B12A:
Centennial Challenge: The Bioatmospheric N cycle—N Emissions, Transformations, Deposition, and Terrestrial and Aquatic Ecosystem Impacts I


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Session ID#: 59702

Session Description:
Biogenic and anthropogenic emissions of reactive nitrogen (Nr) are transported, chemically transformed, and deposited on land and waters, altering structure and function of ecosystems and degrading environmental quality. Estimating atmospheric N emissions and deposition, and evaluating ecosystem responses require a diverse array of measurements and models that link processes at multiple scales. We seek presentations on physical, chemical, biological, and anthropogenic processes that drive local, regional and global nitrogen exchange, impacts on ecosystems, carbon uptake, nitrogen export, biodiversity, human health, and policy implications and responses.
Primary Convener:  Stuart B Weiss, Creekside Center for Earth Observation, Menlo Park, CA, United States
Conveners:  Meredith Galanter Hastings, Brown University, Department of Earth, Environmental and Planetary Sciences, Providence, RI, United States, Maya Almaraz, University of California Davis, Joh Muir Institute of the Environment, Davis, United States and Rebecca Ryals, University of California Merced, Department of Life and Environmental Sciences, Merced, United States
Primary Liaison:  Meredith Galanter Hastings, Brown University, Department of Earth, Environmental and Planetary Sciences, Providence, RI, United States
Chairs:  Stuart B Weiss, Creekside Center for Earth Observation, Menlo Park, CA, United States and Meredith Galanter Hastings, Brown University, Department of Earth, Environmental and Planetary Sciences, Providence, RI, United States
OSPA Liaison:  Maya Almaraz, University of California Davis, Joh Muir Institute of the Environment, Davis, United States

Cross-Listed:
  • A - Atmospheric Sciences
  • GC - Global Environmental Change
  • H - Hydrology
  • OS - Ocean Sciences
Index Terms:

0469 Nitrogen cycling [BIOGEOSCIENCES]
0478 Pollution: urban, regional and global [BIOGEOSCIENCES]
1615 Biogeochemical cycles, processes, and modeling [GLOBAL CHANGE]
3322 Land/atmosphere interactions [ATMOSPHERIC PROCESSES]

Abstracts Submitted to this Session:

Atmospheric Nitrogen Deposition and Groundwater Nitrate in a Serpentine Grassland Ecosystem: Nutrient Cycling and Hydrogeologic Processes (444727)
Stuart B Weiss, Creekside Center for Earth Observation, Menlo Park, CA, United States
Fine-tuning in situ measurement of denitrification and biological nitrogen fixation for quantifying nitrogen inputs and outputs in terrestrial ecosystems exposed to enhanced atmospheric reactive nitrogen deposition (390681)
Sami Ullah1, Fotis Sgouridis2, Ernesto Saiz Val3 and Falko Drijfhout3, (1)University of Birmingham, School of Geography, Earth and Environmental Sciences, Birmingham, United Kingdom, (2)University of Bristol, School of Geographical Sciences, Bristol, United Kingdom, (3)University of Keele, Faculty of Natural Sciences, Keele, United Kingdom
Linking water transit times to catchment sensitivity to atmospheric deposition of nitrogen and acidity in mountains of the western United States (395846)
David W Clow, USGS Central Region Offices Denver, Denver, CO, United States, Alisa Mast, USGS Colorado Water Science Center Denver, Denver, CO, United States and James O Sickman, University of California, Riverside, Department of Environmental Sciences, Riverside, CA, United States
Recent advances in critical loads research and understanding vulnerability to N and S deposition across the contiguous U.S. (443747)
Chris Clark, Environmental Protection Agency Arlington, Arlington, VA, United States, Robert Daniel Sabo, U.S. Environmental Protection Agency, Office of Water, Washington, United States, Kevin J. Horn, Virginia Tech University, Blacksburg, United States, Quinn Thomas, Virginia Polytechnic Institute and State University, Forest Resources and Environmental Conservation, Blacksburg, VA, United States, Samuel Simkin, University of Colorado, Boulder, United States, Linda H Pardo, USDA Forest Service, Northern Research Station, Burlington, United States and Michael D Bell, National Park Service, Air Resources Division, Lakewood, United States
A review and synthesis of nitrogen inputs, outputs and dynamics to support the implementation of nitrogen cap reduction in the Lake Rotorua catchment. (453327)
W Troy Baisden1, Christopher G McBride1, James Dare2 and Mathew Allan1, (1)University of Waikato, Environmental Research Institute, Hamilton, New Zealand, (2)Bay of Plenty Regional Council, Mt. Maunganui, New Zealand
Characterizing the contrasting long-term trends in atmospheric nitrogen deposition across the Northern Hemisphere due to changing emission patterns during the 1990-2010 period (393055)
Rohit Mathur, U.S. Environmental Protection Agency, Research Triangle Park, NC, United States, Yuqiang Zhang, Duke University, Durham, NC, United States, Christian Hogrefe, United States Environmental Protection Agency, Office of Research and Development, Research Triangle Park, NC, 27711 13 USA, Research Triangle Park, United States and Jia Xing, Tsinghua University, Beijing, China
Variation in nitrogen fixation and foliar microbial communities driven by conifer host species and site fertility (458580)
Lara M Kueppers, University of California Berkeley, Energy and Resources Group, Berkeley, CA, United States, Dianne Quiroz, University of California Berkeley, Energy and Resources Group, Berkeley, United States, Dana Carper, University of California Merced, Quantitative and Systems Biology, Merced, CA, United States, Paola Saldierna, University of California Merced, Quantitative and Systems Biology, Merced, United States, Jennifer Pett-Ridge, Lawrence Livermore National Laboratory, Livermore, CA, United States and Carolin Frank, University of California Merced, Life and Environmental Sciences, Merced, CA, United States
Looking Beyond Soil Nitrogen as the Primary Regulator of Tropical Symbiotic Nitrogen Fixation (Invited) (370368)
Benton Neil Taylor, Harvard University, Organismic and Evolutionary Biology, Cambridge, MA, United States and Duncan Menge, Columbia University, New York, United States

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