh3net/). This network has numerous implications for agriculture, including directly addressing Challenge Area #2 in The Science Roadmap for Agriculture.<br /> The NADP, with support from USGS, worked on its ability to capture the analyte bromine in its NTN samples. Bromide is released into the environment via natural and anthropogenic processes, including agricultural fumigants and flame-retardants. Methyl bromide is classified as an ozone-depleting substance, and its use is strictly regulated and monitored by the U.S. EPA. During FY11, regular collection and reporting of this analyte was initiated, and is now a regularly reported analyte in NTN and AIRMoN networks.<br /> <br /> Scientists at the U.S. Environmental Protection Agency supported research at the NADPs Central Analytical Laboratory to determine whether organic nitrogen deposition can be measured reliably and accurately in weekly NTN samples. Preliminary results from these tests indicate a seasonal trend in organic nitrogen concentrations. Furthermore, these concentrations may account for as much as one-third of total nitrogen deposition. A pending journal article is currently at the submission stage and further action by NADP is forthcoming.<br /> The NRSP-3 continues to enhance our website to better serve our members and data users. Additionally, a new database technician was hired specifically to increase our ability to handle increasing levels of data (new networks, digital precipitation data).<br /> <br /> During the 2011 calendar year, 172 journal articles and reports were generated using the NADP data in some form. These are listed in the Publications section. This is again evidence that NADP is producing data that are both valuable and useful.<br /> <br /> <br /> <br /> <br /> Milestones.<br /> <br /> 1. As of the beginning of FY11, approximately 400,000 observations of precipitation chemistry are archived by the NADP (NTN and AIRMoN). More importantly, all of these remain available in our database, and are comparable over the years for research.<br /> <br /> 2. At the NADP Fall 2010 Meeting and Scientific Symposium, the technical sub-committees voted to approve the Ammonia Monitoring Network (AMoN) as an official NADP network. This is the fifth network of the NADP in our 33-year history. This network has operated as an NADP special study since 2008. The focus of AMoN is the measurement of atmospheric ammonia concentrations across North America. These data will be used to model dry deposition of mercury to the environment. AMoN has grown tremendously in the past year, in part due to the importance of the sampling information, and in part due to the low cost and simple approach taken by the network (passive sampling). Currently, AMoN has 52 sites. More information about AMoN can be found at http://nadp.sws.uiuc.edu/amon/. Data are currently being reported and are available for this network. <br />

Publications

Include 172 publications used NADP data or resulted from NRSP-3 activities in 2011 . A publically available online database that lists citations using NADP data is accessible at: http://nadp.isws.illinois.edu/lib/bibsearch.asp.<br /> <br /> <br /> <br /> 1. Aishlin, P., McNamara, J.P., 2011. Bedrock infiltration and mountain block recharge accounting using chloride mass balance. Hydrological J. 25:1934-1948, doi:10.1002/hyp.7950.<br /> <br /> 2. Aitkenhead-Peterson, J.A., Nahar, N., Harclerode, C.L., Stanley, N.C., 2011. Effect of urbanization on surface water chemistry in south-central Texas. Urban Ecosyst. 14: 195-210, doi:10.1007/s11252-010-0147-2.<br /> <br /> 3. Aitkenhead-Peterson, J.A., Dvorak, B.D., Volder, A., Stanley, N.C., 2011. Chemistry of growth medium and leachate from green roof systems in south-central Texas. Urban Ecosyst. 14: 17-33, doi:10.1007/s11252-010-0137-4.<br /> <br /> 4. Allen, R., Myles, L., Heuer, M.W., 2011. Ambient ammonia in terrestrial ecosystems: A comparative study in the Tennessee Valley, USA. Science of the Total Environ. 409: 27682772.<br /> <br /> 5. Allen, D.J., Pickering, K.E., Pinder, R.W., Henderson, B.H., Appel, K.W., Prados, A., 2011. Impact of lightning-NO on eastern United States photochemistry during the summer of 2006 as determined using the CMAQ model. Atmos. Chem. Phys. Discuss. 11: 17699-17757, doi:10.5194/acpd-11-17699-2011.<br /> <br /> 6. Amos, H.M., Jacob, D.J., Holmes, C.D., Fisher, J.A., Wang, Q., Yantosca, R.M., Corbitt, E.S., Galarneau, E., Rutter, A.P., Gustin, M.S., Steffen, A., Schauer, J.J., Graydon, J.A., St. Louis, V.L., Talbot, R.W., Edgerton, E.S., Sunderland, E.M., 2011. Gas-particle partitioning of atmospheric Hg(II) and its effect on global mercury deposition. Atmos. Chem. Phys. Discuss. 11: 29441-29477, doi:10.5194/acpd-11-29441-2011.<br /> <br /> 7. Appel, K.W., Foley, K.M., Bash, J.O., Pinder, R.W., Dennis, R.L., Allen, D.J., Pickering, K., 2011. A multi-resolution assessment of the Community Multiscale Air Quality (CMAQ) model v4.7 wet deposition estimates for 20022006. Geosci. Model Dev. 4: 357371, doi:10.5194/gmd-4-357-2011.<br /> <br /> 8. Appel, K.W., Gilliam, R.C., Davis, N., Zubrow, A., Howard, S.C., 2011. Overview of the atmospheric model evaluation tool (AMET) v1.1 for evaluating meteorological and air quality models. Environ. Modelling & Software 26: 4340-4443.<br /> <br /> 9. Avila-Segura, M., Barak, P., Jedtcke, J.L., Posner, J.L., 2011. Nutrient and alkalinity removal by corn grain, stover and cob harvest in Upper Midwest USA. Biomass and Bioenergy 35: 1190-1195. <br /> <br /> 10. Baron, J.S., Driscoll, C.T., Stoddard, J.L., Richer, E.E., 2011. Empirical critical loads of atmospheric nitrogen deposition for nutrient enrichment and acidification of sensitive U.S. lakes. BioScience 61: 602-613.<br /> <br /> 11. Belovsky, G.E., Stephens, D., Perschon, C., Birdsey, P., Paul, D., Naftz, D., Baskin, R., Larson, C., Mellison, C., Luft, J., Mosley, R., Mahon, H., Van Leeuwen, J., Allen, D.V., 2011. The Great Salt Lake ecosystem (Utah, USA): Long-term data and a structural equation approach. Ecosphere 2(33), 44pp., doi:10.1890/ES10-00091.1.<br /> <br /> 12. Benson, L.V., 2011. Factors controlling pre-Columbian and early historic maize productivity in the American Southwest, Part 1: The Southern Colorado Plateau and Rio Grande Regions. J. Arch. Method Theory 18: 1-60, doi:10.1007/s10816-010-9082-z.<br /> <br /> 13. Brown, S.G., Lee, T., Norris, G.A., Roberts, P.T., Collett, Jr., J.L., Paatero, P., Worsnop, D.R., 2011. Receptor modeling of near-roadway aerosol mass spectrometer data in Las Vegas, Nevada, with EPA PMF. Atmos. Chem. Phys. Discuss. 11: 22909-22950, doi:10.5194/acpd-11-22909-2011.<br /> <br /> 14. Caffrey, J.M., Landing, W.M., Nolek, S.D., Gosnell, K.J., Bagui, S.S., Bagui, S.C., 2011. Atmospheric deposition of mercury and major ions to the Pensacola (Florida) watershed: Spatial, seasonal, and inter-annual variability. Atmos. Chem. Phys. 10: 5425-5434, doi:10.5194/acp-10-5425-2010.<br /> <br /> 15. Cai, M., Schwartz, J.S., Robinson, R.B., Moore, S.E., Kulp, M.A., 2011. Long-term annual and seasonal patterns of acidic deposition and stream water quality in a Great Smoky Mountains high-elevation watershed. Water Air Soil Poll. 219: 547-562, doi:10.1007/s11270-010-0727-z.<br /> <br /> 16. Chalmers, A., Argue, D., Gay, D.A., Brigham, M., Lorenz, D, Schmitt, C., 2011. Mercury trends in fish tissue from streams and lakes in the United States, 1969 to 2005. Environ. Mon. and Assess. 175: 175-191, doi:10.1007/s10661-010-1504-6.<br /> <br /> 17. Chan, C., Heinbokel, J.F., Myers, J.A., Jacobsk, R.R., 2011. Development and evaluation of a dynamic model that projects population biomarkers of methylmercury exposure from local fish consumption. Integrated Environ. Assess. and Man. 7: 624 to 635.<br /> <br /> 18. Chen, L., Dick, W.A., 2011. Gypsum as an Agricultural Amendment: General Use Guidelines, Ohio State University Extension Document, 36 pp. <br /> <br /> 19. Choi, H.-S., Rom, C.R., 2011. Estimated nitrogen use efficiency, surplus, and partitioning in young apple trees grown in varied organic production systems. Scientia Horticulturae 129: 674-679.<br /> <br /> 20. Clair, T.A., Burns, D., Rosas Pérez, I., Blais, J., Percy, K., 2011. Chapter 6 Ecosystems. In Technical Challenges of Multipollutant Air Quality Management. G.M. Hidy, Brook, J.R., Demerjian, K.L., Molina, L.T., Pennell, W.T., Scheffe, R.D. (eds.), Springer Science+Business Media, 553 pp., doi:10.1007/978-94-007-0304-9_10.<br /> <br /> 21. Clark, C.M., 2011. Chapter 11: Great Plains, in assessment of nitrogen deposition effects and empirical critical loads of nitrogen for ecoregions of the United States. Pardo, L.H.; Robin-Abbott, M.J.; Driscoll, C.T., eds., Gen. Tech. Rep. NRS-80. Newtown Square, PA: U.S. Dept. of Agriculture, Forest Service, Northern Research Station, 291 pp.<br /> <br /> 22. Coburn, S., Dix, B., Sinreich, R., Volkamer, R., 2011. Development and characterization of the CU ground MAX-DOAS instrument: lowering RMS noise and first measurements of BrO, IO, and CHOCHO near Pensacola, FL. Atmos. Meas. Tech. Discuss. 4: 247-284.<br /> <br /> 23. Coe, P.K., Johnson, B.K., Wisdom, M.J., Cook, J.G., Vavra, M., Nielson, R.M., 2011. Validation of elk resource selection models with spatially independent data. J. Wildlife Man. 75: 159-170, doi:10.1002/jwmg.10. <br /> <br /> 24. Committee on the Evaluation of Chesapeake Bay Program Implementation for Nutrient Reduction to Improve Water Quality, 2011. Achieving Nutrient and Sediment Reduction Goals in the Chesapeake Bay: An Evaluation of Program Strategies and Implementation. The National Academy Press, Washington DC, ISBN 978-309-21079-9, 247 pp.<br /> <br /> 25. Compton, J.E., Church, M.R., 2011. Salt additions alter short-term nitrogen and carbon mobilization in a coastal Oregon Andisol. J. Environ. Qual. 40: 1601-1606, doi:10.2134/jeq2011.0013.<br /> <br /> 26. Compton, J.E., Harrison, J.A., Dennis, R.L., Greaver, T.L., Hill, B.H., Jordan, S.J., Walker, H., Campbell, H.V., 2011. Ecosystem services altered by human changes in the nitrogen cycle: A new perspective for U.S. decision making. Ecology Letters 14: 804-815, doi:10.1111/j.1461-0248.2011.01631.x. <br /> <br /> 27. Cusack, D.F., Silver, W.L., Torn, M.S., Burton, S.D., Firestone, M.K., 2011. Changes in microbial community characteristics and soil organic matter with nitrogen additions in two tropical forests. Ecology 92: 621-632.<br /> <br /> 28. DeForest, J.L., McCarthy, B.C., 2011. Diminished soil quality in an old-growth, mixed mesophytic forest following chronic acid deposition. Northeastern Naturalist 18: 177-184. http://www.bioone.org/doi/full/10.1656/045.018.0204.<br /> <br /> 29. Dietze, M.C., Moorcroft, P.R., 2011. Tree mortality in the eastern and central United States: patterns and drivers. Global Change Biology 17: 3312-3326, doi:10.1111/j.1365-2486.2011.02477.x. <br /> <br /> 30. Dillon, P., Dixon, G., Driscoll, C., Giesy, J., Hulbert, S., Nriagu, J., 2011. Evaluation of Four Reports on Contamination of the Athabasca River System by Oil Sands Operations. Report of the Water Monitoring Data Review Committee, Government of Alberta, Canada, 55pp. <br /> <br /> 31. DiMilla, P.A., Nixon, S.W., Oczkowski, A.J., Altabet, M.A., McKinney, R.A., 2011. Some challenges of an upside down nitrogen budget: Science and management in Greenwich Bay, RI (USA). Marine Poll. Bulletin 62: 672-680.<br /> <br /> 32. Drenner, R.W., Chumchal, M.W., Wente, S.P., McGuire, M., Drenner, S.M., 2011. Landscape-level patterns of mercury contamination of fish in North Texas, USA. Environ. Tox. Chem. 30: 2041-2045.<br /> <br /> 33. Du, S., Rodenburg, L.A., 2011. Chapter 6 Measurement and modeling of semivolatile organic compounds in local atmospheres. In: Biophysico-chemical processes of anthropogenic organic compounds in environmental systems, Xing, B., Senesi, N., Huang, P.M. (eds.), John Wiley & Sons, Inc. ISBN-13: 9780470539637. <br /> <br /> 34. Eller, A.S.D., McGuire, K.L., Sparks, J.P., 2011. Responses of sugar maple and hemlock seedlings to elevated carbon dioxide under altered above- and belowground nitrogen sources. Tree Physiol. 31: 391-401, doi:10.1093/treephys/tpr014.<br /> <br /> 35. Endale, D.M., Fisher, D.S., Jenkins, M.B., Schomberg, H.S., Stevens, C.L., 2011. Water Quantity and Quality from a Small Georgia Pasture During 1998-2009: Impact of Drought. Proceedings of 2011 Georgia Water Resourc. Conference, held April 11 13, 2011, at The University of Georgia. <br /> <br /> 36. Epstein, D.M., 2011. 15N Tracer and Modeling Analyses of Nutrient Transport Through Lakes in a Subalpine Watershed. Masters Thesis, Watershed Sciences Dept., Utah State Univ., 107 pp.<br /> <br /> 37. Fain, X., Obrist, D., Pierce, A., Barth, C., Gustin, M.S., Boyle, D.P., 2011. Whole-watershed mercury balance at Sagehen Creek, Sierra Nevada, CA. Geochimica et Cosmochimica Acta 75: 2379-2392.<br /> <br /> 38. Fan, Y-C., 2011. Temporal and Spatial Distribution of Mercury and Heavy Metals in Wet Deposition in Taiwan. Masters Thesis, National Central University, Taiwan.<br /> <br /> 39. Faulkner, J.W., Zhang, W., Geohring, L.D., Steenhuis, T.S., 2011. Nutrient transport within three vegetative treatment areas receiving silage bunker runoff. J. Environ. Man. 92: 587-595. <br /> <br /> 40. Faulkner, J.W., Zhang, W., Geohring, L.D., Steenhuis, T.S., 2011. Tracer movement through paired vegetative treatment areas receiving silage bunker runoff. Soil Water Conservation 66: 18-28. <br /> <br /> 41. Felton. D., and K. Civerolo, 2011. Air monitoring plan for establishing an ambient mercury baseline for New York State, Final report. EPA RFA Number OAR-EMAD-05-16.<br /> <br /> 42. Finlay, J.C., Hood, J.M., Limm, M.P., Power, M.E., Schade, J.D., Welter, J.R., 2011. Light-mediated thresholds in stream-water nutrient composition in a river network. Ecology 92: 140-150.<br /> <br /> 43. Fisher, J.A., Jacob, D.J., Wang, Q., Bahreini, R., Carouge, C.C., Cubison, M.J., Dibb, J.E., Diehl, T., Jimenez, J.L., Leibensperger, E.M., Lu, Z., Meinders, M.B.J., Pye, H.O.T., Quinn, P.K., Sharmam, S., Streets, D.G., van Donkelaar, A., Yantosca, R.M., 2011. Sources, distribution, and acidity of sulfate ammonium aerosol in the Arctic in winter-spring. Atmos. Environ. 45: 7301-7318.<br /> <br /> 44. Flechard, C.R., Nemitz, E., Smith, R.I., Fowler, D., Vermeulen, A.T., Bleeker, A., Erisman, J.W., Simpson, D., Zhang, L., Tang, Y.S., Sutton, M.A., 2011. Dry deposition of reactive nitrogen to European ecosystems: a comparison of inferential models across the NitroEurope network. Atmos. Chem. Phys. 11: 27032728, doi:10.5194/acp-11-2703-2011.<br /> <br /> 45. Fortner, S.K., Lyons, W.B., Carey, A.E., Shipitalo, M.J., Welch, S.A., Welch, K.A., 2011. Silicate weathering and CO2 consumption within agricultural landscapes, the Ohio-Tennessee River Basin, USA. Biogeosciences Discuss. 8: 9431-9469, doi:10.5194/bgd-8-9431-2011. <br /> <br /> 46. Furl, C.V., Meredith, C.A., 2011. Mercury accumulation in sediment cores from three Washington State lakes: Evidence for local deposition from a coal-fired power plant. Arch. Environ. Contam. Toxicol. 60: 26-33, doi:10.1007/s00244-010-9530-5.<br /> <br /> 47. Gabriel , M., Howard, N., Atkins, S., 2011. Annual permit compliance monitoring report for mercury in downstream receiving waters of the Everglades Protection Area. Appendix 3B-1 in 2011South Florida Environmental Report. South Florida Water Management District, West Palm Beach, FL. <br /> <br /> 48. Gardner, K.K., McGlynn, B.L., Marshall, L.A., 2011. Quantifying watershed sensitivity to spatially variable N loading and the relative importance of watershed N retention mechanisms. Water Resour. Res. 47: W08524, doi:10.1029/2010WR009738.<br /> <br /> 49. Garten, C.T., Wullschleger, S.D., Classen, A.T., 2011. Review and model-based analysis of factors influencing soil carbon sequestration under hybrid poplar. Biomass and Bioenergy 35: 214-226. <br /> <br /> 50. Geiser, L.H., Nadelhoffer, K., 2011. Chapter 6: Taiga, in Assessment of nitrogen deposition effects and empirical critical loads of nitrogen for ecoregions of the United States. Pardo, L.H., Robin-Abbott, M.J., Driscoll, C.T., eds., Gen. Tech. Rep. NRS-80. Newtown Square, PA: U.S. Dept. of Agriculture, Forest Service, Northern Research Station, 291 pp.<br /> <br /> 51. Gilliam, F.S., Goodale, C.L., Pardo, L.H., Geiser, L.H., Lilleskov, E.A., 2011. Chapter 10: Eastern temperate forests, in Assessment of nitrogen deposition effects and empirical critical loads of nitrogen for ecoregions of the United States. Pardo, L.H., Robin-Abbott, M.J., Driscoll, C.T., eds., Gen. Tech. Rep. NRS-80. Newtown Square, PA: U.S. Dept. of Agriculture, Forest Service, Northern Research Station, 291 pp.<br /> <br /> 52. Gratz, L.E., Keeler, G.J., 2011. Sources of mercury in precipitation to Underhill, VT. Atmos. Environ. 45: 5440-5449.<br /> <br /> 53. Greaver, T.L., Liu, L., Bobbink, R., 2011. Chapter 17: Wetlands, in Assessment of nitrogen deposition effects and empirical critical loads of nitrogen for ecoregions of the United States. Pardo, L.H., Robin-Abbott, M.J., Driscoll, C.T., eds., Gen. Tech. Rep. NRS-80. Newtown Square, PA: U.S. Dept. of Agriculture, Forest Service, Northern Research Station, 291 pp.<br /> <br /> 54. Greenquist, M.A., Schwarz, A.K., Klopfenstein, T.J., Schacht, W.H., Erickson, G. E., Vander Pol, K.J., Luebbe, M.K., Brink, K.R., Baleseng, L.B., 2011. Effects of nitrogen fertilization and dried distillers grains supplementation: Nitrogen use efficiency. J. Anim. Sci. 89: 1146-1152, doi:10.2527/jas.2010-2902. <br /> <br /> 55. Guy, A., DeSutter, T., 2011. Effects of Major Flooding on Water and Sediment Characteristics in an Urban Environment, Technical Report No: ND11-01, North Dakota Water Resourc. Research Institute, North Dakota State University, Fargo, North Dakota, 27 pp.<br /> <br /> 56. Hansen, A.M., Corzo Juarez, C., 2011. Evaluation of the pollution of hydrological river basins: Priorities and needs, in Water resources in Mexico, Hexagon Series on Human and Environmental Security and Peace, Volume 7, Part 3, 201-215, doi:10.1007/978-3-642-05432-7_15.<br /> <br /> 57. Hanson, R.A., Stone, J., 2011. Mercury total Maximum Daily Load Evaluation for the State of South Dakota. South Dakota Dept. of Environ. and Natural Resourc., 23 pp.<br /> <br /> 58. Hendricks, G.S., Shukla, S., 2011. Water and nitrogen management effects on water and nitrogen fluxes in Florida flatwoods. J. Environ. Qual. 40: 1844-1856, doi:10.2134/jeq2011.0001.<br /> <br /> 59. Herndon, E.M., Jin, L., Brantley, S.L., 2011. Soils reveal widespread manganese enrichment from industrial inputs. Environ. Sci. Tech. 45: 241-247.<br /> <br /> 60. Hidy, G.H., Brook, J.R., Demerjian, K.L., 2011. Chapter 12 Past Examples of Multipollutant Air Quality. Management and Accountability. In Technical Challenges of Multipollutant Air Quality Management. G.M. Hidy, Brook, J.R., Demerjian, K.L., Molina, L.T., Pennell, W.T., Scheffe, R.D. (eds.), Springer Science+Business Media, 553 pp., doi:10.1007/978-94-007-0304-9_10.<br /> <br /> 61. Holland, A., Sorkin, J., 2011. Air Quality Analysis Technical Support Document For the White River Oil and Gas Leasing Environmental Impact Statement, in Support of Forest Service Contract AG-3187-C-06-0051, Modifications 0010 and 0024, ftp://ftp.air-resource.com/WhiteRiverNF/WRNF-TSDReport_070111.pdf.<br /> <br /> 62. Hong, S.-B., Kim, W.-H., Ko, H.J., Lee, S.-B., Lee, D.-E., Kang, C.-H., 2011. Characteristics of formate and acetate concentrations in precipitation at Jeju Island, Korea. Atmos. Res. 101: 427-437.<br /> <br /> 63. Huang, W., Wang, K., Breidt, F.J., Davis, R.A., 2011. A class of stochastic volatility models for environmental applications. J. Time Ser. Anal. 32: 364-377 doi:10.1111/j.1467-9892.2011.00735.x.<br /> <br /> 64. Inglett, P.W., Rivera-Monroy, V.H., Wozniak, J.R., 2011. Biogeochemistry of nitrogen across the Everglades landscape. Critical Reviews in Environ. Sci. Tech. 41: 187-216.<br /> <br /> 65. Isard, S.A., Barnes, C.W., Hambleton, S., Ariatti, A., Russo, J.M., Tenuta, A., Gay, D.A., and Szabo, L.J. 2011. Predicting soybean rust incursions into the North American continental interior using crop monitoring, spore trapping, and aerobiological modeling. Plant Dis. 95: 1346-1357.<br /> <br /> 66. Isidoro, D., Grattan, S.R., 2011. Predicting soil salinity in response to different irrigation practices, soil types and rainfall scenarios. Irrigation Sci. 29: 197-211. <br /> <br /> 67. Jao, Y.C., 2011. Comparison of precipitation chemistry observed at five island stations in East Asia. Masters Thesis, Graduate Institute of Atmospheric Physics, National Central University, Taiwan.<br /> <br /> 68. Jin, L., Andrews, D.M., Holmes, G.H., Lin, H., Brantley, S.L., 2011. Opening the black box: Water chemistry reveals hydrological controls on weathering in the Susquehanna Shale Hills Critical Zone Observatory. Vadose Zone J. 10: 928-942, doi:10.2136/vzj2010.0133.<br /> <br /> 69. Johnson, D.R., Ebert-May, D., Webber, P.J., Tweedie, C.E., 2011. Forecasting alpine vegetation change using repeat Sampling and a novel modeling approach. AMBIO 40: 693-704, doi:10.1007/s13280-011-0175-z.<br /> <br /> 70. Jones, R.O., Chapman, S.K., 2011. The roles of biotic resistance and nitrogen deposition in regulating non-native understory plant diversity. Plant Soil 345: 257-269, doi:10.1007/s11104-011-0778-y.<br /> <br /> 71. Karouna-Reiner, N.K., Snyder, R.A., Lange, T., Gibson, S., Allison, J.G., Wagner, M.E., Rao, K.R., 2011. Largemouth bass (Micropterus salmoides) and striped mullet (Mugil cephalus) as vectors of contaminants to human consumers in northwest Florida. Marine Environ. Res. 72: 96-104.<br /> <br /> 72. Kaushal, S.S., Groffman, P.M., Band, L.E., Elliott, E.M., Shields, C.A., Kendall, C., 2011. Tracking nonpoint source nitrogen pollution in human-impacted watersheds. Environ. Sci. Tech. 45: 8225-8232, dx.doi.org/10.1021/es200779e.<br /> <br /> 73. Ketterings, Q., Miyamoto, C., Mathur, R.R., Dietzel, K., Gami, S., 2011. A comparison of soil sulfur extraction methods. Soil Science Soc. America 75: 1578-1583, doi:10.2136/sssaj2010.0407. <br /> <br /> 74. Knapp, K.R., Ansari, S., Bain, C.L., Bourass, M.A., Dickinson, M.J., Funk, C., Helms, C.N., Hennon, C.C., Holmes, C.D., Huffman, G.J., Koss, J.P., Lee, H.-T., Loew, A., Magnusdotti, G., 2011. Globally gridded satellite observations for climate studies. Bull. Amer. Meteor. Soc. 92: 893-907, doi:http://dx.doi.org/10.1175/2011BAMS3039.1.<br /> <br /> 75. Koch, D., Bauer, S.E., del Genio, A., Faluvelgi, G., McConnell, J.R., Menon, S., Miller, R.L., Rind, D., Ruedy, R., Schmidt, G.A., Shindell, D., 2011. Coupled aerosol-chemistryclimate twentieth-century transient model investigation: Trends in short-lived species and climate responses. J. Climate 24: 2693-2714.<br /> <br /> 76. Kolka, R., Sebestyen, S., Verry, E.S., Brooks, K. (eds.), 2011. Peatland Biogeochemistry and Watershed Hydrology at the Marcell Experimental Forest. ISBN: 9781439814246, 512 pp.<br /> <br /> 77. Konkler, M.J, 2011. Methylmercury in Mosquitoes: Impact of a Large Coal-Fired Power Station in Central Ohio. Masters Thesis, Muskingum University, 2008 2011 Wright State University, 36 pp.<br /> <br /> 78. Lafabrie, C., Major, K.M., Major, C.S., Miller, M.M., Cebriana, J., 2011. Comparison of morphology and photo-physiology with metal/metalloid contamination in Vallisneria neotropicalis. J. Hazardous Materials 191: 356-365.<br /> <br /> 79. Lafreniere, M.J., Sinclair, K.E., 2011. Snowpack and precipitation chemistry at a high altitude site in the Canadian Rocky Mountains. J. Hydrology 409: 737-748.<br /> <br /> 80. Larssen, T., Duan, L., Mulfer, J., 2011. Deposition and leaching of sulfur, nitrogen and calcium in four forested catchments in China: Implications for acidification. Environ. Sci. Tech. 45: 1192-1198, dx.doi.org/10.1021/es103426p.<br /> <br /> 81. Latysh, N.E. and Wetherbee, G.A., 2011, Improved mapping of National Atmospheric Deposition Program wet-deposition in complex terrain using PRISM-gridded data sets. Environ. Mon. and Assess., doi 10.1007/s10661-011-2009-7, 16 p.<br /> <br /> 82. Lawrence, G.B., Simonin, H.A., Baldigo, B.P., Roy, K.M., Capone, S.B., 2011. Changes in the chemistry of acidified Adirondack streams from the early 1980s-2008. Environ. Poll. 159: 2750-2758.<br /> <br /> 83. Lawrence, G. B.; Sullivan, T. J.; Weathers, K. C.; Cosby, B. J.; McDonnell, T. C., 2011. Comparison of methods for estimating critical loads of acidic deposition in the western Adirondack region of New York. NYSERDA Report 11-13, New York State Energy Research and Technology Authority, Albany, NY.<br /> <br /> 84. Leibensperger, E.M., Mickley, L.J., Jacob, D.J., Chen, W.-T., Seinfeld, J.H., Nenes, A., Adams, P.J., Streets, D.G., Kuman, N., Rind, D., 2011. Climatic effects of 19502050 changes in U.S. anthropogenic aerosols  Part 1: Aerosol trends and radiative forcing. Atmos. Chem. Phys. Discuss. 11: 24085-24125, doi:10.5194/acpd-11-24085-2011.<br /> <br /> 85. Lin, J., Li, J., 2011. Nutrient response modeling in falls of the Neuse Reservoir. Environ. Man. 47: 398-409, doi:10.1007/s00267-011-9617-4.<br /> <br /> 86. Liu, J., Vogelmann, J.E., Zhu, Z., Key, C.H., Sleeter, B.M., Price, D.T., Chen, J.M., Cochrane, M.A., Eidenshink, J.C., Howard, S.M., Bliss, N.B., Jiang, H., 2011. Estimating California ecosystem carbon change using process model and land cover disturbance data: 19512000. Ecological Modeling 222: 2333-2341.<br /> <br /> 87. Lloyd, P., 2011. Air pollution perceptions and their impacts on the coal industry. J. Southern African Institute of Mining and Metallurgy 111: 573-579.<br /> <br /> 88. Lobdell, D.T., Jagai, J.S., Rappazzo, K., Messer, L.C., 2011. Data Sources for an Environmental Quality Index: Availability, Quality, and Utility. Am. J. Public Health. 101: S277-S285, doi:10.2105/AJPH.2011.300184.<br /> <br /> 89. Lombard, M.A.S., Bryce, J.G., Mao, H., Talbot, R., 2011. Mercury deposition in southern New Hampshire, 2006 to 2009. Atmos. Chem. Phys. Discuss. 11: 4569-4598, www.atmos-chem-phys-discuss.net/11/4569/2011/.<br /> <br /> 90. Long, R.P., Horsley, S.B., Hall, T.J., 2011. Long-term impact of liming on growth and vigor of northern hardwoods. Can. J. For. Res. 41: 1295-1307, doi:10.1139/X11-049.<br /> <br /> 91. Lottig, N.R., Stanley, E.H., Hanson, P.C., Kratz, T.K., 2011. Comparison of regional stream and lake chemistry: Differences, similarities, and potential drivers. Limnol. Oceanogr., 56: 1551-1562, doi:10.4319/lo.2011.56.5.1551.<br /> <br /> 92. Lucas, R.W., Klaminder, J., Futter, M.N., Bishop, K.H., Engell, G., Luadon, H., Hogberg, P., 2011. A meta-analysis of the effects of nitrogen additions on base cations: Implications for plants, soils, and streams. Forest Ecology and Man. 262: 95-104.<br /> <br /> 93. Luo, C.L., Wang, Y., Mueller, S., Knipping, E., 2011. Diagnosis of an underestimation of summertime sulfate using the Community Multiscale Air Quality model. Atmos. Environ. 45: 5119-5130.<br /> <br /> 94. Malapati, A., Bronson, K.F., Booker, J.D., Hudnall, W.H., Schubert, A.M., 2011. Soil profile sulfate in irrigated southern high plains cotton fields and Ogallala groundwater. J. Soil and Water Conservation 66: 287-294, doi:10.2489/jswc.66.5.287. <br /> <br /> 95. Mast, M.A., Turk, J.T., Clow, D.W., Campbell, D.H., 2011. Response of lake chemistry to changes in atmospheric deposition and climate in three high-elevation wilderness areas of Colorado. Biogeochemistry 103: 27-43, doi:10.1007/s10533-010-9443-4.<br /> <br /> 96. May, D.B., 2011. Prediction of Urban Stormwater Quality at Unmonitored Catchments Using Artificial Neural Networks. Doctor of Philosophy Dissertation, University of Wollongong. School of Civil, Mining and Environmental Engineering, University of Wollongong, 2011. http://ro.uow.edu.au/theses/3411, 607 pp.<br /> <br /> 97. McLauchlan, K.K., Craine, J.M., 2011. Species-specific trajectories of nitrogen isotopes in Indiana hardwood forests, USA. Biogeosciences Discuss. 8: 5935-5954, doi:10.5194/bgd-8-5935-2011.<br /> <br /> 98. Miller, M.B., Gustin, M.S., Eckley, C.S., 2011. Measurement and scaling of airsurface mercury exchange from substrates in the vicinity of two Nevada gold mines. Science of the Total Environ. 409: 3879-3886.<br /> <br /> 99. Mitchell, M.J., Lovett, G., Bailey, S., Beall, F., Burns, D., Buso, D., Clair, T., Courchesne, F., Duchesne, L., Eimers, C., Fernandez, I., Houle, D., Jeffries, D.S., Likens, G.E., Moran, M.D., Rogers, C., Schwede, D., Shanley, J., Weathers, K.C., Vet, R., 2011. Comparisons of watershed sulfur budgets in southeast Canada and northeast U.S.: new approaches and implications. Biogeochemistry 103: 181-207.<br /> <br /> 100. Money, E.S., Sackett, D.K., Aday, D.D., Serre, M.L., 2011. Using river distance and existing hydrography data can improve the geostatistical estimation of fish tissue mercury at unsampled locations. Environ. Sci. Tech. 45: 7746-7753 dx.doi.org/10.1021/es2003827.<br /> <br /> 101. Monson, B.A., Staples, D.F., Bhavsar, S.P., Holsen, T.M., Schrank, C.S., Moses, S.K., McGoldrick, D.J., Backus, S.M., Williams, K.A., 2011. Spatiotemporal trends of mercury in walleye and largemouth bass from the Laurentian Great Lakes Region. Ecotoxicology 20: 1555-1567, doi:10.1007/s10646-011-0715-0.<br /> <br /> 102. Montgomery, C.W., 2011. Environmental Geology. McGraw-Hill Publishing, New York, NY, 542 pp.<br /> <br /> 103. Moore, C.W., 2011. Factors Influencing Surface Atmosphere Exchange of Gaseous Elemental Mercury in Western Maryland. Doctor of Philosophy Dissertation, Graduate School of the University of Maryland, College Park, MD, 128 pp.<br /> <br /> 104. Moore, R.B., Johnston, C.M., Smith, R.A., Milstead, B., 2011. Source and delivery of nutrients to receiving waters in the northeastern and Mid-Atlantic regions of the United States. J. American Water Resour. Assoc. 47: 965-990, doi:10.1111/j.1752-1688.2011.00582.x.<br /> <br /> 105. Morton, J.L., 2011. Evaluating the Role of Mercury Chemistry in the Community Multiscale Air Quality Model. Master¼s Thesis, University of Wisconsin-Madison, Madison, WI, 164 pp.<br /> <br /> 106. Naftz, D.L., Schuster, P.F., Johnson, C.A., 2011. A 50-year record of NOx and SO2 sources in precipitation in the Northern Rocky Mountains, USA. Geochemical Transactions 12: 10 pp., doi:10.1186/1467-4866-12-4.<br /> <br /> 107. Naik, A.P., Hammerschmidt, C.R., 2011. Mercury and trace metal partitioning and fluxes in suburban Southwest Ohio watersheds. Water Res. 45: 5151-5160.<br /> <br /> 108. Nasr, M., Arp, P.A., 2011. Hg concentrations and accumulations in fungal fruiting bodies, as influenced by forest soil substrates and moss carpets. Applied Geochemistry 26: 1905-1917.<br /> <br /> 109. Nel, C., 2011. Recent hydrologic change in a Colorado alpine basin: An indicator of permafrost thaw? Annals of Glaciology 51: 130-134.<br /> <br /> 110. Norton, S.A., Perry, R.H., Saros, J.E., Jacobson, G.L., Fernandez, I.J., Kopacek, J., Wilson, T.A., San Clements, M.D., 2011. The controls on phosphorus availability in a boreal lake ecosystem since deglaciation. J. Paleolimnol. 46: 107-122, doi:10.1007/s10933-011-9526-9.<br /> <br /> 111. Obrist, D., Johnson, D.W., Lindberg, S.E., Luo, Y., Hararuk, O., Bracho, R., Battles, J.J., Dail, D.B., Edmonds, R.L., Monson, R.K., Ollinger, S.V., Pallardy, S.G., Pregitzer, K.S., Todd, D.E., 2011. Mercury distribution across 14 U.S. forests. Part I: Spatial patterns of concentrations in biomass, litter, and soils. Environ. Sci. Tech. 45: 3974-3981, dx.doi.org/10.1021/es104384m.<br /> <br /> 112. Orem, W., Gilmour, C., Axelrad, D., Krabbenhoft, D., Scheidt, D., Kalla, P., McCormick, P., Gabriel, M., Aiken, G., 2011. Sulfur in the South Florida ecosystem: Distribution, sources, biogeochemistry, impacts, and management for restoration. Critical Reviews in Environ. Sci. Tech. 41 (S1): 249-288.<br /> <br /> 113. Pabian, S.E., Brittingham, M.C., 2011. Soil calcium availability limits forest songbird productivity and density. The Auk 128: 441-447.<br /> <br /> 114. Palaniswami, S., Jenicke, L.O., Kang, H., Okonkwo, P.A., Goffnett, S.P., 2011. The role of UN Environment Programme and the U.S. Environmental Protection Agency in global supply chain networks performance. Int. J. Logistics Systems and Man. 10: 53-69, doi:10.1504/IJLSM.2011.042052. <br /> <br /> 115. Pardo, L.H., Lilleskov, E.A., Geiser, L.H., Robin-Abbott, M.J., 2011. Chapter 4 Methods, in Assessment of nitrogen deposition effects and empirical critical loads of nitrogen for ecoregions of the United States. Pardo, L.H.; Robin-Abbott, M.J.; Driscoll, C.T., eds., Gen. Tech. Rep. NRS-80. Newtown Square, PA: U.S. Dept. of Agriculture, Forest Service, Northern Research Station, 291 pp.<br /> <br /> 116. Parrish, D.D., Singh, H.B., Molinac, L., Madronich, S., 2011. Air quality progress in North American megacities: A review. Atmos. Environ. 45: 7015-7025.<br /> <br /> 117. Peckham, S.D., Gower, S.T., 2011. Simulated long-term effects of harvest and biomass residue removal on soil carbon and nitrogen content and productivity for two Upper Great Lakes forest ecosystems. GCB Bioenergy 3: 135-147, doi:10.1111/j.1757-1707.2010.01067.x.<br /> <br /> 118. Perakis, S.S., Geiser, L.H., Lilleskov, E.A., 2011. Chapter 9: Marine West Coast forests. in Assessment of Nitrogen deposition effects and empirical critical loads of nitrogen for ecoregions of the United States. Pardo, L.H.; Robin-Abbott, M.J.; Driscoll, C.T., eds., Gen. Tech. Rep. NRS-80. Newtown Square, PA: U.S. Dept. of Ag., Forest Service, Northern Research Station, 291 pp.<br /> <br /> 119. Perakis, S.S., Sinkhorn, E.R., 2011. Biogeochemistry of a temperate forest nitrogen gradient. Ecology 92: 1481-1491.<br /> <br /> 120. Perakis, S.S., Sinkhorn, E.R., Compton, J.E., 2011. d15N constraints on long-term nitrogen balances in temperate forests. Oecologia 167: 793-807, doi:10.1007/s00442-011-2016-y.<br /> <br /> 121. Peters, D.P.C., 2011. Globalization: Chapter 11: Ecological consequences of global-scale connectivity in people, resources, and information. In The Systemic Dimension of Globalization, jornada.nmsu.edu<br /> <br /> 122. Pongprueksa, P., Lin, C.J., Singhasuk, P., Pan, L., Ho, T.C., Chu, H.W., 2011. Application of CMAQ at a hemispheric scale for atmospheric mercury simulations. Geosci. Model Dev. Discuss. 4: 1723-1754, doi:10.5194/gmdd-4-1723-2011.<br /> <br /> 123. Preston, S.D., Alexander, R.B., Schwarz, G.E., Crawford, C.G., 2011. Factors affecting stream nutrient loads: A synthesis of regional SPARROW model results for the Continental United States. J. American Water Resour. Assoc. 47: 891-915. doi:10.1111 D j.1752-1688.2011.00577.x.<br /> <br /> 124. Puchalski, M., Sather, M.E., Walker, J.T., Mathew, J., Robarge, W.P., Lehmann, C., Gay, D.A., 2011. Passive ammonia monitoring in the United States: Comparing three different sampling devices. Environ. Mon. 13: 3156-3167, doi:10.1039/C1EM10553A.<br /> <br /> 125. Rebich, R.A., Houston, N.A., Mize, S.V., Pearson, D.K., Ging, P.B., Hornig, C.E., 2011. Sources and delivery of nutrients to the northwestern Gulf of Mexico from streams in the south-central United States. J. American Water Resour. Assoc. 47: 1061-1086, doi:10.1111/j.1752-1688.2011.00583.x.<br /> <br /> 126. Richer, E., Botte, J., Baron, J., 2011. Loch Vale Watershed Long-term Research and Monitoring Program: Methods Manual 2011. Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, Colorado USA, 96 pp.<br /> <br /> 127. Riscassi, A.L., Hokanson, K.J., Scanlon, T.M., 2011. Streamwater particulate mercury and suspended sediment dynamics in a forested headwater catchment. Water Air Soil Poll. 220: 23-36, doi:10.1007/s11270-010-0731-3.<br /> <br /> 128. Riva-Murray, K., Chasar, L.C., Bradley, P.M., Burns, D.A., Brigham, M.E., Smith, M.J., Abrahamsen, T.A., 2011. Spatial patterns of mercury in macroinvertebrates and fishes from streams of two contrasting forested landscapes in the eastern United States. Ecotoxicology 20: 1530-1542, doi:10.1007/s10646-011-0719-9.<br /> <br /> 129. Robertson, D.M., Saad, D.A., 2011. Nutrient inputs to the Laurentian Great Lakes by source and watershed estimated using SPARROW watershed models. J. American Water Resour. Assoc. 47: 1011-1033, doi:10.1111/j.1752-1688.2011.00574.x.<br /> <br /> 130. Rom, W.N., 2011. Environmental Policy and Public Health: Air Pollution, Global Climate Change, and Wilderness. Jossey-Bass Publishers, San Francisco, CA, ISBN 978-0-470-59343-1, 407pp.<br /> <br /> 131. Rossignol, K.L., Paerl, H.W., Fear, J.M., Braddy, J.S., 2011. Nutrients in precipitation and the phytoplankton responses to enrichment in surface waters of the Albemarle Peninsula, NC, USA after the establishment of a large-scale chicken egg farm. Hydrobiologia 671: 181-191, doi:10.1007/s10750-011-0715-3. <br /> <br /> 132. Rumbold, D.G., Evans, D.W., Niemczyk, S., Fink, L.E., Laine, K.A., Howard, N., Krabbenhoft, D.P., Zucker, M., 2011. Source identification of Florida Bay's methylmercury problem: Mainland runoff versus atmospheric deposition and In situ production. Estuaries and Coasts 34: 494-513, doi:10.1007/s12237-010-9290-5.<br /> <br /> 133. Sarkar, S., Miller, S.A., Frederick, J.R., Chamberlain, J.F., 2011. Modeling nitrogen loss from switchgrass agricultural systems. Biomass and Bioenergy 35: 4381-4389. <br /> <br /> 134. Saros, J.E., Clow, D.W., Blett, T. Wolfe, A.P., 2011. Critical nitrogen deposition loads in high-elevation lakes of the western U.S. inferred from paleolimnological records. Water Air Soil Poll. 216: 193-202, doi:10.1007/s11270-010-0526-6.<br /> <br /> 135. Scanlon, B.R., Reedy, R.C., Gates, J.B., Gowda, P.H., 2010. Impact of agroecosystems on groundwater resources in the Central High Plains, USA. Agriculture, Ecosystems and Environ. 139: 700-713.<br /> <br /> 136. Schaberg, P.G., Lazarus, B.E., Hawley, G.J., Halman, J.M., Borer, C.H., Hansen, C.F., 2011. Assessment of weather-associated causes of red spruce winter injury and consequences to aboveground carbon sequestration. Can. J. For. Res. 41: 359-369, doi:10.1139/X10-202. <br /> <br /> 137. Scheffe, R.D., Brook, J.R., Demerjian, K.L., 2011. Chapter 10 Air quality measurements. In Technical Challenges of Multipollutant Air Quality Management. G.M. Hidy, Brook, J.R., Demerjian, K.L., Molina, L.T., Pennell, W.T., Scheffe, R.D. (eds.), Springer Science+Business Media, 553 pp., doi:10.1007/978-94-007-0304-9_10.<br /> <br /> 138. Schmeltz, D., Evers, D., Driscoll, C.T., Artz, R., Cohen, M., Gay, D.A., Haeuber, R., Krabbenhoft, D., Mason, R., Masson, G., Morris, K., Wiener, J.G., 2011. MercNet: A national monitoring network to assess responses to changing mercury emissions in the United States. Environ. Tox. 20: 1713-1725, doi:10.1007/s10646-011-0756-4.<br /> <br /> 139. Schmitt, C.J., Stricker, C.A., Brumbaugh, W.G., 2011. Mercury bioaccumulation and biomagnifications in Ozark stream ecosystems. Ecotoxicology Environ. Safety 74: 2215-2224.<br /> <br /> 140. Seabloom, E.W., Denfield, C.D., Borer, E.T., Stanley, A.G., Kaye, T.N., Dunwiddie, P.W., 2011. Provenance, life span, and phylogeny do not affect grass species responses to nitrogen and phosphorus. Ecological Applications 21: 2129-2142.<br /> <br /> 141. Seigneur, C., Dennis, R., 2011. Chapter 9: Atmospheric modeling. In Technical Challenges of Multipollutant Air Quality Management. G.M. Hidy, Brook, J.R., Demerjian, K.L., Molina, L.T., Pennell, W.T., Scheffe, R.D. (eds.), Springer Science+Business Media, 553 pp., doi:10.1007/978-94-007-0304-9_10.<br /> <br /> 142. Shaftel, R.S., King, R.S., Back, J.A., 2011. Breakdown rates, nutrient concentrations, and macroinvertebrate colonization of bluejoint grass litter in headwater streams of the Kenai Peninsula, Alaska. J. North American Benthological Soc. 30: 386-398, doi:10.1899/10-086.1.<br /> <br /> 143. Shanley, J.B., McDowell, W.H., Stallard, R.F., 2011. Longterm patterns and shortterm dynamics of stream solutes and suspended sediment in a rapidly weathering tropical watershed. Water Resour. Res. 47: W07515, doi:10.1029/2010WR009788.<br /> <br /> 144. Shih, R., Robertson, W.D., Schiff, S.L., Rudolph, D.L., 2011. Nitrate controls methyl mercury production in a streambed bioreactor. J. Environ. Qual. 40: 1586-1592, doi:10.2134/jeq2011.0072.<br /> <br /> 145. Singer, J.W., Malone, R.W., Jaynes, D.B., Ma, L., 2011. Cover crop effects on nitrogen load in tile drainage from Walnut Creek Iowa using root zone water quality (RZWQ) model. Agricultural Water Man. 98: 1622-1628. <br /> <br /> 146. Skogen, K.A., Holsinger, K.E., Cardon, Z.G., 2011. Nitrogen deposition, competition and the decline of a regionally threatened legume, Desmodium cuspidatum. Oecologia 165: 261-269, doi:10.1007/s00442-010-1818-7.<br /> <br /> 147. Slemr, F., Grunke, E.-G., Ebinghaus, R., Kuss, J., 2011. Worldwide trend of atmospheric mercury since 1995. Atmos. Chem. Phys. 11: 4779-4787, doi:10.5194/acp-11-4779-2011.<br /> <br /> 148. Stackpoole, S.M., Kosola, K.R., Workmaster, B.A.A., Buldan, N.M., Browne, B.A., Jackson, R.D., 2011. Looking beyond fertilizer: Assessing the contribution of nitrogen from hydrologic inputs and organic matter to plant growth in the cranberry agroecosystem. Nutr. Cycl. Agroecosyst. 91: 41-54, doi:10.1007/s10705-011-9442-4. <br /> <br /> 149. Stoleson, S.H., King, D.L., Tomosy, M., 2011. Avian research on U.S. Forest Service Experimental Forests and Ranges: Emergent themes, opportunities, and challenges. Forest Ecology and Man. 262: 49-52.<br /> <br /> 150. Sullivan, T.J., Cosby, B.J., Jackson, W.A., 2011. Target loads of atmospheric sulfur deposition for the protection and recovery of acid-sensitive streams in the Southern Blue Ridge Province. J. Environ. Man. 92: 2953-2960.<br /> <br /> 151. Sullivan, T.J., Cosby, B.J., Jackson, W.A., Snyder, K.U., Herlihy, A.T., 2011. Acidification and prognosis for future recovery of acid-sensitive streams in the southern Blue Ridge province. Water Air Soil Poll. 219: 11-26, doi:10.1007/s11270-010-0680-x. <br /> <br /> 152. Szilagyi, J., Zlotnik, V.A., Gates, J.B., Jozsa, J., 2011. Mapping mean annual groundwater recharge in the Nebraska Sand Hills, USA. Hydrogeology J. 19: 1503-1513, doi:10.1007/s10040-011-0769-3. <br /> <br /> 153. Talhelm, A.F., Pregitzer, K.S., Burton, A.J., Zak, D.R., 2011. Air pollution and the changing biogeochemistry of northern forests. Front. Ecol. Environ. 2011; doi:10.1890/110007. <br /> <br /> 154. Templer, P.H., Weathers, K.C., 2011. Use of mixed ion exchange resin and the denitrifier method to determine isotopic values of nitrate in atmospheric deposition and canopy throughfall. Atmos. Environ. 45: 2017-2020.<br /> <br /> 155. Trettin, C.C., Jurgensen, M.F., Gale, M.R., McLaughlin, J.W., 2011. Recovery of carbon and nutrient pools in a northern forested wetland 11 years after harvesting and site preparation. Forest Ecology and Man. 262: 1826-1833.<br /> <br /> 156. Tsai, J., 2011. Long-Term Changes in Forest Soils of Maine and Illinois. Masters Thesis, in the Graduate College of the University of Illinois at Urbana-Champaign, Urbana, Illinois, 119 pp. <br /> <br /> 157. U.S. EPA Science Advisory Board, Integrated Nitrogen Committee, 2011. Reactive Nitrogen in the United States: An Analysis of Inputs, Flows, Consequences, and Management, Options  A Report of the EP A Science Advisory Board. Otto C. Doering III, Chair, EPA-SAB-11-013, Washington, DC 20460, 172 pp.<br /> <br /> 158. Van Diepen, L.T.A., Lilleskov, E.A. and Pregitzer, K.S., 2011. Simulated nitrogen deposition affects community structure of arbuscular mycorrhizal fungi in northern hardwood forests. Molecular Ecology 20: 799-811, doi:10.1111/j.1365-294X.2010.04969.x.<br /> <br /> 159. Waas, D., 2011. Assessment of Pollutant Exposure and Nitrogen Enrichment Experienced at the University of Michigan Biological Station in 2007. Undergraduate Research Experience Appears in Collections: Biological Station, University of Michigan (UMBS), Dr. M. A. Carroll.<br /> <br /> 160. Weathers, K.C., Ponette-González, A.G., 2011. Chapter 17: Atmospheric Deposition, in Comparisons of Watershed Sulfur Budgets in Southeast Canada and Northeast US: New Approaches and Implications by M. J. Mitchell, G. Lovett, S. Bailey, F. Beall and D. Burns, et al., 181207.<br /> <br /> 161. Welch, H.L., Green, C.T., Coupe, R.H., 2011. The fate and transport of nitrate in shallow groundwater in northwestern Mississippi, USA. Hydrogeology J. 19: 1239-1252, doi:10.1007/s10040-011-0748-8.<br /> <br /> 162. Wesner, J.S., Cornelison, J.W., Dankmeyer, C.D., Galbreath, P.F., Martin, T.H., 2011. Growth, pH tolerance, survival, and diet of introduced northern-strain and native southern-strain Appalachian brook trout. Trans. American Fisheries Soc. 140: 37-44, dx.doi.org/10.1080/00028487.2011.545022.<br /> <br /> 163. Wetherbee, G.A., Latysh, N.E., Lehmann, C.M.B., and Rhodes, M.F., 2011, Four studies on effects of environmental factors on the quality of National Atmospheric Deposition Program measurements. U.S. Geological Survey Open-File Report 2011-1170, 36 p.<br /> <br /> 164. Winder, V.L., Emslie, S.D., 2011. Mercury in breeding and wintering Nelsons Sparrows (Ammodramus nelsoni). Ecotoxicology 20: 218-225, doi:10.1007/s10646-010-0573-1.<br /> <br /> 165. Willander, R., 2011. Spatio-Temporal Study of Mercury Deposition. For the International Summer Water Resourc. Research School, Dept. of Water Resourc. Engineering, Lund University, http://www.tvrl.lth.se/fileadmin/tvrl/files/vvrf05/, 16pp.<br /> <br /> 166. Willey, J.D., Glinski, D.A., Southwell, M., Long, M.S., Avery Jr., G.B., Kieber, R.J., 2011. Decadal variations of rainwater formic and acetic acid concentrations in Wilmington, NC, USA. Atmos. Environ. 45: 1010-1014.<br /> <br /> 167. Williams, M.W., Barnes, R.T., Parman, J.N., Freppaz, M., Hood, E., 2011. Stream water chemistry along an elevational gradient from the Continental Divide to the foothills of the Rocky Mountains. Vadose Zone J. 10: 900-914, doi:10.2136/vzj2010.0131.<br /> <br /> 168. Wise, D.R. and Johnson, H.M., 2011. Surface-water nutrient conditions and sources in the United States Pacific Northwest. J. American Water Resour. Assoc. 47: 1110-1135, doi:10.1111/j.1752-1688.2011.00580.x.<br /> <br /> 169. Wozniak, A.S., Bauer, J.E., Dickhut, R.M., 2011. Fossil and contemporary aerosol particulate organic carbon in the eastern United States: Implications for deposition and inputs to watersheds. Global Biogeochemical Cycles 25: GB2013, 14 pp., doi:10.1029/2010GB003855. <br /> <br /> 170. Xing, B., Senesi, N., Huang, P.M. (eds.) 2011. Index, in Biophysico-Chemical processes of anthropogenic organic compounds in environmental systems, John Wiley & Sons, Inc., Hoboken, NJ, USA, doi:10.1002/9780470944479.index.<br /> <br /> 171. Yee, D., McKee, L.J. and Oram, J.J., 2011. A regional mass balance of methylmercury in San Francisco Bay, California, USA. Environ. Tox. and Chem. 30: 88-96, doi:10.1002/etc.366.<br /> <br /> 172. Yu, W.T., Jiang, C.M., Ma, Q., Xu, Y.G., Zou, H., Zhang, S.C., 2011. Observation of the nitrogen deposition in the lower Liaohe River Plain, Northeast China and assessing its ecological risk. Atmos. Res. 101: 460-468, doi:10.1016/j.atmosres.2011.04.011. <br />

Impact Statements

1. As a National Research Support Project, the NADPs most important impacts are the research reports and journal articles that are produced using our data and products. From January through December 2011, we identified 172 journal articles and reports that used NADP data or maps specifically in their research, modeling applications, or for comparison. These articles are included in our online database of NADP-supported publications. Here, 16 articles which are of particular interest to the agricultural community are briefly summarized.
2. Aitkenhead-Peterson et al. studied the use of green roof technology popular in the Southwest to reduce runoff in water-limited areas. Specifically the authors investigated the chemical gain and loss relative to the input growth medium used in supporting the rooftop growth media. NADP information (N) in precipitation was used as added N input to their observations.
3. Chen and Dick developed an outreach document for the Ohio State University Extension to guide usage of flue-gas-derived gypsum as a calcium and sulfur additive for agricultural application. NADP data were used to show decreasing addition of sulfate to soils by wet deposition.
4. Dietze and Moorcroft studied tree mortality to determine what forcings were important across the eastern two-thirds of the U.S. The authors conclude that the two most important factors are forest stand characteristics and air pollution. NADP information for nitrate, ammonium, sulfate, and acid ions was used extensively to define air pollutant inputs to these systems.
5. Faulkner et al. investigated the changes in animal waste water after treatment using silage bunker impoundment areas. The authors were looking at ammonium, nitrogen, chloride, and phosphorus removal efficiencies, which were quite high in some cases. Chemical input to the bunkers from precipitation was defined using NADP nitrate, ammonium, and chloride information for the New York area.
6. Fortner et al. (including one USDA ARS scientist) investigated the influence of human agricultural practices on silicate weathering. They found that dissolved silica yields are sensitive to nitrogen fertilizer applications, etc. NADP data were used to correct stream flow chemistry from chemical additions by wet deposition.
7. Greenquist et al. investigated the addition of distillery grains as supplemental feed and/or forage substitution for yearling cows, where increases in N uptake were noted. NADP data were used in a nitrogen balance for pasture grasses normally used as forage and other feeding statistical treatments.
8. Isard et al. (including one USDA ARS scientist) used the NADP/NTN network and precipitation samples to investigate the weekly presence of soybean rust spores (Phakopsora pachyrhizi) in North American precipitation. With the genetic determination of spore presence, an incursion model was developed that was based on observations from 80 NADP sites in the eastern and mid-western U.S.
9. Ketterings et al. compared several new soil sulfur testing methods under different application rates, given the increasing need for agricultural sulfur application with the (NADP) noted reduction in sulfate from wet deposition. NADP information was used as baseline information for the experimentation and justification for the new tools.
10. Peters (a USDA ARS scientist) provided a chapter discussing ecological consequences of globalization, discussing many different subtopics. NADP data (N) were used to make long-term wet deposition maps of nitrogen within her discussion of large-scale ecological forcing.
11. Rossignol et al. investigated the changes in phytoplankton response in coastal North Carolina with the operation of a new large chicken egg production facility. The authors found doubling of wet deposition of nitrogen and phosphorus close to the facility, and the potential for increased wet deposition to surrounding waters. NADP data were used for baseline ammonia measurements, and NADP sampling methods were used for the study.
12. Sarkar et al. studied water quality and nitrogen loss from switchgrass agricultural systems. Significant nitrogen loss was noted in early crops but the losses decreased significantly with crop maturity. NADP nitrogen deposition was used as input to surface waters of nitrogen, providing an important input to the system.
13. Singer et al. (including one USDA scientist) investigated the effect of nitrogen loading on cover crops (soybean, winter wheat), focusing on tile drain nitrogen loading, and concluding that cover crops reduce nitrogen loss through tiles in these situations. NADP information provided baseline N input to the systems in precipitation.
14. Stackpoole et al. investigated the relationship of nitrogen input from non-fertilizer sources to characterize the contribution of several nitrogen sources to cranberry cultivation. NADP information was used as wet deposition input to surface water and the investigated subplots.
15. Szilagyi et al. estimated annual groundwater recharge in the Nebraska Sand Hills using a theoretical model. NADP data were used in a novel way, by using chloride in precipitation deposition as a tracer for flow into the aquifer. These results were used to check the accuracy of other recharge estimates.
16. Talhelm et al. studied the increasing wet deposition of nitrogens impact (NADP-derived trends) upon the biogeochemistry of northern Great Lakes area forests, attributing increases in available N in forests to increases in wet deposition and other N cycle changes. NADP data were used to document reduction in sulfur and increases in nitrogen deposition at all study sites.
17. Tsai (2011) (advisor, NRSP-3 participant) investigated soil genesis on a long-term basis in Maine and Illinois, specifically to detect if reduction in acid precipitation is evident in the chemical makeup of the soil. NADP provided baseline information on acid inputs to soils over multiple years.

Back to top

Report Information

Participants

A list of meeting participants from our 2012 Fall Meeting and Scientific Symposium can be downloaded from our website (http://nadp.isws.illinois.edu/conf/2012/), along with all of the presentations, posters, and other materials. There were 139 registrants and attendees at this years meeting.

Brief Summary of Minutes

All meeting minutes from our 2012 Spring Meeting (business meeting) and our 2012 Fall Meeting and Scientific Symposium (business, subcommittee meetings) are available on our website (http://nadp.isws.illinois.edu/committees/minutes.aspx). Several of the subcommittee minutes are delayed, but will be posted soon.

Accomplishments

The NRSP-3 provides a framework for cooperation among State Agricultural Experiment Stations (SAES), the U.S. Department of Agriculture, and other cooperating governmental and nongovernmental organizations that support the National Atmospheric Deposition Program (NADP). The NADP provides quality-assured data and information on the exposure of managed and natural ecosystems and cultural resources to acidic compounds, nutrients, base cations, and mercury in precipitation and through dry deposition of several of these compounds. NADP data support informed decisions on air quality issues related to precipitation chemistry.<br /> <br /> Specifically, researchers use NADP data to investigate the impacts of atmospheric deposition on the productivity of managed and natural ecosystems; the chemistry of estuarine, surface, and ground waters; and the biodiversity in forests, shrubs, grasslands, deserts, and alpine vegetation. These research activities address environmental stewardship, one of the Experiment Station Sections research challenges. Researchers also use NADP Mercury Deposition Network data to examine the role of atmospheric deposition in affecting the mercury content of fish, and to better understand the link between environmental and dietary mercury and human health. This fits with another research priority of relationship of food to human health.<br /> <br /> The NADP operates three precipitation chemistry networks: the National Trends Network (NTN), the Atmospheric Integrated Research Monitoring Network (AIRMoN), and the Mercury Deposition Network (MDN). <br /> <br /> The NTN provides the only long-term nationwide record of basic ion wet deposition in the United States. Sample analysis for these samples includes free acidity (H+ as pH), specific conductance, and concentration and deposition measurements for calcium, magnesium, sodium, potassium, sulfate, nitrate, chloride, bromide (new), and ammonium. We also measure orthophosphate ions (PO43-, the inorganic form), but only for quality assurance as an indicator of sample contamination. At the end of September, 2012, 257 NTN stations were collecting one-week precipitation samples in 48 states, Puerto Rico, the Virgin Islands, Canada, and a new site in Argentina. Additionally, there are multiple quality assurance and test sites. Complementing the NTN is the seven-site AIRMoN. AIRMoN sites are essentially NTN sites operated on a daily basis (i.e., single precipitation events), with samples collected to support continued research of atmospheric transport and removal of air pollutants and development of computer simulations of these processes. <br /> <br /> The 110-site MDN offers the only long-term and routine measurements of mercury in North American precipitation. Measurements of total mercury concentration and deposition (and optional methyl-mercury) are used to quantify mercury deposition to water bodies, some of which have fish and wildlife mercury consumption advisories. In 2008, every state and 10 Canadian provinces listed advisories warning people to limit fish consumption due to high mercury levels. Coastal advisories are also in place for Atlantic waters from Maine to Rhode Island, from North Carolina to Florida, for the entire U.S. Gulf Coast, and for coastal Hawaii and Alaska.<br /> <br /> The NADP operates two newer gaseous atmospheric chemistry networks: the Atmospheric Mercury Network (AMNet) and the Ammonia Monitoring Network (AMoN), which is NADPs newest network. In each case, the network goal is to provide atmospheric concentrations of these particular gases, and then to estimate the rate of dry deposition (without precipitation) of the gas. In many cases, dry deposition of the gas could far exceed the wet deposition of the same compound. <br /> <br /> At the end of September 2012, 22 AMNet sites were collecting five-minute estimates of gaseous elemental mercury and two-hourly average concentrations of gaseous oxidized mercury and particulate bound mercury. The AMNet provides the only long-term region-wide record of basic atmospheric mercury concentrations in the United States. <br /> <br /> The AMoN has 58 sites operating as of September 2012, where two-week averages of atmospheric ammonia gas are being collected with passive devices. This low-cost network is designed to provide long-running estimates of ammonia in the atmosphere. These data are particularly important to agriculture, since many sources of ammonia are agricultural in nature. Data from both gaseous networks support continued research of atmospheric transport and removal of air pollutants and development of computer simulations of these processes.<br /> <br /> <br /> Short-term Outcomes and Outputs.<br /> <br /> Samples Collected. NADPs principal objective and accomplishment/outcome is the collection and analysis of samples for precipitation chemistry. Briefly, the NADP processed a total of 13,251 samples from the NTN, including 246 quality assurance (QA) samples. The analyses included observations of 10 different analyte concentrations and precipitation volume, which allow for calculation of deposition flux for each analyte. These same data were collected daily (i.e., every day with measurable precipitation) from the AIRMoN network. For the year, AIRMoN collected and processed 1,128 precipitation samples, including 168 QA samples. The MDN collected and processed 4,309 weekly mercury-in-precipitation samples, including 3,582 QA samples. The AMoN collected and quality assured 2,937 ammonia samples, which included 1,390 QA samples. The AMNet collected, quality assured, and produced approximately 38,000 hourly and two-hourly averages.<br /> <br /> NADP Database. Our second most important accomplishment/outcome is making data available to all for the support of continued research. Scientists, policymakers, educators, students, and others are encouraged to access data at no charge from the NADP website (http://nadp.isws.illinois.edu). This site offers online retrieval of individual data points, seasonal and annual averages, trend plots, concentration and deposition maps, reports, manuals, and other data and information about the program. As of today, 2011 calendar year data are complete and online, along with data through June of 2012. Data through September will be posted very soon. Website usage statistics provide evidence that our data are being used. During FY2012, website usage continued to grow. More than 40,000 registered users accessed our information, and have recorded over 27,800 data downloads from the site. The site annually receives well over than 1.25 million hits. We continually divide users into types, and for FY2012 about 40% were from federal and state agencies (somewhat higher than normal), 36% from universities, 16% from K-to-12 schools, and 8% from other individuals or organizations. The NADP website has registered users from more than 150 countries across the globe. These statistics demonstrate that NADP continues to be relevant to both the scientific and educational communities, and continues to attract new users.<br /> <br /> Map Summary. As with every year, during FY12 the annual maps of atmospheric pollutant concentrations and depositions were developed. These maps are used widely and constitute one of the major products of the network. Individual maps are filed by network, year, and constituent, and can be downloaded in several formats, with other formats planned (see examples at http://nadp.isws.illinois.edu/data/annualiso.aspx). Individual maps are compiled into annual Map Summary reports, and the 2011 Map Summary is also available for download (http://nadp.isws.illinois.edu/lib/dataReports.aspx). We print 2,000 copies of the Annual Summary each year, and we have now completed the distribution of the 2010 Map Summary.<br /> <br /> Scientific Meeting (Fall 2011). At the end of each federal year, a combined business and scientific meeting is held to showcase some of the latest deposition research that occurred during the year. During FY11, the meeting focused on NADP at the Nexus: Cross System Connections with a goal of determining new directions for the program (October 25 to 28, 2011 in Providence, Rhode Island). The meeting attracted 130 registered participants, and included six sessions, 30 oral presentations, and 24 posters. Individual talks discussed deposition estimates of other chemical species not currently sampled for, including organic nitrogen, metals, and bromine (new at the time). All presentations, posters, and meeting proceedings are available on the NADP website (http://nadp.isws.illinois.edu/conf/2011/).<br /> <br /> Scientific Meeting (Fall 2012). The latest scientific meeting was held in Portland, ME (October 1-5, 2012, The NADP Cooperative: State, Local, and tribal Perspectives). The goal of this meeting was to highlight the non-federal perspectives of the network and data use. The meeting had 139 registered participants, and included eight sessions, 41 oral presentations, and 18 posters. An agriculture/ammonia session discussed better emission inventories, confined animal emission rates, and using isotopes for ammonia deposition source attribution. All presentations, posters, and meeting proceedings are available on the NADP website (http://nadp.isws.illinois.edu/conf/2012/). Of specific note for this meeting was a session held on October 5th focusing on improving the estimates of total deposition (wet plus dry deposition). This session was very well attended, and minutes should also be available online soon (http://nadp.isws.illinois.edu/committees/tdep/minutes.aspx).<br /> <br /> These basic activities fulfilled the project objectives: (1) coordination of three networks; (2) quality assurance to ensure consistency; and (3) analytical, site support, and data validation services for the sites financed directly through this agreement.<br /> <br /> Additional Operation Notes. The NADP continues to convert our precipitation gages to an all-digital network, originating with a Technical Committee decision in 2006 (http://nadp.isws.illinois.edu/newissues/newgages/newequip.aspx). Currently, the network is operating with approximately 85% new digital networks.<br /> <br /> Further, an independent committee conducted an external review of the Mercury Analytical Laboratory during the summer of 2012. Reports of the review were provided at the Fall Meeting 2012, with a formal response and questions provided to the Executive Committee, with final reports forthcoming. Each laboratory and the Program Office (management) are independently reviewed every three years (one every year).<br /> <br /> NADPs fifth network, the Ammonia Monitoring Network (AMoN) has agricultural scientists in mind. Ammonia is of great concern regarding agriculture and air pollution. AMoN currently operates 58 sites, and has approximately 10,500 observations of atmospheric ammonia. AMoNs cost-efficient passive measurements can be used to estimate ammonia dry deposition, a process which is being considered (nadpweb.isws.illinois.edu/nh3net/).<br /> <br /> The Central Analytical Laboratory has begun to measure the concentration of bromide ion in all NADP samples as a routine analyte of the NTN and AIRMoN sites. Regular measurements will be released for the 2012 year. Bromide is important to agricultural users, given its fumigant usage. <br /> <br /> During the 2012 calendar year, 166 journal articles and reports were generated using the NADP data. These are listed in the Publications section. This is again evidence that NADP is producing data that are both valuable and useful.<br /> <br /> The USGS and NADP collaborated on tracking radionuclides wet deposition (131I, 134Cs, 137Cs) from the Japanese nuclear incident resulting from the March 2011 earthquake and tsunami. Normal precipitation samples from the NTN, AIRMoN, and MDN were used during the project, and the resulting studies (Wetherbee et al., 2012) can be found on the NADP website. By using the existing infrastructure of the NADPs networks in a new and important way, measurements were made that greatly added to the body of information on the impact of this accident on U.S. lands and population.<br /> <br /> At the Spring 2011 Meeting, the NADP committees voted to modify the maps from an earlier discrete contour map style to a new continuous color gradient map. The new maps are now available going back to 1994, and the older-style maps are also still available through 2010. These maps provide much more information to the depositional community by adding precipitation adjustments for elevation and locations.<br /> <br /> U.S. EPA scientists, with NADP, continued special studies to determine whether organic nitrogen deposition can be measured reliably and accurately. The results indicated that the measurements are reliable, and that organic N can be differentiated from the inorganic N in our samples. This will add much needed information to the understanding of N deposition patterns and sources.<br /> <br /> A new litterfall mercury monitoring initiative will measure mercury and methyl mercury in forest litterfall (leaves, twigs, etc.). These dry deposition estimates will complement the MDN wet deposition mercury monitoring. Initiation of the trial began in September 2012. Analysis and field support will be provided through the USGS.<br />

Publications

2012 NADP Reference Listing <br /> <br /> Includes 166 publications that used NADP data or resulted from NRSP-3 activities in 2012. A publically available online database that lists citations using NADP data is accessible at: http://nadp.isws.illinois.edu/lib/bibsearch.asp.<br /> <br /> 1. Air Resources Specialists, Inc., 2012. Oil and Gas Leasing in the Wyoming Range: Final Supplemental Environmental Impact Statement, Air Quality Analysis Technical Support Document for Bridger-Teton National Forest, 71 pp. <br /> <br /> 2. Alam, M. J., & Goodall, J. L., 2012. Toward disentangling the effect of hydrologic and nitrogen source changes from 1992 to 2001 on incremental nitrogen yield in the contiguous United States. Water Resources Research 48(4): W04506.<br /> <br /> 3. Allen, D. J., Pickering, K. E., Pinder, R. W., Henderson, B. H., Appel, K. W., & Prados, A., 2012. Impact of lightning-NO on eastern United States photochemistry during the summer of 2006 as determined using the CMAQ model. Atmospheric Chemistry & Physics 12: 1737 - 1758. <br /> <br /> 4. Amos, H. M., Jacob, D. J., Holmes, C. D., Fisher, J. A., Wang, Q., Yantosca, R. M., et al., 2012. Gas-particle partitioning of atmospheric hg(II) and its effect on global mercury deposition. Atmospheric Chemistry & Physics 12(1): 591 - 603. <br /> <br /> 5. Angradi, T. R., Bolgrien, D. W., Starry, M. A., & Hill, B. H., 2012. Modeled summer background concentration of nutrients and suspended sediment in the midcontinent (USA) great rivers. JAWRA Journal of the American Water Resources Association 48(5): 1054 - 1070. doi: 10.1111/j.1752-1688.2012.00669.x.<br /> <br /> 6. Arnett, H. A., Saros, J. E., & Alisa Mast, M., 2012. A caveat regarding diatom-inferred nitrogen concentrations in oligotrophic lakes. J Paleolimnology 47: 277 - 291. doi:10.1007/s10933-011-9576-z.<br /> <br /> 7. Arundale, R., 2012. The higher productivity of the bioenergy feedstock Miscanthus x giganteus relative to Panicum virgatum is seen both into the long term and beyond Illinois. Doctoral dissertation, University of Illinois, 116 pp. <br /> <br /> 8. Bagui, S., Brown, J., Caffrey, J., & Bagui, S., 2012. Designing a relational database for tracking and analysis of atmospheric deposition of mercury and trace metals in the Pensacola (Florida) Bay Watershed. International Journal of Sustainable Society 4(3): 240 - 265. <br /> <br /> 9. Bain, D. J., Yesilonis, I. D., & Pouyat, R. V., 2012. Metal concentrations in urban riparian sediments along an urbanization gradient. Biogeochemistry 107(1-3): 67 - 79. <br /> <br /> 10. Baiser, B., Gotelli, N. J., Buckley, H. L., Miller, T. E., & Ellison, A. M., 2012. Geographic variation in network structure of a nearctic aquatic food web. Global Ecology & Biogeography 21(5): 579 - 591.<br /> <br /> 11. Baker, K. R., & Bash, J. O., 2012. Regional scale photochemical model evaluation of total mercury wet deposition and speciated ambient mercury. Atmospheric Environment 49: 151 - 162.<br /> <br /> 12. Bash, J. O., Cooter, E. J., Dennis, R. L., Walker, J. T., & Pleim, J. E., 2012. Evaluation of a regional air-quality model with bi-directional NH3 exchange coupled to an agro-ecosystem model. Biogeosciences Discussions 9(8): 11375 - 11401. <br /> <br /> 13. Beaulieu, K. M., Button, D. T., Scudder Eikenberry, B. C., Riva-Murray, K., Chasar, L. C., Bradley, P. M., and Burns, D. A., 2012. Mercury bioaccumulation studies in the National Water-Quality Assessment ProgramBiological data from New York and South Carolina, 2005 - 2009: U.S. Geological Survey Data Series 705, 13 p., at http://pubs.usgs.gov/ds/705/.<br /> <br /> 14. Berkelhammer, M., Stott, L., Yoshimura, K., Johnson, K., & Sinha, A., 2012. Synoptic and mesoscale controls on the isotopic composition of precipitation in the western United States. Climate Dynamics 38: 433 - 454.<br /> <br /> 15. Bradley, P. M., Journey, C. A., Lowery, M. A., Brigham, M. E., Burns, D. A., Button, D. T., ... & Riva-Murray, K., 2012. Shallow groundwater mercury supply in a coastal plain stream. Environmental Science & Technology 46(14): 7503 - 7511. <br /> <br /> 16. Brooks, R. T., Eggert, S. L., Nislow, K. H., Kolka, R. K., Chen, C. Y., & Ward, D. M., 2012. Preliminary assessment of mercury accumulation in Massachusetts and Minnesota seasonal forest pools. Wetlands 32: 653 - 663.<br /> <br /> 17. Brown, T. C., & Froemke, P., 2012. Nationwide assessment of nonpoint source threats to water quality. BioScience 62(2): 136 - 146. <br /> <br /> 18. Brown, T. C., & Froemke, P., 2012. Improved measures of atmospheric deposition have a negligible effect on multivariate measures of risk of water-quality impairment: response from Brown and Froemke. BioScience 62(7): 621 - 622. <br /> <br /> 19. Bruder, S. R., 2012. Prediction of spatial-temporal distribution of algal metabolites in Eagle Creek Reservoir, Indianapolis, IN. Doctoral dissertation, Department of Earth Sciences, Indiana University, 142 pp.<br /> <br /> 20. Bruesewitz, D. A., Tank, J. L., & Hamilton, S. K., 2012. Incorporating spatial variation of nitrification and denitrification rates into whole-lake nitrogen dynamics. J Geophysical Research. 117: G00N07, doi:10.1029/2012JG002006.<br /> <br /> 21. Buenning, N. H., Stott, L., Yoshimura, K., & Berkelhammer, M., 2012. The cause of the seasonal variation in the oxygen isotopic composition of precipitation along the western U.S. coast. J Geophysical Research 117: 18114. <br /> <br /> 22. Cai, M., Johnson, A., Schwartz, J., Moore, S., & Kulp, M., 2012. Soil acid-base chemistry of a high-elevation forest watershed in the Great Smoky Mountains National Park: Influence of acidic deposition. Water, Air, & Soil Pollution 223(1): 289 - 303. <br /> <br /> 23. Calvo, A. I., Pont, V., Olmo, F. J., Castro, A., Alados-Arboledas, L., Vicente, A. M., ... & Fraile, R., 2012. Air masses and weather types: a useful tool for characterizing precipitation chemistry and wet deposition. Aerosol & Air Quality Research 12: 856 - 878.<br /> <br /> 24. Canham, C. D., Pace, M. L., Weathers, K. C., McNeil, E. W., Bedford, B. L., Murphy, L., & Quinn, S., 2012. Nitrogen deposition and lake nitrogen concentrations: a regional analysis of terrestrial controls and aquatic linkages. Ecosphere 3(7): 66. http://dx.doi.org/10.1890/ES12-00090.1.<br /> <br /> 25. Carey, R. O., Hochmuth, G. J., Martinez, C. J., Boyer, T. H., Nair, V. D., Dukes, M. D., ... & Sartain, J. B., 2012. Regulatory and resource management practices for urban watersheds: the Florida experience. Hort. Technology 22(4): 418 - 429. <br /> <br /> 26. Carlo, T. A., & Norris, A. E., 2012. Direct nitrogen intake by petals. Oikos 121: 1953 - 1958. <br /> <br /> 27. Castro, M. S., Moore, C., Sherwell, J., & Brooks, S. B., 2012. Dry deposition of gaseous oxidized mercury in western Maryland. Science of the Total Environment 417 - 418: 232 - 240. <br /> <br /> 28. Catalano, J. G., Huhmann, B. L., Luo, Y., Mitnick, E. H., Slavney, A., & Giammar, D. E., 2012. Metal release and speciation changes during wet aging of coal fly ashes. Environmental Science & Technology 46(21): 11804 - 11812.<br /> <br /> 29. Chen, C. Y., Driscoll, C. T., & Kamman, N. C., 2012. Mercury hotspots in freshwater ecosystems. Mercury in the Environment: Pattern and Process, 143, 340 pp. <br /> <br /> 30. Chen, J., Hintelmann, H., Feng, X., & Dimock, B., 2012. Unusual fractionation of both odd and even mercury isotopes in precipitation from Peterborough, ON., Canada. Geochimica et Cosmochimica Acta 90: 33 - 46.<br /> <br /> 31. Clark, E., Schlenker, K., & Filardi, C., 2012. Wilderness character monitoring report hyalite porcupine buffalo horn wilderness study area. U.S. Forest Service, Region 1 Report, Gallatin National Forest, 109 pp. <br /> <br /> 32. Coleman Wasik, J. K., Mitchell, C. P., Engstrom, D. R., Swain, E. B., Monson, B. A., Balogh, S. J., ... & Almendinger, J. E., 2012. Methylmercury declines in a boreal peatland when experimental sulfate deposition decreases. Environmental Science & Technology 46(12): 6663 - 6671.<br /> <br /> 33. Committee on Preparing for the Third Decade (Cycle 3) of the National Water-Quality Assessment (NAWQA) Program, & National Research Council, 2012. Preparing for the third decade (cycle 3) of the national water-quality assessment (NAWQA) program (prepublication copy). The National Academies Press, Washington DC, 160 pp.<br /> <br /> 34. Cope, B., & Roberts, M., 2012. Draft for stakeholder review: review and synthesis of available information to estimate human impacts to dissolved oxygen in hood canal. Office of Environmental Assessment Environmental Protection Agency, Region 10 Seattle, Washington and Environmental Assessment Program Washington State Department of Ecology, Olympia, Washington, 94 pp. <br /> <br /> 35. Cronan, C. S., 2012. Biogeochemistry of the Penobscot River watershed, Maine, USA: nutrient export patterns for carbon, nitrogen, and phosphorus. Environmental Monitoring & Assessment 184(7): 4279 - 4288.<br /> <br /> 36. Darrouzet-Nardi, A., Erbland, J., Bowman, W. D., Savarino, J., & Williams, M. W., 2012. Landscape-level nitrogen import and export in an ecosystem with complex terrain, Colorado Front Range. Biogeochemistry 109(1): 271 - 285.<br /> <br /> 37. Day, D. E., Chen, X., Gebhart, K. A., Carrico, C. M., Schwandner, F. M., Benedict, K. B., ... & Collett, J. L., 2012. Spatial and temporal variability of ammonia and other inorganic aerosol species. Atmospheric Environment 61: 490 - 498.<br /> <br /> 38. Denkenberger, J. S., Driscoll, C. T., Branfireun, B. A., Eckley, C. S., Cohen, M., & Selvendiran, P., 2012. A synthesis of rates and controls on elemental mercury evasion in the Great Lakes Basin. Environmental Pollution 161: 291 - 298. <br /> <br /> 39. Dilley, G., Council, D. R. A. Q., Morris, R., Koo, B., Tai, E., McNally, D., et al., 2012. Revised base case modeling and model performance evaluation for the Denver 2008 ozone episode. Final Report (Project 06-26421A), Denver Regional Air Quality Council, August, 113 pp.<br /> <br /> 40. Dodson, J., 2012. Draft report: nutrient TMDL for Jackson Blue Spring and Merritts Mill Pond (WBIDs 180Z and 180A), for the Florida Department of Environmental Protection, November, 95 pp.<br /> <br /> 41. Dohleman, F. G., Heaton, E. A., Arundale, R. A., & Long, S. P., 2012. Seasonal dynamics of aboveand belowground biomass and nitrogen partitioning in Miscanthus× giganteus and Panicum virgatum across three growing seasons. GCB Bioenergy 4: 534 - 544. <br /> <br /> 42. Drevnick, P. E., Engstrom, D. R., Driscoll, C. T., Swain, E. B., Balogh, S. J., Kamman, N. C., et al., 2012. Spatial and temporal patterns of mercury accumulation in lacustrine sediments across the laurentian great lakes region. Environmental Pollution 161: 252 - 260. <br /> <br /> 43. Ebel, J. D., 2012. Biofilm responses to salmon carcass addition in central Idaho. Masters thesis (in Biological Sciences), Michigan Technology University, 70 pp.<br /> <br /> 44. Ebel, B. A., Moody, J. A., & Martin, D. A., 2012. Hydrologic conditions controlling runoff generation immediately after wildfire. Water Resources Research 48(3): W03529. <br /> <br /> 45. Fenn, M. E., Bytnerowicz, A., & Liptzin, D., 2012. Nationwide maps of atmospheric deposition are highly skewed when based solely on wet deposition. BioScience 62(7): 621 - 621.<br /> <br /> 46. Fernández, F. G., Ebelhar, S., Greer, K., & Brown, H., 2012. Corn response to sulfur in Illinois. Illinois Fertilizer & Chemical Association, FREC Reports, http://www.ifca.com/FREC%20Proceedings/. <br /> <br /> 47. Feyte, S., Gobeil, C., Tessier, A., & Cossa, D., 2012. Mercury dynamics in lake sediments. Geochimica et Cosmochimica Acta 82: 92 - 112. <br /> <br /> 48. Fissore, C., Hobbie, S. E., King, J. Y., McFadden, J. P., Nelson, K. C., & Baker, L. A., 2012. The residential landscape: fluxes of elements and the role of household decisions. Urban Ecosystems 15(1): 1 - 18. <br /> <br /> 49. Freppaz, M., Williams, M. W., Seastedt, T., & Filippa, G., 2012. Response of soil organic and inorganic nutrients in alpine soils to a 16-year factorial snow and N-fertilization experiment, Colorado Front Range, USA. Applied Soil Ecology 62: 131 - 141.<br /> <br /> 50. Forbes, M. G., Back, J., & Doyle, R. D., 2012. Nutrient transformation and retention by coastal prairie wetlands, upper Gulf Coast, Texas. Wetlands 32: 705 - 715. <br /> <br /> 51. Gao, X., 2012. Draft TMDL Report Nutrient TMDLs for Sykes Creek/Barge Canal (WBID 3044B), Florida Department of Environmental Protection, 75 pp.<br /> <br /> 52. Gillespie, J., Nelson, S. T., Mayo, A. L., & Tingey, D. G., 2012. Why conceptual groundwater flow models matter: a trans-boundary example from the arid Great Basin, western USA. Hydrogeology Journal 20: 1133 - 1147.<br /> <br /> 53. Gopalakrishnan, G., Cristina Negri, M., & Salas, W., 2012. Modeling biogeochemical impacts of bioenergy buffers with perennial grasses for a row-crop field in Illinois. GCB Bioenergy 4: 739 - 750, doi: 10.1111/j.1757-1707.2011.01145.x .<br /> <br /> 54. Grant, C. A., Mahli, S. S., & Karamanos, R. E., 2012. Sulfur management for rapeseed. Field Crops Research 128: 119 - 128.<br /> <br /> 55. Greaver, T. L., Sullivan, T. J., Herrick, J. D., Barber, M. C., Baron, J. S., Cosby, B. J., ... & Novak, K. J., 2012. Ecological effects of nitrogen and sulfur air pollution in the US: what do we know? Frontiers in Ecology and the Environment 10(7): 365 - 372. <br /> <br /> 56. Grenon, J. A., 2012. Epiphytic lichens, nitrogen deposition and climate in the US northern Rocky Mountain states, Doctoral dissertation, Montana State University, Bozeman, 162 pp.<br /> <br /> 57. Grigal, D. F., 2012. Atmospheric Deposition and Inorganic Nitrogen Flux. Water, Air, & Soil Pollution 223: 3565 - 3575. <br /> <br /> 58. Gupta, V. K., 2012. Environmental water: advances in treatment, remediation and recycling. Elsevier Publishing, Amsterdam, Netherlands, ISBN: 978-0-444-59399-3, 211 pp.<br /> <br /> 59. Gurdak, J. J., & Qi, S. L., 2012. Vulnerability of recently recharged groundwater in principle aquifers of the United States to nitrate contamination. Environmental Science & Technology 46(11): 6004 - 6012. <br /> <br /> 60. Han, H., & Allan, J. D., 2012. Uneven rise in N inputs to the Lake Michigan Basin over the 20th century corresponds to agricultural and societal transitions. Biogeochemistry 109(1): 175 - 187. <br /> <br /> 61. Hansen, J., 2012. Assessment of atmospheric nitrogen deposition: possible effects on alpine ecosystems above 9000 feet in Grand Teton National Park. Masters thesis, Utah State University, All Graduate Theses and Dissertations. Paper 1250, 185 pp. http://digitalcommons.usu.edu/etd/1250.<br /> <br /> 62. Harms, T. K., & Jones, J. B., 2012. Thaw depth determines reaction and transport of inorganic nitrogen in valley bottom permafrost soils. Global Change Biology 18 2958 - 2968, doi: 10.1111/j.1365-2486.2012.02731.x. <br /> <br /> 63. Harms, T. K., & Grimm, N. B., 2012. Responses of trace gases to hydrologic pulses in desert floodplains. J Geophysical Research 117(G1): G01035. <br /> <br /> 64. Harris, R., Pollman, C., Landing, W., Evans, D., Axelrad, D., Hutchinson, D., ... & Sunderland, E., 2012. Mercury in the Gulf of Mexico: sources to receptors. Environmental Research 119: 42 - 52.<br /> <br /> 65. Haynes, K. M., & Mitchell, C. P., 2012. Inter-annual and spatial variability in hillslope runoff and mercury flux during spring snowmelt. J Environmental Monitoring 14: 2083. <br /> <br /> 66. He, W. M., Montesinos, D., Thelen, G. C., & Callaway, R. M., 2012. Growth and competitive effects of Centaurea stoebe populations in response to simulated nitrogen deposition. PLOS ONE 7(4): e36257.<br /> <br /> 67. Hicks, R., & Holland, K., 2012. Nutrient TMDL for Silver Springs, Silver Springs group, and upper Silver River (WBIDs 2772A, 2772C, and 2772E). Florida Department of Environmental Protection, Division of Environmental Assessment and Restoration, Bureau of Watershed Restoration, 104 pp.<br /> <br /> 68. Holloway, T., Voigt, C., Morton, J., Spak, S. N., Rutter, A. P., & Schauer, J. J., 2012. An assessment of atmospheric mercury in the Community Multiscale Air Quality (CMAQ) model. Atmospheric Chemistry & Physics Discussions 12: 2131 - 2166.<br /> <br /> 69. Hong, Y.S., Hunter, S., Clayton, L. A., Rifkin E,. & Bouwer E J. 2012. Assessment of mercury and selenium concentrations in captive bottlenose dolphin's (Tursiops truncatus) diet fish, blood, and tissue. Science of the Total Environment 414: 220 - 226.<br /> <br /> 70. Huang, J., Kang, S., Zhang, Q., Yan, H., Guo, J., Jenkins, M. G., et al. Wet deposition of mercury at a remote site in the Tibetan plateau: Concentrations, speciation, and fluxes. Atmospheric Environment 62: 540 - 550. <br /> <br /> 71. Huang, J., & Gustin, M. S., 2012. Evidence for a free troposphere source of mercury in wet deposition in the western United States. Environmental Science & Technology 46(12): 6621 - 6629.<br /> <br /> 72. Jacobson, G. L., Norton, S. A., Grimm, E. C., & Edgar, T., 2012. Changing climate and sea level alter hg mobility at Lake Tulane, Florida, U.S. Environmental Science & Technology 46(21): 11710 - 11717.<br /> <br /> 73. Journey, C. A., Burns, D. A., Riva-Murray, K., Brigham, M. E., Button, D. T., Feaster, T. D., Petkewich, M. D., & Bradley, P. M., 2012. Fluvial transport of mercury, organic carbon, suspended sediment, and selected major ions in contrasting stream basins in South Carolina and New York, October 2004 to September 2009: U.S. Geological Survey Scientific Investigations Report 2012 - 5173, 125 p.<br /> <br /> 74. Kappel, C. V., Halpern, B. S., & Napoli, N., 2012. Mapping cumulative impacts of human activities on marine ecosystems. Coastal and Marine Spatial Planning, Report #03.NCEAS.12, 109 pp.<br /> <br /> 75. Ketterings, Q. M., Godwin, G., Gami, S., Dietzel, K., Lawrence, J., Barney, P., ... & Czymmek, K. J., 2012. Soil and tissue testing for sulfur management of alfalfa in New York State. Soil Science Society of America Journal 76(1): 298 - 306. <br /> <br /> 76. Kim, J. H., & Jackson, R. B., 2012. A global analysis of groundwater recharge for vegetation, climate, and soils. Vadose Zone Journal 11(1), doi: 10.2136/vzj2011. <br /> <br /> 77. Kim, M. K., & Zoh, K. D., 2012. Fate and transport of mercury in environmental media and human exposure. J Preventive Medicine and Public Health 45(6): 335 - 343. <br /> <br /> 78. Konkler, M. J., & Hammerschmidt, C. R., 2012. Methylmercury in mosquitoes around a large coalfired power plant in central Ohio. Environmental Toxicology & Chemistry 31(7): 1657 - 1661.<br /> <br /> 79. Koo, B., Piyachaturawat, P., Morris, R., & Knipping, E., 2012. Evaluation of the variability in chemical transport model performance for deposition and ambient concentrations of nitrogen and sulfur compounds. Atmosphere 3(3): 400 - 418.<br /> <br /> 80. Koskelo, A. I., Fisher, T. R., Utz, R., & Jordan, T. E., 2012. A new precipitation-based method of baseflow separation and event identification for small watersheds (< 50 km2). J Hydrology 450 - 451: 267 - 278.<br /> <br /> 81. Lan, X., Talbot, R., Castro, M., Perry, K., & Luke, W., 2012. Seasonal and diurnal variations of atmospheric mercury across the US determined from AMNet monitoring data. Atmospheric Chemistry & Physics Discussions 12: 10845 - 10878.<br /> <br /> 82. Latysh, N., & Wetherbee, G., 2012. Improved mapping of national atmospheric deposition program wet-deposition in complex terrain using PRISM-gridded data sets. Environmental Monitoring & Assessment 184(2): 913 - 928. <br /> <br /> 83. Lawrence, G. B., Shortle, W. C., David, M. B., Smith, K. T., Warby, R. A. F., & Lapenis, A. G., 2012. Early indications of soil recovery from acidic deposition in U.S. red spruce forests. Soil Science Society of America Journal 76(4): 1407 - 1417. <br /> <br /> 84. Lee, K. S., Lee, D. S., Lim, S. S., Kwak, J. H., Jeon, B. J., Lee, S. I., ... & Choi, W. J., 2012. Nitrogen isotope ratios of dissolved organic nitrogen in wet precipitation in a metropolis surrounded by agricultural areas in southern Korea. Agriculture, Ecosystems & Environment 159: 161 - 169. <br /> <br /> 85. Leibensperger, E. M., Mickley, L. J., Jacob, D. J., Chen, W. T., Seinfeld, J. H., Nenes, A., ... & Rind, D., 2012. Climatic effects of 1950 - 2050 changes in US anthropogenic aerosols - part 1: aerosol trends and radiative forcing. Atmospheric Chemistry & Physics 12, 3333 - 3348. <br /> <br /> 86. Lessard, C., 2012. Mass balance model of mercury for the St. Lawrence River, Cornwall, Ontario. Doctoral dissertation, University of Ottawa, 109 pp. <br /> <br /> 87. Li, Y., Tang, J., Yu, X., Xu, X., Cheng, H., & Wang, S., 2012. Characteristics of precipitation chemistry at Lushan Mountain, East China: 1992 - 2009. Environmental Science & Pollution Research 19: 2329 - 2343. <br /> <br /> 88. Liao, L., Green, C. T., Bekins, B. A., & Böhlke, J. K., 2012. Factors controlling nitrate fluxes in groundwater in agricultural areas. Water Resources Research 48: W00L09. <br /> <br /> 89. Lin, C. J., Shetty, S. K., Pan, L., Pongprueksa, P., Jang, C., & Chu, H. W., 2012. Source attribution for mercury deposition in the contiguous United States: Regional difference and seasonal variation. J Air & Waste Management Association 62(1): 52 - 63.<br /> <br /> 90. Lutz, B. D., Mulholland, P. J., & Bernhardt, E. S., 2012. Long-term data reveal patterns and controls on stream water chemistry in a forested stream: Walker Branch, Tennessee. Ecological Monographs 82(3): 367 - 387. <br /> <br /> 91. Mallikarachchi, T. D. 2012. Exfiltration trenches for post construction storm water management for linear transportation projects: site investigation on metal removal. Masters thesis, Ohio University, Civil Engineering (Engineering and Technology), 231 pp.<br /> <br /> 92. Marshall, B. D., Moscati, R. J., & Patterson, G. L., 2012. Fluid geochemistry of Yucca Mountain and vicinity. Hydrology and Geochemistry of Yucca Mountain and Vicinity, Southern Nevada and California, 143. <br /> <br /> 93. Mason, R. P., 2012. A framework for a mercury monitoring and assessment program. Mercury in the Environment: Pattern and Process, 81. <br /> <br /> 94. McCrackin, M. L., & Elser, J. J., 2012. Denitrification kinetics and denitrifier abundances in sediments of lakes receiving atmospheric nitrogen deposition (Colorado, USA). Biogeochemistry 108: 39 - 54.<br /> <br /> 95. McLauchlan, K. K., & Craine, J. M., 2012. Species-specific trajectories of nitrogen isotopes in Indiana hardwood forests, USA. Biogeosciences 9: 867 - 874.<br /> <br /> 96. Metcalf, J., & Mose, D. G., 2012. Monitoring sources of mercury in the atmosphere. Proceedings of the Annual International Conference on Soils, Sediments, Water & Energy: Vol. 17, Article 4.<br /> <br /> 97. Minogue, P. J., Miwa, M., Rockwood, D. L., & Mackowiak, C. L., 2012. Removal of nitrogen and phosphorus by Eucalyptus and Populus at a tertiary treated municipal wastewater sprayfield. International J of Phytoremediation 14(10): 1010 - 1023. <br /> <br /> 98. Mladenov, N., Williams, M. W., Schmidt, S. K., & Cawley, K., 2012. Atmospheric deposition as a source of carbon and nutrients to an alpine catchment of the Colorado Rocky Mountains. Biogeosciences 9: 3337 - 3355. <br /> <br /> 99. Montgomery, E. L., Calle, L. M., Curran, J. C., & Kolody, M. R. 2012. Timescale correlation between marine atmospheric exposure and accelerated corrosion testing - part 2. National Aeronotics and Space Administration, Technical Report # KSC-2012-049, 17 pp.<br /> <br /> 100. Moore, C. W., & Castro, M. S., 2012. Investigation of factors affecting gaseous mercury concentrations in soils. Science of the Total Environment 419: 136 - 143.<br /> <br /> 101. Moore, G. W., Barre, D. A., & Owens, M. K., 2012. Does shrub removal increase groundwater recharge in southwestern Texas semiarid rangelands? Rangeland Ecology & Management 65(1): 1 - 10. <br /> <br /> 102. Moore, J., Lichtner, P. C., White, A. F., & Brantley, S. L., 2012. Using a reactive transport model to elucidate differences between laboratory and field dissolution rates in regolith. Geochimica et Cosmochimica Acta 93: 235 - 261.<br /> <br /> 103. Morano, S., Stewart, K. M., Sedinger, J. S., Nicolai, C. A., & Vavra, M., 2012. Life-history strategies of North American elk: Trade-offs associated with reproduction and survival. J Mammalogy, (in press).<br /> <br /> 104. Nair, U. S., Wu, Y., Walters, J., Jansen, J., & Edgerton, E. S., 2012. Diurnal and seasonal variation of mercury species at coastal-suburban, urban, and rural sites in the southeastern United States. Atmospheric Environment 47: 499 - 508.<br /> <br /> 105. Nanus, L., Clow, D. W., Saros, J. E., Stephens, V. C., & Campbell, D. H., 2012. Mapping critical loads of nitrogen deposition for aquatic ecosystems in the Rocky Mountains, USA. Environmental Pollution 166: 125 - 135.<br /> <br /> 106. Nasr, M., Malloch, D. D., & Arp, P. A. Quantifying hg within ectomycorrhizal fruiting bodies, from emergence to senescence. Fungal Biology 116: 1163 - 1177.<br /> <br /> 107. Nikopoulou, Z., Cullinane, K., & Jensen, A., 2012. The role of a cap-and-trade market in reducing NOx and SOx emissions: prospects and benefits for ships within the northern european ECA. Proceedings of the Institution of Mechanical Engineers, Part M: J Engineering for the Maritime Environment, (in press).<br /> <br /> 108. Obrist, D., 2012. Mercury distribution across 14 US forests, part II: patterns of methyl mercury concentrations and areal mass of total and methyl mercury. Environmental Science & Technology 46(11): 5921 - 5930. <br /> <br /> 109. O'Driscoll, M. A., 2012. The 1909 North Carolina drainage act and agricultural drainage effects in eastern North Carolina. Journal of North Carolina Academy of Science 128(3): 59-73. <br /> <br /> 110. Olson, J. R., 2012. The influence of geology and other environmental factors on stream water chemistry and benthic invertebrate assemblages. Doctoral dissertation, Utah State University, May. All Graduate Theses and Dissertations. Paper 1327, 162 pp. http://digitalcommons.usu.edu/etd/1327.<br /> <br /> 111. Olson, J. R., & Hawkins, C. P., 2012. Predicting natural base-flow stream water chemistry in the western United States. Water Resources Research 48(2): W02504.<br /> <br /> 112. Peters, E., Wythers, K., Bradford, J., & Reich, P., 2012. Influence of disturbance on temperate forest productivity. Ecosystems (online) 1 - 16. <br /> <br /> 113. Phillis, C. C., O.Regan, S. M., Green, S. J., Bruce, J. E. B., Anderson, S. C., Linton, J. N., et al., 2012. Multiple pathways to conservation success. Conservation Letters doi: 10.1111/j.1755-263X.2012.00294.x. <br /> <br /> 114. Peterson, C., Alishahi, M., & Gustin, M. S., 2012. Testing the use of passive sampling systems for understanding air mercury concentrations and dry deposition across Florida, USA. Science of the Total Environment 424: 297 - 307.<br /> <br /> 115. Poulette, M. M., 2012. Ecosystem impacts of the invasive shrub Lonicera Maackii are influence by associations with native tree species. Doctoral dissertation, University of Kentucky, 196 pp., http://uknowledge.uky.edu/biology_etds/6.<br /> <br /> 116. Price, J. R., Hardy, C. R., Tefend, K. S., & Szymanski, D. W., 2012. Solute geochemical mass-balances and mineral weathering rates in small watersheds II: biomass nutrient uptake, more equations in more unknowns, and land use/land cover effects. Applied Geochemistry 27: 1247 - 1265.<br /> <br /> 117. Qi, Z., Bartling, P. N., Ahuja, L. R., Derner, J. D., Dunn, G. H., & Ma, L., 2012. Development and evaluation of the carbon - nitrogen cycle module for the GPFARM-Range model. Computers & Electronics in Agriculture 83: 1 - 10.<br /> <br /> 118. Reynolds, K. M., Hessburg, P. F., Sullivan, T., Povak, N., McDonnell, T., Cosby, B., & Jackson, W., 2012. Spatial decision support for assessing impacts of atmospheric sulfur deposition on aquatic ecosystems in the Southern Appalachian Region. In System Science (HICSS), 2012 45th Hawaii International Conference on System Sciences, pp. 1197 - 1206.<br /> <br /> 119. Risch, M. R., DeWild, J. F., Krabbenhoft, D. P., Kolka, R. K., & Zhang, L., 2012. Litterfall mercury dry deposition in the eastern USA. Environmental Pollution 161: 284 - 290. <br /> <br /> 120. Risch, M. R., Gay, D. A., Fowler, K. K., Keeler, G. J., Backus, S. M., Blanchard, P., et al., 2012. Spatial patterns and temporal trends in mercury concentrations, precipitation depths, and mercury wet deposition in the North American great lakes region, 2002 - 2008. Environmental Pollution 161: 261 - 271. <br /> <br /> 121. Rolison, C. J., 2012. Soil nitrification and mineralization rates along an elevation gradient in the Great Smoky Mountains National Park. Master's thesis, University of Tennessee, http://trace.tennessee.edu/utk_gradthes/1199.<br /> <br /> 122. Rueda-Holgado, F., Bernalte, E., Palomo-Marín, M. R., Calvo-Blázquez, L., Cereceda-Balic, F., & Pinilla-Gil, E. Miniaturized voltammetric stripping on screen printed gold electrodes for field determination of copper in atmospheric deposition. Talanta 101(11): 435 - 439.<br /> <br /> 123. Ruiz Diaz, D. A., Mengel, D. B., Lamond, R. E., Duncan, S. R., Whitney, D. A., & Maxwell, T. M., 2012. Meta-analysis of winter wheat response to chloride fertilization in Kansas. Communications in Soil Science & Plant Analysis 43(18): 2437 - 2447. <br /> <br /> 124. SanClements, M. D., Oelsner, G. P., McKnight, D. M., Stoddard, J. L., & Nelson, S. J., 2012. New insights into the source of decadal increases of dissolved organic matter in acid-sensitive lakes of the northeastern United States. Environmental Science & Technology 46(6): 3212 - 3219. <br /> <br /> 125. Scanlon, B. R., Reedy, R., Strassberg, G., Huang, Y., & Senay, G., 2012. Estimation of groundwater recharge to the Gulf Coast aquifer in Texas, USA: final contract report to Texas water development board. University of Texas at Austin, Bureau of Economic Geology, Jackson School of Geoscience 128 pp. <br /> <br /> 126. Schlenker, K., & Filardi, C., 2012. Wilderness character monitoring report Hyalite Porcupine Buffalo Horn Wilderness study area. U.S. Forest Service, Region 1, Gallatin National Forest, 111 pp.<br /> <br /> 127. Scudder Eikenberry, B.C., Riva-Murray, K., Smith, M. J., Bradley, P. M., Button, D. T., Clark, J. M., Burns, D. A., & Journey, C. A., 2012. Environmental settings of selected streams sampled for mercury in New York and South Carolina, 2005 - 09: U.S. Geological Survey Open-File Report 2011 - 1318, 36 p., http://pubs.usgs.gov/ofr/2011/1318/. <br /> <br /> 128. Selin, N. E., 2012. Atmospheric chemistry, modeling, and biogeochemistry of mercury. Mercury in the Environment: Pattern and Process, 73. <br /> <br /> 129. Simon, H., Baker, K. R., & Phillips, S., 2012. Compilation and interpretation of photochemical model performance statistics published between 2006 and 2012. Atmospheric Environment 61: 124 - 139.<br /> <br /> 130. Shrestha, S., & Fang, X. 2012. Application of WARMF model to study the effect of land use change and climate change in the Saugahatchee Creek Watershed. In World Environmental and Water Resources Congress 2012, Crossing Boundaries (pp. 1794 - 1805). ASCE.<br /> <br /> 131. Smeltzer, E., Shambaugh, A. D., & Stangel, P., 2012. Environmental change in lake champlain revealed by long-term monitoring. Journal of Great Lakes Research, 38, Supplement 1, 6 - 18. <br /> <br /> 132. Spence, P. L., Osmond, D. L., Childres, W., Heitman, J. L., & Robarge, W. P., 2012. Effects of lawn maintenance on nutrient losses via overland flow during natural rainfall events. J American Water Resources Association 48(5): 909 - 924.<br /> <br /> 133. State of Maryland, 2012. Watershed report for biological impairment of the Deep Creek Lake watershed in Garrett County, Maryland. Biological Stressor Identification Analysis Results and Interpretation, Revised Final Report, 35 pp.<br /> <br /> 134. Steffen, A., Scherz, T., Olson, M., Gay, D., & Blanchard, P., 2012. A comparison of data quality control protocols for atmospheric mercury speciation measurements. J Environmental Monitoring 14(3): 752 - 765. <br /> <br /> 135. Stephan, K., Kavanagh, K. L., & Koyama, A., 2012. Effects of spring prescribed burning and wildfires on watershed nitrogen dynamics of central Idaho headwater areas. Forest Ecology & Management 263: 240 - 252. <br /> <br /> 136. Straub, D. J., Hutchings, J. W., & Herckes, P., 2012. Measurements of fog composition at a rural site. Atmospheric Environment 47: 195 - 205. <br /> <br /> 137. Strauss, S., Day, T., & Garcia-Pichel, F., 2012. Nitrogen cycling in desert biological soil crusts across biogeographic regions in the southwestern United States. Biogeochemistry 108(1): 171 - 182. <br /> <br /> 138. Stuckless, J. S., 2012. Hydrology and geochemistry of Yucca Mountain and vicinity, southern Nevada and California. Geological Society of America Memoir 209, p 1 - 7.<br /> <br /> 139. Sullivan, T. J., Cosby, B. J., Driscoll, C. T., McDonnell, T. C., Herlihy, A. T., & Burns, D. A., 2012. Target loads of atmospheric sulfur and nitrogen deposition for protection of acid sensitive aquatic resources in the Adirondack Mountains, New York. Water Resources Research 48(1): W01547.<br /> <br /> 140. Sullivan, T., Cosby, B., McDonnell, T., Porter, E., Blett, T., Haeuber, R., et al., 2012. Critical loads of acidity to protect and restore acid-sensitive streams in Virginia and West Virginia. Water, Air, & Soil Pollution 223: 5759 - 5771, doi:10.1007/s11270-012-1312-4.<br /> <br /> 141. Sverdrup, H., McDonnell, T. C., Sullivan, T. J., Nihlgård, B., Belyazid, S., Rihm, B., ... & Geiser, L., 2012. Testing the feasibility of using the ForSAFE-VEG model to map the critical load of nitrogen to protect plant biodiversity in the Rocky Mountains region, USA. Water, Air, & Soil Pollution 223(1): 371 - 387. <br /> <br /> 142. Tank, S. E., Frey, K. E., Striegl, R. G., Raymond, P. A., Holmes, R. M., McClelland, J. W., & Peterson, B. J., 2012. Landscape-level controls on dissolved carbon flux from diverse catchments of the circumboreal. Global Biogeochemical Cycles 26: GB0E02. <br /> <br /> 143. Taylor, A., 2012. Phosphorus mass balance for hypertrophic Grand Lake St. Marys, Ohio. Doctoral dissertation, Wright State University, 96 pp.<br /> <br /> 144. Templer, P. H., Pinder, R. W., & Goodale, C. L., 2012. Effects of nitrogen deposition on greenhouse-gas fluxes for forests and grasslands of North America. Frontiers in Ecology and the Environment 10(10): 547 - 553.<br /> <br /> 145. Trammell, T. L., Ralston, H. A., Scroggins, S. A., & Carreiro, M. M., 2012. Foliar production and decomposition rates in urban forests invaded by the exotic invasive shrub, Lonicera maackii. Biological Invasions 14(3): 529 - 545.<br /> <br /> 146. Uejio, C. K., Peters, T. W., & Patz, J. A., 2012. Inland lake indicator bacteria: long-term impervious surface and weather influences and a predictive bayesian model. Lake & Reservoir Management 28(3): 232 - 244. <br /> <br /> 147. U.S. Department of Agriculture-Forest Service, 2012. Air program national accomplishments and successes, 2010. USDA-Forest Service, Air Resource Management Program National Report, 23 pp. <br /> <br /> 148. Van Metre, P. C., 2012. Increased atmospheric deposition of mercury in reference lakes near major urban areas. Environmental Pollution 162: 209 - 215. <br /> <br /> 149. Volk, J. A., Scudlark, J. R., Savidge, K. B., Andres, A. S., Stenger, R. J., & Ullman, W. J., 2012. Intra- and inter-annual trends in phosphorus loads and comparison with nitrogen loads to Rehoboth Bay, Delaware (USA). Estuarine, Coastal & Shelf Science 96(1): 139 - 150. <br /> <br /> 150. Walker, J. T., Dombek, T., Green, L., Gartman, N., & Lehmann, C., 2012. Stability of organic nitrogen in NADP wet deposition samples. Atmospheric Environment 60: 573 - 582. <br /> <br /> 151. Waller, K., Driscoll, C., Lynch, J., Newcomb, D., & Roy, K., 2012. Long-term recovery of lakes in the Adirondack region of New York to decreases in acidic deposition. Atmospheric Environment 46: 56 - 64. <br /> <br /> 152. Wang, K., & Zhang, Y., 2012. Application, evaluation, and process analysis of the US EPAs 2002 Multiple-Pollutant Air Quality Modeling platform. Atmospheric & Climate Sciences 2(3): 254 - 289. <br /> <br /> 153. Warrender, R., Bowell, R., Prestia, A., Barnes, A., Mansanares, W., & Miller, M., 2012. The application of predictive geochemical modelling to determine backfill requirements at turquoise ridge joint venture, Nevada. Geochemistry: Exploration, Environment, Analysis 12(4): 339 - 347. <br /> <br /> 154. Welker, J. M., 2012. ENSO effects on ´18O, ´2H and dexcess values in precipitation across the US using a highdensity, longterm network (USNIP). Rapid Communications in Mass Spectrometry 26(17): 1893 - 1898. <br /> <br /> 155. Wetherbee, G. A., Gay, D. A., Debey, T. M., Lehmann, C. M. B., & Nilles, M. A. Wet deposition of fission-product isotopes to North America from the Fukushima Dai-ichi incident, March 2011. Environmental Science & Technology 46(5): 2574 - 2582.<br /> <br /> 156. Weiss-Penzias, P. S., Ortiz Jr., C., Acosta, R. P., Heim, W., Ryan, J. P., Fernandez, D., Collett J. L. Jr., & Flegal, A. R., 2012. Total and monomethyl mercury in fog water from the central California coast. Geophysical Research Letters 39: L03804, doi:10.1029/2011GL050324. <br /> <br /> 157. Winder V.L., & Emslie S.D., 2012. Mercury in Nelson's Sparrow subspecies at breeding sites. PLOS <br /> <br /> 158. Winnick, M., Welker, J., & Chamberlain, C., 2012. Stable isotopic evidence of el niño-like atmospheric circulation in the pliocene western United States. Climate of the Past Discussions 8: 5083 - 5108. <br /> <br /> 159. Yager, T. J. B., & McMahon, P. B., 2012. Preliminary assessment of sources of nitrogen in groundwater at a biosolids-application area near Deer Trail, Colorado, 2005. U.S. Geological Survey Scientific Investigations Report 2012 - 5056, 30 pp. <br /> <br /> 160. Yang, Y., Liu, J., Di, Y., Yang, J., Wen, T., Li, Y., et al., 2012. Major ionic composition of precipitation in the Shigatse region, southern Tibetan plateau. Advanced Materials Research 347-353: 1005 - 1011. <br /> <br /> 161. Zhang, L., Blanchard, P., Johnson, D., Dastoor, A., Ryzhkov, A., Lin, C. J., et al., 2012. Assessment of modeled mercury dry deposition over the great lakes region. Environmental Pollution 161: 272 - 283. <br /> <br /> 162. Zhang, L., Blanchard, P., Gay, D. A., Prestbo, E. M., Risch, M. R., Johnson, D., ... & Dalziel, J., 2012. Estimation of speciated and total mercury dry deposition at monitoring locations in eastern and central North America. Atmospheric Chemistry & Physics 12: 4327 - 4340.<br /> <br /> 163. Zhang, L., Jacob, D. J., Knipping, E. M., Kumar, N., Munger, J. W., Carouge, C. C., et al., 2012. Nitrogen deposition to the United States: distribution, sources, and processes. Atmospheric Chemistry & Physics 12(10): 4539 - 4554. <br /> <br /> 164. Zhang, Y., Chen, Y., Sarwar, G., & Schere, K., 2012. Impact of gas-phase mechanisms on Weather Research Forecasting Model with Chemistry (WRF/Chem) predictions: mechanism implementation and comparative evaluation. J Geophysical Research 117(D1): D01301. <br /> <br /> 165. Zhang, Y., Karamchandani, P., Glotfelty, T., Streets, D. G., Grell, G., Nenes, A., ... & Bennartz, R., 2012. Development and initial application of the global-through-urban weather research and forecasting model with chemistry (GU-WRF/Chem). J Geophysical Research 117(D20): D20206. <br /> <br /> 166. Zhang, Y., Jaeglé, L., van Donkelaar, A., Martin, R. V., Holmes, C. D., Amos, H. M., ... & Zsolway, R., 2012. Nested-grid simulation of mercury over North America. Atmospheric Chemistry & Physics 12: 6095 - 6111. <br />

Impact Statements

1. As a National Research Support Project, the NADPs most important impact is that our data are used in research, per our research support mission. From January through December 2012, we identified 166 journal articles and reports that used NADP data, maps, and procedures in their own research; for modeling applications, etc.; and for comparison to NADP results. These articles are included in our online database of NADP publications. Here is a short summary of 11 articles and a listing of theses and dissertations that are of particular interest to the agricultural community.
2. 1) Qi et al. (USDA-ARS scientists) developed a carbon-nitrogen cycle module for use in the Great Plains Framework for Agriculture Resource Management model (GPFARM-Range, simulations of forage growth and cowcalf production). This module predicts crop carbon and soil carbon and nitrogen over time. The model was verified against measurements in Wyoming. The model was developed to be used directly with NADP data; observations of ammonium and nitrate are N inputs to the module and system being evaluated.
3. 2) Carlo and Norris evaluated the uptake of nitrogen directly by flower petals, showing experimentally that flower petals are very effective at capturing and absorbing atmospheric nitrogen deposited by wet deposition. Using simulated rain per the typical concentrations as measured by NADP, N was incorporated rapidly (in hours) and moved into ovaries and seeds (as shown by N isotopes). This N was very efficiently incorporated into the seeds (44%), as opposed to soil (<10%). A range of NADP-observed precipitation concentrations were used in their experiments.
4. 3) Angradi et al. used a straightforward regression model, based upon land use and other sources, to predict the background concentrations of total nitrogen, phosphorus, and suspended solids in the midcontinent Great Rivers (Miss., Ohio, Mo.). These estimates can be used as basic water concentrations before anthropogenic and agricultural additions are made. The modelers used the 20012007 NADP nitrate and ammonium observations over the greater Midwest region as model input.
5. 4) Han and Allen estimated the input of nitrogen to the Lake Michigan Basin from 1880 through 2000, showing six-fold increases until about 1980, and stable levels since that point. This increase corresponds to large increases in nitrogen fertilizers and atmospheric deposition. Nitrogen deposition was the dominant input early (66% of a modest amount), and is still a very significant input (48% currently). The authors used nitrate and ammonium NADP observations from about 40 sites and 25 years to make their estimates.
6. 5) Ketterings et al. (including SAES and Extension scientists) conducted field trials of the application of sulfur-containing fertilizer to alfalfa crops. With application, alfalfa yields increased at several sites, but no increase in diary output was noted. The authors conclude that soil monitoring of S is important for yield increases. NADP observations of S wet deposition from 12 NY sites were used to monitor the input of S to the systems.
7. 6) Lawrence et al. (including USDA and SAES scientists) report early indications of soil recovery from reduced acidic deposition in Northeast forests. Their results suggest the beginnings of pH increases in soils, an ending of calcium loss, decreasing mobilization of aluminum into the B soil horizon, etc. The authors used NADP sulfate and pH observations from five NADP sites from 1985 through 2004.
8. 7) Liao et al. developed a chemical transport model to track the movement of agricultural chemicals (nitrate in particular) into groundwater. The model was tested at 14 sites across the country with a variety of soil and cover crop types. The results show vertical profiles of a number of chemical species. Downward nitrate migration was present at sites with low denitrification rates, and nitrate concentrations in groundwater are, in part, a function of nitrogen application rates. Infiltration rates were determined using several environmental tracers, including chloride. The chloride deposition rates for all sites were developed from long-term NADP Cl observations at each of the sites.
9. 8) Moore et al. (SAES and extension scientists) quantified the change in recharge rates in semiarid rangelands with brush management of the surface. The authors conclude that with removal of brush, modest but significant reductions in evapotranspiration and increases in groundwater recharge are realized. The researchers used nine Texas NADP sites and chloride observations as an environmental tracer to determine accurate recharge rates across the State of Texas.
10. 9) Yager and McMahon compared the sources of groundwater nitrogen from an agricultural biosolids application project in Colorado. Prior to the addition of biosolids, the major N sources, animal manure, inorganic fertilizer, and atmospheric deposition, were all likely important sources. However, after the application, the biosolids were also a major N source, but the authors could not conclude that biosolids were more important than the animal manure. NADP N data were used to determine the atmospheric deposition source strength over time (back to 1983), and chloride values were used to determine infiltration rates.
11. 10) Cai et al. evaluated soil chemistry in a high-elevation forest (TN) to compare trends in soil chemistry to the trends in chemical deposition as measured by NADP. With sulfate deposition decreasing, the soil was not decreasing in sulfate as expected, but still adsorbing sulfate (S sink). This was somewhat surprising, due to the long-term decreasing trend of sulfate (1980 to 2007) in the forest as measured by the NADP site very near the forest.
12. 11) Fernandez et al. (SAES scientists) evaluated the response of corn to sulfur fertilizer addition, noting the serious reduction of sulfur deposition as measured by the NADP program. With field-scale plots, the researchers showed that surface soils had reached their full capacity to supply S to corn, and that sulfate migration from the subsoils or atmospheric deposition of S were required to meet the S needs. Some evidence for increased yield was evident with S application.
13. 12) During this annual review of publications, we were able to identify four Masters theses and eight Doctoral dissertations that used NADP data and information. These are of particular importance, given the educational role that we were able to support with these students. Each reference is listed in the publications section.

Back to top

Report Information

Participants

Allen, Mark - Wisconsin DNR;
Artz, Rick - National Oceanic and Atmospheric Administration;
Bergerhouse, Tom - NADP;
Blanchard, Pierrette - Environment Canada;
Brunette, Bob - Eurofins Frontier Global Sciences;
Burns, Doug - U.S. Geological Survey;
Clark, Chris - U.S. Environmental Protection Administration;
Claybrooke, Roger - NADP;
Gartman, Nina - NADP;
Gay, David - NADP;
Goodman, Keli - National Ecological Observation Network (NEON);
Grant, Rich - Purdue University, SAES;
Green, Lee - NADP;
Hopper, Dr. George - Mississippi State University, SAES;
Huber, Cindy - NADP;
Isil, Selma - AMEC;
Jackson, Dennis - Savannah River National Laboratory;
Jansen, John - Southern Company;
Johnson, Andy - Maine DEP;
Karlstrom, Jason - Eurofins Frontier Global Sciences;
Kerschner, Brian - NADP;
Knipping, Eladio - EPRI;
Larson, Bob - NADP;
Lear, Gary - US EPA;
Lehmann, Chris - NADP;
Lou,Hongyan - NEON;
Ludtke, Amy - USGS;
Lynch, Jason - US EPA;
MacTavish, Dave - Environment Canada;
Means, John - N-CON Instruments;
Morris, Kristi - National Park Service;
Nilles, Mark - USGS;
O'dea, Claire - USDA Forest Service;
Olson, Mark - NADP;
Padgett, Pam - USDA Forest Service;
Peters, Ted - Wisconsin DNR;
Phelan, Jennifer - RTI International;
Pouyat, Rich - USDA Forest Service;
Puchalski, Melissa - US EPA;
Rhodes, Mark - NADP;
Risch, Marty - USGS;
Rodger, Bruce - Wisconsin DNR;
Rogers, Chris - AMEC E&I;
Sams, Charles - USDA Forest Service;
Samson, Nichole - NADP;
Schmeltz, David - US EPA;
Sherwell, John - Maryland Dept. of Natural Resources;
Sullivan, Tim - E&S Environmental;
Tanabe, Richard - Environment Canada;
Taylor, Jeff - NEON;
Tordon, Rob - Environment Canada;
Van der Jagt, Gerard - Eurofins Frontier Global Sciences;
Volk, Lisa - NADP;
Walker, John - US EPA;
Weathers, Kathie - Cary Institute of Ecosystem Studies;
Wetherbee, Greg - USGS;
Wraith, Jon - University of New Hampshire, SAES;
Zhang, Leiming - Environment Canada;
Zuelke, Jay - Louisiana DEQ  retired;

Brief Summary of Minutes

The NADP is comprised of a technical committee (all participants), and a series of subcommittees focusing on specific areas of the ongoing project including operations, quality assurance, ecological response and outreach, data management, an Executive Committee, and several scientific committees. All approved meeting minutes from our 2013 Spring Meeting (and all other meetings) are available on our website (http:// http://nadp.isws.illinois.edu/committees/minutes.aspx). Several of the subcommittee minutes are delayed for approval, but will be posted soon.

The attachment is the minutes of the Joint Subcommittee Meeting (a meeting of all participants, of topics of interest to all).

Accomplishments

Accomplishments<br /> <br /> The NRSP-3 provides a framework for cooperation among State Agricultural Experiment Stations (SAES), the U.S. Department of Agriculture, and other cooperating governmental and non-governmental organizations that support the National Atmospheric Deposition Program (NADP). The NADP provides quality-assured data and information on the exposure of managed and natural ecosystems and cultural resources to acidic compounds, nutrients, base cations, and mercury in precipitation and through dry deposition of several of these compounds. NADP data support informed decisions on air quality and ecosystem issues related to precipitation chemistry.<br /> <br /> Specifically, researchers use NADP data to investigate the impacts of atmospheric deposition on the productivity of managed and natural ecosystems; the chemistry of estuarine, surface, and ground waters; and the biodiversity in forests, shrubs, grasslands, deserts, and alpine vegetation. These research activities address environmental stewardship, one of the Agricultural Experiment Stations research challenges (Science Road Map #6). Researchers also use NADP Mercury Deposition Network data to examine the role of atmospheric deposition in affecting the mercury content of fish, and to better understand the link between environmental and dietary mercury and human health. This fits with another research priority of relationship of food to human health.<br /> <br /> The NADP operates three precipitation chemistry networks: the National Trends Network (NTN), the Atmospheric Integrated Research Monitoring Network (AIRMoN), and the Mercury Deposition Network (MDN). <br /> <br /> The NTN provides the only long-term nationwide record of basic ion wet deposition in the United States. Sample analysis includes free acidity (H+ as pH), specific conductance, and concentration and deposition measurements for calcium, magnesium, sodium, potassium, sulfate, nitrate, chloride, bromide (new), and ammonium. We also measure orthophosphate ions (PO43-, the inorganic form), but only for quality assurance as an indicator of sample contamination. At the end of April 2013, 256 NTN stations were collecting one-week precipitation samples in 48 states, Puerto Rico, the Virgin Islands, Canada, and a new site in Argentina. Additionally, there are multiple quality assurance and test sites. Complementing the NTN is the seven-site AIRMoN. AIRMoN sites are essentially NTN sites operated on a daily basis (i.e., single precipitation events), with samples collected to support continued research of atmospheric transport and removal of air pollutants and development of computer simulations of these processes. <br /> <br /> The 107-site MDN offers the only long-term and routine measurements of mercury in North American precipitation. Measurements of total mercury concentration and deposition (and optional methyl-mercury) are used to quantify mercury deposition to water bodies, some of which have fish and wildlife mercury consumption advisories. Since 2008, every state and 10 Canadian provinces listed advisories warning people to limit fish consumption due to high mercury levels. Coastal advisories are also in place for Atlantic waters from Maine to Rhode Island, from North Carolina to Florida, for the entire U.S. Gulf Coast, and for coastal Hawaii and Alaska.<br /> <br /> The NADP operates two newer gaseous atmospheric chemistry networks: the Atmospheric Mercury Network (AMNet) and the Ammonia Monitoring Network (AMoN, NADPs newest network). In each case, the network goal is to provide atmospheric concentrations of these particular gases, and then to estimate the rate of dry deposition (without precipitation) of the gas. In many cases, dry deposition of the gas could far exceed the wet deposition of the same compound. <br /> <br /> At the end of April 2013, 18 AMNet sites were collecting five-minute estimates of gaseous elemental mercury and two-hourly average concentrations of gaseous oxidized mercury and particulate bound mercury. The AMNet provides the only long-term region-wide record of basic atmospheric mercury concentrations in the United States. <br /> <br /> The AMoN has 58 sites operating as of April 2013, where two-week averages of atmospheric ammonia gas are being collected with passive devices. This low-cost network is designed to provide long-running estimates of ammonia in the atmosphere. These data are particularly important to agriculture, since many sources of ammonia are agricultural in nature (Roadmap Challenge #6). Data from both gaseous networks support continued research of atmospheric transport and removal of air pollutants and development of computer simulations of these processes.<br /> <br /> <br /> Short-term Outcomes and Outputs.<br /> <br /> Samples Collected. NADPs principal objective and accomplishment/outcome is the collection and analysis of samples for precipitation and atmospheric chemistry. Briefly, the NADP processed a total of 7,980 samples from the NTN, including 561 quality assurance (QA) samples. The analyses included observations of 10 different analyte concentrations and precipitation volume, which allow for calculation of deposition flux for each analyte. These same data were collected daily (i.e., every day with measurable precipitation) from the AIRMoN network. AIRMoN collected and processed 611 precipitation samples, including 57 QA samples. The MDN collected and processed 3,901 weekly mercury-in-precipitation samples, including 1,332 QA samples. The AMoN collected and quality assured 1,034 ammonia samples, which included 561 QA samples. The AMNet collected, quality assured, and produced approximately 20,960 hourly and two-hourly averages.<br /> <br /> NADP Database. Our second most important accomplishment/outcome is making data available to all for the support of continued research. Scientists, policymakers, educators, students, and others are encouraged to access data at no charge from the NADP website (http://nadp.isws.illinois.edu). This website offers online retrieval of individual data points, seasonal and annual averages, trend plots, concentration and deposition maps, reports, manuals, and other data and information about the program. As of today, 2011 calendar year data are complete and online, along with data through January 2013, and all of 2012 will be finalized within two weeks. Website usage statistics provide evidence that our data are being used. During FY2012, website usage continued to grow. More than 40,000 registered users accessed our information and records show over 27,800 data downloads from the site. The site annually receives well over 1.25 million hits. We continually divide users into types, and for FY2012 about 40% were from federal and state agencies (somewhat higher than normal), 36% from universities, 16% from K-to-12 schools, and 8% from other individuals or organizations. The NADP website has registered users from more than 150 countries across the globe. These statistics demonstrate that NADP continues to be relevant to both the scientific and educational communities and continues to attract new users.<br /> <br /> Map Summary. As with every year, the 2012 annual maps will be developed during June and available approximately September 2013. These maps are used widely and constitute one of the major products of the network. Individual maps are filed by network, year, and constituent, and can be downloaded in several formats (see examples at http://nadp.isws.illinois.edu/data/annualiso.aspx). Individual maps are compiled into annual Map Summary reports, and the 2011 Map Summary is also available for download (2012 will be available approximately on Sept. 15, 2013; http://nadp.isws.illinois.edu/lib/dataReports.aspx). We printed 2,000 copies of the 2011 Annual Summary, and about 50% of these have been distributed thus far.<br /> <br /> Scientific Meeting (Fall 2012). At the end of each federal year, a combined business and scientific meeting is held to showcase some of the latest deposition research that occurred during the year. During FY12, the meeting focused on The NADP Cooperative: State, Local, and Tribal Perspectives with a goal of focusing more on the non-federal sites and uses of the NADP data (October 21 to 25, 2012 in Portland, Maine). The meeting attracted 130 registered participants, and included eight sessions, 41 oral presentations, and 20 posters. One session was devoted to ammonia monitoring with reference to agriculture, and another session focused on total nitrogen deposition in water bodies and western lands. All presentations, posters, and meeting proceedings are available on the NADP website (http://nadp.isws.illinois.edu/conf/2012/).<br /> <br /> Scientific Meeting (FY13, Fall 2013). The next scientific meeting will be held in Park City, Utah (October 8-11, 2013). An agriculture/ammonia session is planned. All are welcome, with all presentations, posters, and meeting proceedings to be added to the NADP website.<br /> <br /> These basic activities fulfilled the project objectives: (1) coordination of these networks; (2) quality assurance to ensure consistency; and (3) analytical, site support, and data validation services for the sites financed directly through this agreement.<br /> <br /> Additional Operation Notes. The NADP continues to convert our precipitation gages to an all-digital network, originating with a Technical Committee decision in 2006 (http://nadp.isws.illinois.edu/newissues/newgages/newequip.aspx). Currently, the network is operating with approximately 85% new digital networks.<br /> <br /> NADPs fifth network, the Ammonia Monitoring Network (AMoN), is an agricultural-focused network. Ammonia is of great concern regarding agriculture and air pollution. AMoN currently operates 58 sites, and (as of today) 12,000 observations of atmospheric ammonia concentrations are available. AMoNs cost-efficient passive measurements can be used to estimate ammonia dry deposition, a process which is being considered (nadp.isws.illinois.edu/AMoN/).<br /> <br /> The Central Analytical Laboratory has begun to measure the concentration of bromide ion in all NADP samples as a routine analyte of the NTN and AIRMoN sites. Regular measurements will be released for the 2012 year. Bromide is important to agricultural users, given its fumigant usage in the agriculture industry. <br /> <br /> During the 2013 calendar year (as of today, five months), 97 journal articles and reports were generated using the NADP data. These are listed in the Publications section. This is again evidence that NADP is producing data that are both valuable and useful.<br /> At the Spring 2011 Meeting, the NADP committees voted to modify NADP maps from an earlier discrete contour map style to a new continuous color gradient map, and to incorporate much more additional precipitation data (using the Parameter-elevation Regressions on Independent Slopes Model, PRISM). The new map series is now available going back to 1994, and the older-style maps are also still available through 2010. These maps provide much more information to the depositional community by adding precipitation adjustments for elevation and locations. These maps were first published with the 2011 map summary in October 2012. These PRISM data are the result of a research collaboration between the PRISM Research Group at Oregon State University and the USDAs Natural Resource Conservation Service and Forest Service.<br /> U.S. EPA scientists, with NADP, continued special studies to determine whether organic nitrogen deposition can be measured reliably and accurately. The results indicated that the measurements are reliable, and that organic N can be differentiated from inorganic N in our samples. This will add much needed information to the understanding of N deposition patterns and sources.<br /> <br /> A new litterfall mercury monitoring initiative will measure mercury and methyl mercury in forest litterfall (leaves, twigs, etc.). These dry deposition estimates will complement the MDN wet deposition mercury monitoring. Initiation of the trial began in September 2012. Analysis and field support will be provided through the USGS (http://nadp.isws.illinois.edu/newIssues/litterfall/).<br />

Publications

Includes 96 publications that used NADP data or resulted from NRSP 3 activities in 2013 (as of May). A publically available online database that lists citations using NADP data is accessible at: http://nadp.isws.illinois.edu/lib/bibliography.aspx.<br /> <br /> <br /> 1. Barco, J., Gunawan, S., & Hogue, T. S., 2013. Seasonal controls on stream chemical export across diverse coastal watersheds in the USA. Hydrological Processes 27: 14401453, DOI: 10.1002/hyp.9294.<br /> <br /> 2. Bash, J. O., Cooter, E. J., Dennis, R. L., Walker, J. T., & Pleim, J. E., 2013. Evaluation of a regional air-quality model with bidirectional NH 3 exchange coupled to an agroecosystem model. Biogeosciences 10(3): 16351645.<br /> <br /> 3. Becker, C. J., 2013. Groundwater quality and the relation between pH values and occurrence of trace elements and radionuclides in water samples collected from private wells in part of the Kickapoo Tribe of Oklahoma Jurisdictional Area, central Oklahoma, 2011. U.S. Geological Survey Scientific Investigations Report 20125253, 47 p., 5 apps. <br /> <br /> 4. Bettez, N. D., & Groffman, P. M., 2013. Nitrogen deposition in and near an urban ecosystem. Environmental Science & Technology, dx.doi.org/10.1021/es400664b. <br /> <br /> 5. Bettez, N. D., Marino, R., Howarth, R. W., & Davidson, E. A., 2013. Roads as nitrogen deposition hot spots. Biogeochemistry, DOI: 10.1007/s10533-013-9847-z. <br /> <br /> 6. Blesh, J., & Drinkwater, L. E., 2013. The impact of nitrogen source and crop rotation on nitrogen mass balances in the Mississippi River basin. Ecological Applications, http://dx.doi.org/10.1890/12-0132.1. <br /> <br /> 7. Brahney, J., Ballantyne, A. P., Sievers, C., & Neff, J. C., 2013. Increasing Ca2+ deposition in the western US: The role of mineral aerosols. Aeolian Research, http://dx.doi.org/10.1016/j.aeolia.2013.04.003. <br /> <br /> 8. Buzzelli, C., Wan, Y., Doering, P. H., & Boyer, J. N., 2013. Seasonal dissolved inorganic nitrogen and phosphorus budgets for two sub-tropical estuaries in south Florida, USA. Biogeosciences Discussions 10: 23772413. <br /> <br /> 9. Cao, J., Tie, X., Dabberdt, W. F., Jie, T., Zhao, Z., An, Z., & Shen, Z., 2013. On the potential high acid deposition in northeastern China. Journal of Geophysical Research: Atmospheres 118: 113, doi:10.1002/jgrd.50381, 2013. <br /> <br /> 10. Chanat, J. G., Miller, C. V., Bell, J. M., Majedi, B. F., & Brower, D. P., 2013. Summary and interpretation of discrete and continuous water-quality monitoring data, Mattawoman Creek, Charles County, Maryland, 200011: U.S. Geological Survey Scientific Investigations Report 20125265, 42 p. <br /> <br /> 11. Chen, S. M., Qiu, X., Zhang, L., Yang, F., & Blanchard, P., 2013. Method development estimating ambient mercury concentration from monitored mercury wet deposition. Atmospheric Chemistry and Physics Discussions 13(5): 1277112796. <br /> <br /> 12. Cheng, I., Zhang, L., Blanchard, P., Dalziel, J., & Tordon, R., 2013. Concentration-weighted trajectory approach to identifying sources of speciated atmospheric mercury at an urban coastal site in Nova Scotia, Canada. Atmospheric Chemistry & Physics Discussions 13: 41834219. <br /> <br /> 13. Cowles, M. K., 2013. Regression and hierarchical regression models. In Applied Bayesian Statistics (pp. 179-205). Springer New York. <br /> <br /> 14. Curtis, L. R., Morgans, D. L., Thoms, B., & Villenueve, D., 2013. Extreme precipitation appears a key driver of mercury transport from the watershed to Cottage Grove Reservoir, Oregon. Environmental Pollution 176: 178184. <br /> <br /> 15. Cusack, D. F., 2013. Soil nitrogen levels are linked to decomposition enzyme activities along an urban-remote tropical forest gradient. Soil Biology and Biochemistry 57: 192203. <br /> <br /> 16. Dodson, J., 2013. Draft TMDL Report: Springs Coast Basin, Weeki Wachee Spring and Weeki Wachee River (WBIDs 1382B and 1382F), Nutrients, June 2013. <br /> <br /> 17. Drenner, R. W., Chumchal, M. M., Jones, C., Lehmann, C. M., Gay, D., & Donato, D., 2013. Effects of mercury deposition and coniferous forests on the mercury contamination of fish in the south central United States. Environmental Science & Technology 47 (3): 12741279, DOI: 10.1021/es303734n. <br /> <br /> 18. Duarte, N., Pardo, L. H., & Robin-Abbott, M. J., 2013. Susceptibility of forests in the northeastern USA to nitrogen and sulfur deposition: Critical load exceedance and forest health. Water, Air, & Soil Pollution 224(2): 121. <br /> <br /> 19. Ellis, R. A., Jacob, D. J., Payer, M., Zhang, L., Holmes, C. D., Schichtel, B. A., ... & Lynch, J. A., 2013. Present and future nitrogen deposition to national parks in the United States: Critical load exceedances. Atmospheric Chemistry and Physics Discussions 13(4): 91519178. <br /> <br /> 20. Environmental Protection Agency, 2013. At a Glance, Environmental and Health Results Report: Clean Air Interstate Rule, Acid Rain Program, and Former NOx Budget Trading Program, http://www.epa.gov/AIRMARKETS/progress/ARPCAIR11_downloads/ARPCAIR11_environmental_health.pdf. <br /> <br /> 21. Fenn, M. E., Ross, C. S., Schilling, S. L., Baccus, W. D., Larrabee, M. A., & Lofgren, R. A., 2013. Atmospheric deposition of nitrogen and sulfur and preferential canopy consumption of nitrate in forests of the Pacific Northwest, USA. Forest Ecology and Management 302: 240253. <br /> <br /> 22. Fleming, C. S., 2013. Nitrogen and Phosphorus Management in the Mid-Atlantic (Doctoral dissertation, Virginia Polytechnic Institute and State University). <br /> <br /> 23. Gall, H. E., Park, J., Harman, C. J., Jawitz, J. W., & Rao, P. S. C., 2013. Landscape filtering of hydrologic and biogeochemical responses in managed catchments. Landscape Ecology 28:651664, DOI: 10.1007/s10980-012-9829-x. <br /> <br /> 24. Goodsite, M. E., Outridge, P. M., Christensen, J. H., Dastoor, A., Muir, D., Travnikov, O., & Wilson, S., 2013. How well do environmental archives of atmospheric mercury deposition in the Arctic reproduce rates and trends depicted by atmospheric models and measurements? Science of the Total Environment 452: 196207. <br /> <br /> 25. Grant, R. F., 2013. Modelling changes in nitrogen cycling to sustain increases in forest productivity under elevated atmospheric CO 2 and contrasting site conditions. Biogeosciences Discussions 10(4): 67836837. <br /> <br /> 26. Grant, R. H., 2013. Atmospheric wet deposition relationships to season and precipitation in south western Indiana. In Proceedings of the Indiana Academy of Science 97: 497508. <br /> <br /> 27. Guretzky, J. A., Schacht, W., Snell, L., Soper, J., Moore, S., Watson, A., & Klopfenstein, T., 2013. Nitrogen input effects on herbage accumulation and presence of pasture plant species. Agronomy Journal 105: 915921, DOI:10.2134/agronj2012.0458. <br /> <br /> 28. Gichuki, S. W., & Mason, R. P., 2013. Mercury and metals in South African precipitation. Atmospheric Environment, DOI: 10.1016/j.atmosenv.2013.04.009. <br /> <br /> 29. Giese, M., Brueck, H., Gao, Y. Z., Lin, S., Steffens, M., Kögel-Knabner, I., ... & Han, X. G., 2013. N balance and cycling of Inner Mongolia typical steppe: A comprehensive case study of grazing effects. Ecological Monographs 83(2): 195219. <br /> <br /> 30. Glibert, P. M., Hinkle, D. C., Sturgis, B., & Jesien, R. V., 2013. Eutrophication of a Maryland/Virginia coastal lagoon: A tipping point. Ecosystem Changes, and Potential Causes. Estuaries and Coasts, 1-19, DOI: 10.1007/s12237-013-9630-3. <br /> <br /> 31. Gustin, M. S., Huang, J., Miller, M. B., Peterson, C., Jaffe, D. A., Ambrose, J., Finley, B.D., Lyman, S.N., Call, K., Talbot, R., Feddersen, D., Mao, H., and Lindberg, S. E., 2013. Do we understand what the mercury speciation instruments are actually measuring? Results of RAMIX. Environmental Science & Technology, dx.doi.org/10.1021/es3039104. <br /> <br /> 32. Gustin, M., Weiss-Penzias, P. S., & Peterson, C., 2012. Investigating sources of gaseous oxidized mercury in dry deposition at three sites across Florida, USA. Atmospheric Chemistry and Physics 12(19): 92019219 (not previously listed). <br /> <br /> 33. Hale, R. L., Hoover, J. H., Wollheim, W. M., & Vörösmarty, C. J., 2013. History of nutrient inputs to the Northeastern United States, 19302000. Global Biogeochemical Cycles, DOI: 10.1002/gbc.20049. <br /> <br /> 34. Heckel, P. F., Keener, T. C., & LeMasters, G. K., 2013. Background Soil Mercury: An Unrecognized Source of Blood Mercury in Infants? Open Journal of Soil Science 3: 2329. <br /> <br /> 35. Houlton, B., Boyer, E., Finzi, A., Galloway, J., Leach, A., Liptzin, D., et al., 2013. Intentional versus unintentional nitrogen use in the United States: Trends, efficiency and implications. Biogeochemistry, DOI: 10.1002/gbc.20049. <br /> <br /> 36. Inglett, P. W., & Inglett, K. S., 2013. Biogeochemical changes during early development of restored calcareous wetland soils. Geoderma 192: 132141. <br /> <br /> 37. Jicha, T. M., Johnson, L. B., Hill, B. H., Regal, R. R., Elonen, C. M., & Pearson, M. S., 2013. Spatial and temporal patterns of nitrification rates in forested floodplain wetland soils of upper Mississippi River Pool 8. River Research and Applications, DOI: 10.1002/rra.2663. <br /> <br /> 38. Jones, G. B., 2013. Nutrient Dynamics in Cool-Season Pastures (Doctoral dissertation, Virginia Polytechnic Institute and State University). <br /> <br /> 39. Keimowitz, A. R., Parisio, S., Adams, M. S., Interlichia, K., Halton, C., Kroenke, S., & Hubert, A., 2013. Identification of Ombrotrophic Bogs in the Catskill Mountains, NY by Geochemical and Isotopic Methods. Wetlands 33: 355364. <br /> <br /> 40. Kim, K. I., Kaiser, D. E., & Lamb, J., 2013. Corn response to starter fertilizer and broadcast sulfur evaluated using strip trials. Agronomy Journal 105(2): 401411. <br /> <br /> 41. Kos, G., Ryzhkov, A., Dastoor, A., Narayan, J., Steffen, A., Ariya, P. A., & Zhang, L., 2013. Evaluation of discrepancy between measured and modelled oxidized mercury species. Atmos. Chem. Phys. 13: 4839-4863, DOI:10.5194/acp-13-4839-2013. <br /> <br /> 42. Kranabetter, J., Saunders, S., MacKinnon, J., Klassen, H., & Spittlehouse, D., 2013. An assessment of contemporary and historic nitrogen availability in contrasting coastal douglas-fir forests through ´15N of tree rings. Ecosystems, DOI: 10.1007/s10021-012-9598-z. <br /> <br /> 43. Lajtha, K., & Jones, J., 2013. Trends in cation, nitrogen, sulfate and hydrogen ion concentrations in precipitation in the United States and Europe from 1978 to 2010: A new look at an old problem. Biogeochemistry, DOI: 10.1007/s10533-013-9860-2. <br /> <br /> 44. Lamborg, C. H., Engstrom, D. R., Fitzgerald, W. F., & Balcom, P. H., 2013. Apportioning global and non-global components of mercury deposition through 210Pb indexing. Science of the Total Environment 448: 132140. <br /> <br /> 45. Lei, H., Liang, X.-Z., Wuebbles, D. J., & Tao, Z., 2013. Model analyses of atmospheric mercury: present air quality and effects of transpacific transport on the United States, Atmos. Chem. Phys. Discuss. 13: 9849-9893, DOI:10.5194/acpd-13-9849-2013. <br /> <br /> 46. Lessard, C. R., Poulain, A. J., Ridal, J. J., & Blais, J. M., 2013. Steady-state mass balance model for mercury in the St. Lawrence River near Cornwall, Ontario, Canada. Environmental Pollution 174: 229235. <br /> <br /> 47. Levengood, J. M., Soucek, D. J., Taylor, C. A., & Gay, D. A., 2013. Mercury in small Illinois fishes: Historical perspectives and current issues. Environmental monitoring and assessment, DOI: 10.1007/s10661-012-3040-z. <br /> <br /> 48. Liptzin, D., Daley, M. L., & McDowell, W. H., 2013. A comparison of wet deposition collectors at a coastal rural site. Water, Air, & Soil Pollution 224(5): 110. <br /> <br /> 49. Liu, B., Kang, S., Sun, J., Zhang, Y., Xu, R., Wang, Y., ... & Cong, Z., 2013. Wet precipitation chemistry at a high-altitude site (3,326 m asl) in the southeastern Tibetan Plateau. Environmental Science and Pollution Research, DOI: 10.1007/s11356-012-1379-x. <br /> <br /> 50. Liu, X. H., & Zhang, Y., 2013. Understanding of the formation mechanisms of ozone and particulate matter at a fine scale over the southeastern U.S.: Process analyses and responses to future-year emissions. Atmospheric Environment 74: 259276. <br /> <br /> 51. Lupo, C. D., & Stone, J. J., 2013. Bulk atmospheric mercury fluxes for the Northern Great Plains, USA. Water, Air, & Soil Pollution 224(2): 112. <br /> <br /> 52. Mast, M. A., 2013. Evaluation of stream chemistry trends in U.S. Geological Survey reference watersheds, 19702010. Environmental Monitoring and Assessment, DOI: 10.1007/s10661-013-3256-6. <br /> <br /> 53. Mast, M. A., & Ely, D., 2013. Effect of power plant emission reductions on a nearby wilderness area: A case study in northwestern Colorado. Environmental Monitoring and Assessment, DOI: 10.1007/s10661-013-3086-6. <br /> <br /> 54. Mattieu, C. A., Furl, C. V., Roberts, T. M., & Friese, M., 2013. Spatial trends and factors affecting mercury bioaccumulation in freshwater fishes of Washington State, USA. Archives of Environmental Contamination and Toxicology, DOI: 10.1007/s00244-013-9882-8. <br /> <br /> 55. McCrackin, M. L., Harrison, J. A., & Compton, J. E., 2013. A comparison of NEWS and SPARROW models to understand sources of nitrogen delivered to U.S. coastal areas. Biogeochemistry, DOI: 10.1007/s10533-012-9809-x. <br /> <br /> 56. McMurray, J. A., Roberts, D. W., Fenn, M. E., Geiser, L. H., & Jovan, S., 2013. Using Epiphytic Lichens to Monitor Nitrogen Deposition Near Natural Gas Drilling Operations in the Wind River Range, WY, USA. Water, Air, & Soil Pollution 224(3): 114. <br /> <br /> 57. Mitchell, M. J., Driscoll, C. T., McHale, P. J., Roy, K. M., & Dong, Z., 2013. Lake/watershed sulfur budgets and their response to decreases in atmospheric sulfur deposition: Watershed and climate controls. Hydrological Processes 27: 710720, DOI: 10.1002/hyp.9670. <br /> <br /> 58. Mladenov, N., Williams, M. W., Schmidt, S. K., & Cawley, K., 2012. Atmospheric deposition as a source of carbon and nutrients to barren, alpine soils of the Colorado Rocky Mountains. Biogeosciences Discussions 9(3): 23752424 (not previously recorded). <br /> <br /> 59. Myers, T., Atkinson, R. D., Bullock Jr., O. R., & Bash, J. O., 2013. Investigation of effects of varying model inputs on mercury deposition estimates in the Southwest U.S. Atmos. Chem. Phys. 13: 9971009. <br /> <br /> 60. Nair, U. S., Wu, Y., Holmes, C. D., Ter Schure, A., Kallos, G., & Walters, J. T., 2013. Cloud-resolving simulations of mercury scavenging and deposition in thunderstorms. Atmospheric Chemistry & Physics Discussions 13: 35753611. <br /> <br /> 61. Nelson, J. A., Stallings, C. D., Landing, W. M., & Chanton, J., 2013. Biomass transfer subsidizes nitrogen to offshore food webs. Ecosystems, DOI: 10.1007/s10021-013-9672-1. <br /> <br /> 62. Nippert, J. B., Culbertson, T. S. F., Orozco, G. L. Ocheltree, T. W., & Helliker, B. R., 2013. Identifying the water sources consumed by bison: Implications for large mammalian grazers worldwide. Ecosphere 4(2) article 23, http://dx.doi.org/10.1890/ES12-00359.1. <br /> <br /> 63. Nimick, D. A., Caldwell, R. R., Skaar, D. R., & Selch, T. M., 2013. Fate of geothermal mercury from Yellowstone National Park in the Madison and Missouri Rivers, USA. Science of the Total Environment 443: 4054. <br /> <br /> 64. Olson, J. R., & Hawkins, C. P., 2013. Developing site-specific nutrient criteria from empirical models. Freshwater Science 32(3): 719740. <br /> <br /> 65. Park, J., Gall, H. E., Niyogi, D., & Rao, P. S. C., 2013. Temporal trajectories of wet deposition across hydro-climatic regimes: Role of urbanization and regulations at U.S. and East Asia sites. Atmospheric Environment 70: 280288. <br /> <br /> 66. Paulot, F., Jacob, D. J., & Henze, D. K., 2013. Sources and processes contributing to nitrogen deposition: An adjoint model analysis applied to biodiversity hotspots worldwide. Environmental Science & Technology 47: 32263233. <br /> <br /> 67. Perakis, S. S., Sinkhorn, E. R., Catricala, C. E., Bullen, T. D., Fitzpatrick, J., Hynicka, J. D., & Cromack Jr., K., 2013. Forest calcium depletion and biotic retention along a soil nitrogen gradient. Ecological Applications, http://dx.doi.org/10.1890/12-2204.1. <br /> <br /> 68. Perrot, D., Perrot, D. O., Molotch, N. P., Williams, M. W., & Anderson, S. P., 2013. Nitrate export response to spatially distributed snowmelt in alpine catchments (Masters Thesis, University of Colorado). <br /> <br /> 69. Peters, E. B., Wythers, K. R., Bradford, J. B., & Reich, P. B., 2013. Influence of disturbance on temperate forest productivity. Ecosystems 16(1): 95110. <br /> <br /> 70. Poor, N. D., Cross, L. M., & Dennis, R. L., 2013. Lessons learned from the Bay Region Atmospheric Chemistry Experiment (BRACE) and implications for nitrogen management of Tampa Bay. Atmospheric Environment 70: 7583. <br /> <br /> 71. Poor, N. D., Pribble, J. R.,& Schwede, D. B., 2013. Application of watershed deposition tool to estimate from CMAQ simulations the atmospheric deposition of nitrogen to Tampa Bay and its watershed. Journal of the Air & Waste Management Association 63(1): 100114. <br /> <br /> 72. Porter, E., Bowman, W., Clark, C., Compton, J., Pardo, L., & Soong, J. Interactive effects of anthropogenic nitrogen enrichment and climate change on terrestrial and aquatic biodiversity. Biogeochemistry, DOI: 10.1007/s10533-012-9803-3, 1-28. <br /> <br /> 73. Povak, N. A., Hessburg, P. F., Reynolds, K. M., Sullivan, T. J., McDonnell, T. C., & Salter, R. B., 2013. Machine learning and hurdle models improve regional predictions of stream water acid neutralizing capacity. Water Resources Research, DOI: 10.1002/wrcr.20308. <br /> <br /> 74. Price, J. R., Peresolak, K., Brice, R. L., & Tefend, K. S., 2013. Temporal Variability in the Chemical Weathering of Ca2+-Bearing Phases in the Loch Vale Watershed, Colorado, USA: A Mass-Balance Approach. Chemical Geology 342: 151166. <br /> <br /> 75. Rao, P., Hutyra, L. R., Raciti, S. M., & Templer, P. H., 2013. Atmospheric nitrogen inputs and losses along an urbanization gradient from Boston to Harvard Forest, MA. Biogeochemistry, DOI: 10.1007/s10533-013-9861-1. <br /> <br /> 76. Rober, A. R., Wyatt, K. H., Turetsky, M. R., & Stevenson, R. J., 2013. Algal community response to experimental and interannual variation in hydrology in an Alaskan boreal fen. Freshwater Science, 32(1): 111. <br /> <br /> 77. Robichaud, P. R., Lewis, S. A., Wagenbrenner, J. W., Ashmun, L. E., & Brown, R. E., 2013. Post-fire mulching for runoff and erosion mitigation: Part I: Effectiveness at reducing hillslope erosion rates. Catena 105: 7592. <br /> <br /> 78. Santhi, C., Kannan, N., White, M., Di Luzio, M., Arnold, J. G., Wang, X., & Williams, J. R., 2013. An integrated modeling approach for estimating the water quality benefits of conservation practices at the river basin scale. Journal of Environmental Quality, DOI:10.2134/jeq2011.0460. <br /> <br /> 79. Sather, M. E., Mukerjee, S., Smith, L., Mathew, J., Jackson, C., Callison, R., Scrapper, L., Hathcoat, A., Adam, J., Keese, D., Ketcher, P., Brunette, R., Karlstrom, J., & Van der Jagt, G., 2013. Gaseous oxidized mercury dry deposition measurements in the Four Corners area and Eastern Oklahoma, U.S.A. Atmospheric Pollution Research 4: 168180. <br /> <br /> 80. Seo, Y. S., Han, Y. J., Choi, H. D., Holsen, T. M., & Yi, S. M., 2012. Characteristics of total mercury (TM) wet deposition: Scavenging of atmospheric mercury species. Atmospheric Environment 49: 6976 (not previously reported). <br /> <br /> 81. Sheu, G.-R., & Lin, N.-H., Characterizations of wet mercury deposition to a remote islet (Pengjiayu) in the subtropical Northwest Pacific Ocean. Atmospheric Environment, DOI: 10.1016/j.atmosenv.2013.05.038. <br /> <br /> 82. Shim, J. H., Powers H. H., Meyer C. W., & Dawson T. E., 2013. Hydrologic control of the oxygen isotope ratio of ecosystem respiration in a semi-arid woodland. Biogeosciences Discussions 10(108): 148. <br /> <br /> 83. Sorooshian, A., Shingler, T., Harpold, A., Feagles, C. W., Meixner, T., & Brooks, P. D., 2013. Aerosol and precipitation chemistry in the southwestern United States: Spatiotemporal trends and interrelationships. Atmospheric Chemistry and Physics Discussions 13(4): 86158662. <br /> <br /> 84. Skrzypek, G., Paul, D., & WojtuD, B., 2013. The altitudinal climatic effect on the stable isotope compositions of Agave and Opuntia in arid environmentsA case study at the Big Bend National Park, Texas, USA. Journal of Arid Environments 92: 102112. <br /> <br /> 85. Sullivan, P. L., Price, R. M., Miralles-Wilhelm, F., Ross, M. S., Scinto, L. J., Dreschel, T. W., et al., 2013. The role of recharge and evapotranspiration as hydraulic drivers of ion concentrations in shallow groundwater on everglades tree islands, Florida (USA). Hydrological Processes, DOI: 10.1002/hyp.9575. <br /> <br /> 86. Sullivan, P. L., Engel, V., Ross, M. S., & Price, R. M., 2013. The influence of vegetation on the hydrodynamics and geomorphology of a tree island in Everglades National Park (Florida, USA). Ecohydrology, DOI: 10.1002/eco.1394. <br /> <br /> 87. Tang, R. W., Johnston, T. A., Gunn, J. M., & Bhavsar, S. P., 2013. Temporal changes in mercury concentrations of large-bodied fishes in the boreal shield ecoregion of northern Ontario, Canada. Science of the Total Environment 444: 409416. <br /> <br /> 88. Wang, Y., Huang, J., Hopke, P. K., Rattigan, O. V., Chalupa, D. C., Utell, M. J., & Holsen, T. M., 2013. Effect of the shutdown of a large coal-fired power plant on ambient mercury species. Chemosphere 92: 360367. <br /> <br /> 89. Wang, S., Holsen, T. M., Huang, J., & Han, Y. J., 2013. Evaluation of various methods to measure particulate bound mercury and associated artifacts. Atmospheric Chemistry and Physics Discussions 13(4): 85858614. <br /> <br /> 90. Wang, F., Mladenoff, D. J., Forrester, J. A., Keough, C., & Parton, W. J., 2013. Global sensitivity analysis of a modified CENTURY model for simulating impacts of harvesting fine woody biomass for bioenergy. Ecological Modelling 259: 1623. <br /> <br /> 91. Willey, J. D., Mullaugh, K. M., Kieber, R. J., Avery, G. B., & Mead, R. N., 2013. Controls on the redox potential of rainwater. Environmental Science & Technology, dx.doi.org/10.1021/es302569. <br /> <br /> 92. Wollheim, W. M., Green, M. B., Pellerin, B. A., Morse, N. B., & Hopkinson, C. S., 2013. Causes and consequences of ecosystem service regionalization in a coastal suburban watershed. Estuaries and Coasts, DOI: 201310.1007/s12237-013-9646-8. <br /> <br /> 93. Yu, X., Driscoll, C. T., Huang, J., Holsen, T. M., & Blackwell, B. D., 2013. Modeling and Mapping of Atmospheric Mercury Deposition in Adirondack Park, New York. PloS one 8(3): 59322. <br /> <br /> 94. Zhang, Y., & Jaeglé, L., 2013. Decreases in Mercury Wet Deposition over the United States during 20042010: Roles of Domestic and Global Background Emission Reductions. Atmosphere 4(2): 113131. <br /> <br /> 95. Zhang, Y., Xiu, G., Wu, X., Moore, C. W., Wang, J., Cai, J., ... & Zhang, R., 2013. Characterization of mercury concentrations in snow and potential sources, Shanghai, China. Science of the Total Environment 449: 434442.<br /> <br /> 96. Zhu, L., Henze, D. K., CadyPereira, K. E., Shephard, M. W., Luo, M., Pinder, R. W., ... & Jeong, G. R., 2013. Constraining U.S. ammonia emissions using TES remote sensing observations and the GEOSChem adjoint model. Journal of Geophysical Research: Atmospheres. 118: 33553368, DOI:10.1002/jgrd.50166, 2013.<br />

Impact Statements

1. As a National Research Support Project, the NADPs most important impact is that our data are used in research, per our research support mission. From January through May 2013, we identified 97 journal articles and reports that used NADP data, maps, and procedures in their own research, for modeling applications, and for comparison to NADP results, etc. These articles will be included in our online database of NADP publications. Here is a short summary of 10 articles (and theses/dissertations) that are of particular interest to the agricultural community.
2. Brahney et al. used 17 years of calcium wet deposition from 175 NADP sites to show a continual scale increase in calcium deposition. The largest trends are increasing deposition to the intermountain West and to the agricultural Midwest (IA, KS, MO, IL, IN). For the Midwest, the increase was 24% over the 17 years. A decrease was noted across Texas and New Mexico. These observations are consistent with the current Southwest USA extended drought.
3. Blesh and Drinkwater (SAES, Cornell) used farm-scale interviews and a regional model of farm nitrogen usage to evaluate the nitrogen contribution to the Mississippi River nitrogen flux. This small-scale approach captures some of the variability, in part due to crop rotation and nitrogen source types that regional scale models miss. From this, they concluded that crop rotation (increased C availability) and nitrogen fertilizer reduction are necessary to significantly influence N movement to the Gulf of Mexico. The authors used NADP nitrate and ammonia deposition rates over several years and four states for input of N to the particular farms and study areas.
4. Fleming (dissertation, Crop and Soil Environmental Sciences, Virginia Tech) evaluated irrigation techniques and N fertilization application rates to optimize both for the growth of fresh tomatoes. She used NADP seasonal deposition rates of nitrate and ammonia over three years from Maryland as input for her N fertilizer and fruit recovery balances. With her research, she provided improved production protocols for sustained yields, lower irrigation rates, and improved nitrogen application.
5. Guretzky et al. (several SAES scientists, Agronomy, Animal Sciences, UN-Lincoln) investigated the ecosystem response to grazing beef cattle diet supplements (corn, distillery grains) under different N inputs (unfertilized to heavily fertilized). They used NADP inorganic N deposition rates to their experimental lands over two study years, where in unfertilized lands the atmospheric N deposition was the only external N addition. Among other results, the authors concluded that the distillers grain feeding did not affect herbage accumulation over the long term without additional N fertilizer.
6. Jones (thesis, Crop and Soil Environmental Sciences, Virginia Tech) examined temporal changes of soil nutrient concentrations (soil pH, P, N, S, Ca, Mg, K, Fe, Zn, Cu and B) over five years in a beef cattle system, and developed a model to predict changes of these nutrients within herbage over time. He used NADP deposition rates of pH, N, S, Ca, Mg, K, etc. as external inputs to his system. He found higher concentrations of herbage N and K and soil P, K, Fe, Zn, and Cu over time, with lower variability in herbage P and K.
7. Nippert et al. (Kansas State University SAES site) examined the water sources and budgets of wild bison on Konza Prairie using isotopic analysis of their dung. They determined that the bison primarily used puddles and wallows (i.e., atmospheric precipitation) as their major water source. They confirmed this with isotopic analysis of onsite NADP precipitation samples. Implications of climate change to grazing animal primary water sources could have many different effects.
8. Bash et al. evaluated a U.S. EPA air quality model with respect to bi-directional ammonia exchange through incorporation of both NADP wet deposition data and the USDA Environmental Policy Integrated Climate (EPIC) agroecosystem model (soil nitrogen model). EPIC was used to improve the nitrogen/ammonia emissions, and NAPD data from the entire network (monthly and annual sums, for 2002) were used to evaluate the model results. By incorporating the EPIC model, significant model improvement of N aerosol concentration and N deposition was seen.
9. Hale et al. developed a database of nutrient input to northeast ecosystems going back to the 1920s. Atmospheric deposition is a major nutrient source, and they used the full complement of NADP observations from our NE states (41 sites). Very large changes have occurred over these years, due primarily to the urbanization of the NE. The authors concluded that agriculture and particularly livestock were the most important inputs defining spatial nutrient patterns, and changes in these inputs over time changed the NE spatial patterns. Agriculture is still a major input to the nutrient cycling in the region.
10. Santhi et al. (SAES scientists, Texas A&M Univ.; ARS Scientists) developed a physically-based, regional-scale modeling approach to evaluate if agricultural conservation practices are improving the water quality conditions of rivers and streams as part of the USDA-initiated Conservation Effects Assessment Project (CEAP). They used NADP wet deposition inputs of N to their modeling (multiple sites over 18 river basins). Simulations indicated that current practices have the potential to significantly reduce the delivery of sediment, N, and P loads to the Ohio/Mississippi River by 15, 16, and 20%, respectively.
11. Zhu et al. relate values of atmospheric ammonia as a tool to improve the GEOS-Chem air quality models performance in predicting ammonia transport, atmospheric chemical reactions, and deposition. By comparing model output to ground measurements from two NAPD networks (multiple years, all sites) for wet deposition (NADP/NTN) and for gaseous ammonia (NADP/AMoN), the authors significantly increased their precision in resulting ammonia and air quality output in certain months, but other monthly predictions were not improved. This work confirms that predictions of ammonia impacts on air quality still need more improvement.

Back to top

Report Information

Participants

Brief Summary of Minutes

NRSP3 has changed to a spring meeting schedule, so their next annual report will be submitted with their spring 2014 meeting. This report will contain information on 2012 through spring 2014 activities. Please contact David Gay or Doug Buhler with questions."

Accomplishments

Publications

Impact Statements

Back to top

Report Information

Participants

Brief Summary of Minutes

See attached "Copy of Minutes" file for NRSP3's annual report.

Accomplishments

Publications

Impact Statements

Back to top