BN33B:
Understanding Controls on Marine Nitrogen Cycling: From Microbes to the Global Ocean I


Session ID#: 37149

Session Description:
Marine nitrogen (N) exerts an important control on marine productivity affecting climate relevant gases such as CO2 and N2O. Understanding the controls of the rates and distribution of N-cycling processes (inventory-altering and internal-cycling N processes, such as atmospheric deposition, N2 fixation, denitrification, nitrification, and N2O production) and their interaction with other biogeochemical cycles (C, P, Fe and O2) is therefore of fundamental importance for predicting the response of marine biogeochemistry to ongoing climate change. Recent advances in N-cycling have come from diverse research fields spanning from novel molecular tools, refined isotopic techniques to global biogeochemical modelling. We invite contributions that use diverse approaches (such as stable and radiogenic isotopes, trace elements, biomarkers, and modelling) to study marine N-cycle processes, covering diverse spatial and temporal scales. This session strives to bring together observationalists, experimentalists, theoreticians, and modellers to promote an integrated understanding of the N-cycling processes that have a critical role in the Earth's climate system.
Primary Chair:  Angela Landolfi, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Co-chairs:  Christopher J Somes, Ji Qixing and Wolfgang Koeve, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Moderators:  Christopher J Somes, Angela Landolfi and Wolfgang Koeve, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Student Paper Review Liaison:  Christopher J Somes, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Index Terms:

1615 Biogeochemical cycles, processes, and modeling [GLOBAL CHANGE]
4802 Anoxic environments [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4840 Microbiology and microbial ecology [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4845 Nutrients and nutrient cycling [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
Cross-Topics:
  • ES - Ecology and Social Interactions
  • MM - Microbiology and Molecular Ecology
  • OM - Ocean Modeling
  • PC - Past, Present and Future Climate

Abstracts Submitted to this Session:

Carbon-based estimate of nitrogen fixation-derived net community production in N-depleted ocean gyres (315085)
Kitack Lee, Pohang University of Science and Technology, Pohang, South Korea, Young Ho Ko, Pohang Univ Sci Tech, Pohang, South Korea, Taro Takahashi, Columbia Univ, Palisades, NY, United States and David M Karl, University of Hawaii at Manoa, Department of Oceanography, Honolulu, United States
NUTRIENTS, NITROGEN-FIXATION, AND PLANKTONIC FOOD WEBS IN TROPICAL RIVER PLUMES (322799)
Joseph Peter Montoya1, Sarah C. Weber1, Natalie Loick-Wilde2, Maren Voss3, Annalisa Bracco4, Rachel Foster5 and Ajit Subramaniam6, (1)Georgia Institute of Technology Main Campus, Atlanta, GA, United States, (2)Leibniz Institute for Baltic Sea Research, Rostock, Germany, (3)Leibniz Institute for Baltic Sea Research Warnemuende (IOW), Biological Oceanography, Rostock, Germany, (4)Georgia Institute of Technology, School of Earth & Atmospheric Sciences, Atlanta, United States, (5)Stockholm University, Department of Ecology, Environment and Plant Sciences, Stockholm, Sweden, (6)Columbia University of New York, LDEO, Palisades, NY, United States
Creatine Uptake in Seawater (319454)
Deborah Ann Bronk1, Boris Wawrik2, Steven Baer1, Chi Liang3, Sun Mei4 and Zhibo Yang4, (1)Bigelow Lab for Ocean Sciences, East Boothbay, ME, United States, (2)University of Oklahoma, Department of Microbiology and Plant Biology, Norman, OK, United States, (3)University of Georgia, Athens, GA, United States, (4)University of Oklahoma Norman Campus, Norman, OK, United States
Ecological control of nitrite in the upper ocean (305011)
Emily Zakem1, Alia Al-Haj2, Matthew J Church3, Gert van Dijken4, Stephanie Dutkiewicz5, Sarah Quinn Foster6, Robinson W Fulweiler7, Matthew M Mills4 and Mick Follows8, (1)MIT, Earth Atmosphere and Planetary Science, Cambridge, United States, (2)Boston University, Earth and Environment, Boston, United States, (3)University of Montana, Flathead Lake Biological Station, MT, United States, (4)Stanford University, Earth System Science, Stanford, United States, (5)Massachusetts Institute of Technology, Department of Earth, Atmospheric and Planetary Sciences, Cambridge, United States, (6)Boston University, Earth and Environment, MA, United States, (7)Boston University, Earth and Environment, Biology, Boston, MA, United States, (8)Massachusetts Institute of Technology, Department of Earth, Atmospheric and Planetary Sciences, Cambridge, MA, United States
A Three-Dimensional Model of the Marine Nitrogen Cycle Constrained by Sedimentary Isotopes in the Modern and Glacial Ocean (303251)
Christopher J Somes1, Andreas Schmittner2, Juan Muglia3 and Andreas Oschlies1, (1)GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, (2)Oregon State University, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, United States, (3)Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), CESIMAR, Puerto Madryn, Argentina
Using Isotopomer Analysis to Determine Drivers of Nitrous Oxide Cycling in the Eastern Tropical North Pacific Ocean (312877)
Colette LaMonica Kelly, Stanford University, Stanford, United States, Bonnie X Chang, Joint Institute for the Study of the Atmosphere and Ocean, University of Washington, Seattle, WA, United States, Carolyn Buchwald, WHOI, Marine Chemistry and Geochemistry, Woods Hole, MA, United States, Matthew Sean Forbes, Stanford University, Earth System Science, Stanford, CA, United States, Andrew R Babbin, Massachusetts Institute of Technology, EAPS, Cambridge, United States and Karen L Casciotti, Stanford University, Oceans Department, Stanford, United States
The effect of sulfide on microbial community structure and the competition between nitrate respiration pathways (324747)
Anna Elizabeth Murphy1, Ashley Bulseco-McKim1, Ross Ackerman2 and Jennifer L Bowen3, (1)Northeastern University, Boston, MA, United States, (2)Bates College, Lewiston, ME, United States, (3)Northeastern University, Department of Marine and Environmental Sciences, Nahant, United States

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