B11A:
Nitrogen at the Interface: The N-Cycle across Physical and Disciplinary Boundaries I
Session ID#: 11477
Session Description:
Nitrogen availability is an important control on ecosystem dynamics in marine realms, from oligotrophic gyres to eutrophic coastal waters. Assessing what controls the rates and distribution of N-cycling processes is therefore of paramount importance for linking nitrogen biogeochemistry to productivity and ecosystem function. Physical interfaces in the ocean are locations where the biology and chemistry of distinct water masses and sediments interact, and appear to be hotspots for N-cycling. This session highlights nitrogen biogeochemistry at aquatic interfaces, including oxic-anoxic transition zones, eddies/fronts, estuaries, and coastal/upwelling regions. Research on N-cycle processes from unique marine interfaces and gradients of any kind is welcomed.
Furthermore, recent advances in our understanding of N-cycling have come from increasingly diverse research fields, such as refined isotopic techniques, unique methods for modeling biogeochemical rates, and novel microbial analyses. In addition to research located at physical interfaces, this session seeks presentations at the “interface” of traditional oceanographic methods. Primary consideration will be given to presentations that incorporate techniques from multiple disciplines, including (but not limited to) isotope geochemistry, microbial ecology, physical oceanography, and marine ecosystem modeling. Therefore, this session will focus on integrating data and ideas across several oceanographic disciplines to holistically understand N-cycling processes at marine interfaces.
Primary Chair: Bradley B Tolar, Stanford University, Earth System Science, Stanford, CA, United States
Chairs: Andrew R Babbin, Massachusetts Institute of Technology, EAPS, Cambridge, MA, United States, Carolyn Buchwald, Woods Hole Oceanographic Institution, Marine Chemistry & Geochemistry, Woods Hole, MA, United States and Julian Damashek, Stanford University, Earth System Science, Stanford, CA, United States
Moderators: Bradley B Tolar1, Andrew R Babbin2, Carolyn Buchwald3 and Julian Damashek1, (1)Stanford University, Earth System Science, Stanford, CA, United States(2)Massachusetts Institute of Technology, EAPS, Cambridge, MA, United States(3)Woods Hole Oceanographic Institution, Marine Chemistry & Geochemistry, Woods Hole, MA, United States
Student Paper Review Liaison: Bradley B Tolar, Stanford University, Earth System Science, Stanford, CA, United States
Co-Sponsor(s):
Abstracts Submitted to this Session:
Spatial and Temporal Comparison of DNRA Communities in New River Estuary, USA (91675)
Bongkeun Song1, Jessica Lisa1 and Craig R Tobias2, (1)Virginia Institute of Marine Science, Biological Sciences, Gloucester Point, VA, United States, (2)University of Connecticut, Department of Marine Sciences, Groton, CT, United States
The response of San Francisco Bay Delta phytoplankton communities to experimental ammonium, nitrate, and wastewater effluent additions and changes in irradiance (92401)
Aaron L Strong1, Gert van Dijken2, Matthew M Mills2, Ivy Bifu Huang3, Christopher Francis2, Stephen G Monismith4 and Kevin R Arrigo2, (1)Stanford University, Stanford, CA, United States, (2)Stanford University, Earth System Science, Stanford, CA, United States, (3)Stanford University, Dept. of Civil and Environmental Engineering, Stanford, CA, United States, (4)Stanford University, Environmental Fluid Mechanics Laboratory, Stanford, CA, United States
The Effect of Temperature on Key Aspects of the Nitrogen Cycle: Comparisons Across Systems (91472)
Victoria Warren, Queen Mary University of London, School of Biological and Chemical Sciences, London, United Kingdom
Surface ocean dissolved organic nitrogen concentration and isotopic composition in the eastern tropical South Pacific (89250)
Angela N Knapp, Florida State University, Tallahassee, FL, United States, Karen L Casciotti, Stanford University, Earth System Science, Stanford, United States and Maria G Prokopenko, Pomona College, Geology, Claremont, CA, United States
Surviving a High Nutrient-Low Chlorophyll (HNLC) region: insights to the internal cycling of nitrogen and iron in the eastern equatorial Pacific (90721)
Patrick A Rafter, University of California Irvine, Irvine, CA, United States, Katherine R Mackey, University of California Irvine, Earth System Science, Irvine, CA, United States, Ryan R Rykaczewski, University of South Carolina, Columbia, SC, United States and Daniel Mikhail Sigman, Princeton University, Princeton, NJ, United States
Spatial Variations in N
2O Concentration and Isotopomer Composition off the Peru Coast (87482)
Annie Bourbonnais1, Robert T Letscher2, Annette Kock3, Hermann Bange3 and Mark A Altabet1, (1)University of Massachusetts Dartmouth, New Bedford, MA, United States, (2)University of New Hampshire, Earth Sciences, Durham, NH, United States, (3)GEOMAR, Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
