OB13C:
New Tools and Approaches to Constrain the Marine Nitrogen Cycle: From the Surface to the Sediments I

Session ID#: 93161

Session Description:
Nitrogen (N) exerts an important control on marine productivity affecting ocean deoxygenation and climate relevant gases such as CO2 and N2O. Natural and anthropogenic changes can significantly alter the marine N cycle. Understanding what controls the rates and distribution of key N-cycle processes (including but not limited to atmospheric deposition, riverine discharge, N2 fixation, N-loss, nitrification, organic production and recycling) and their interaction with other biogeochemical cycles (e.g. C, P, Fe, O2) is therefore of fundamental importance for predicting the response and resilience of marine biogeochemistry to ongoing climate change and pollution. We invite contributions that use various techniques (such as isotopes, molecular, biomarkers, modelling) to study N-cycle processes, covering diverse spatial and temporal scales. This session strives to bring together observationalists, experimentalists, and modellers to promote an integrated understanding of the N-cycle and its sensitivity to environmental change.
Co-Sponsor(s):
  • IS - Ocean Observatories, Instrumentation and Sensing Technologies
  • MM - Microbiology and Molecular Ecology
  • PI - Physical-Biological Interactions
Index Terms:
Primary Chair:  Christopher J Somes, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Co-chairs:  Mar Benavides, Mediterranean Institute of Oceanography, Marseille Cedex 09, France, Angela Landolfi, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany and Carolin R. Löscher, Univ Southern Denmark, Odense, Denmark
Primary Liaison:  Christopher J Somes, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Moderators:  Christopher J Somes, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany and Mar Benavides, Mediterranean Institute of Oceanography, Marseille Cedex 09, France
Student Paper Review Liaison:  Mar Benavides, Mediterranean Institute of Oceanography, Marseille Cedex 09, France

Abstracts Submitted to this Session:

Introducing the Argon-Hydrogen Method to Measure Biological Nitrogen Fixation (642248)
Samuel T Wilson1, Mathieu Caffin2, Angelicque E White3 and David M Karl3, (1)Daniel K. Inouye Center for Microbial Oceanography: Research and Education, University of Hawaii at Manoa, Honolulu, HI, United States, (2)University of Hawaii at Manoa, Department of Oceanography, Honolulu, United States, (3)University of Hawaii, Department of Oceanography, Honolulu, HI, United States
Phosphate availability as a key factor controlling nitrogen fixation and the BCP in the iron rich Western Tropical South Pacific (643278)
Thierry Moutin, Mediterranean Institute of Oceanography, Aix Marseille University, Marseille, France
Molecular diagnosis of Trichodesmiumnutrient limitation in the oligotrophic North Atlantic (643750)
Elena Cerdan1, Despo Polyviou2, Alison J Baylay2, Claire Mahaffey3, Maeve C Lohan2, Malcolm Woodward4, Mark M Moore5, Julie Robidart6 and Thomas S Bibby2, (1)University of Southampton, Southampton, United Kingdom, (2)University of Southampton, Ocean and Earth Sciences, National Oceanography Centre, Southampton, United Kingdom, (3)University of Liverpool, Earth, Ocean and Ecological Sciences, Liverpool, United Kingdom, (4)Plymouth Marine Laboratory, Plymouth, United Kingdom, (5)University of Southampton, Ocean and Earth Science, Southampton, United Kingdom, (6)National Oceanography Centre Southampton, Ocean Technology and Engineering, Southampton, United Kingdom
Effects of water mass mixing on diazotrophy at the New England shelfbreak front (644423)
Corday Selden1, Margaret R Mulholland2, Phoebe D Chappell3, Sophie Clayton3, Alfonso Macias-Tapia4, Peter W Bernhardt5 and Dennis Joseph McGillicuddy Jr6, (1)Old Dominion University, Ocean, Earth and Atmospheric Sciences, Norfolk, United States, (2)Old Dominion University, Ocean and Earth Sciences, Norfolk, United States, (3)Old Dominion University, Ocean, Earth, and Atmospheric Sciences, Norfolk, VA, United States, (4)Old Dominion University, Norfolk, VA, United States, (5)Old Dominion University, Department of Ocean and Earth Sciences, Norfolk, United States, (6)Woods Hole Oeanographic Institution, Woods Hole, MA, United States
Nitrogen fixation by the UCYN-A/haptophyte symbiosis in coastal waters of the southern California Current System (648952)
Kendra A Turk-Kubo1, Matthew M Mills2, Kevin R Arrigo2, Gert van Dijken2, Britt Anderson Henke1, Brittany Stewart3, Samuel Wilson4 and Jonathan P Zehr5, (1)University of California Santa Cruz, Ocean Sciences, Santa Cruz, CA, United States, (2)Stanford University, Earth System Science, Stanford, CA, United States, (3)University of Southern California, Los Angeles, United States, (4)University of California, San Diego, United States, (5)University of California, Ocean Sciences, Santa Cruz, CA, United States
Data-Driven Modeling of the Distribution of Diazotrophs in the Global Ocean (654590)
Weiyi Tang1,2 and Nicolas Cassar2,3, (1)Princeton University, Department of Geosciences, Princeton, NJ, United States, (2)Duke University, Nicholas School of the Environment, Durham, NC, United States, (3)Institut Universitaire Européen de la Mer (IUEM), Laboratoire des Sciences de l'Environnement Marin (LEMAR), Brest, France
Predicting how O2 characterizes the niche of marine unicellular diazotroph Crocosphaera (647954)
Keisuke Inomura1, Curtis A. Deutsch2, Samuel T Wilson3, Takako Masuda4, Evelyn Lawrenz4, Bučinská Lenka5, Roman Sobotka5, Julia Gauglitz6, Mak A Saito7, Ondřej Prášil4, Naoto Takahata8, Takuhei Shiozaki9, Yuji Sano10, Ken Furuya and Michael J Follows12, (1)University of Washington Seattle, Seattle, WA, United States, (2)University of Washington Seattle Campus, School of Oceanography, Seattle, United States, (3)Daniel K. Inouye Center for Microbial Oceanography: Research and Education, University of Hawaii at Manoa, Honolulu, HI, United States, (4)Institute of Microbiology, Czech Academy of Sciences, Center Algatech, Třeboň, Czech Republic, (5)Institute of Microbiology, Czech Academy of Sciences, Czech Republic, (6)Woods Hole Oceanographic Institution, Marine Chemistry and Geochemistry, Woods Hole, MA, United States, (7)WHOI, Woods Hole, MA, United States, (8)University of Tokyo, Atmosphere and Ocean Research Institute, Kashiwa, Japan, (9)The University of Tokyo, Tokyo, Japan, (10)Center for Advanced Marie Core Research, Kochi University, Nankoku, Japan, (11)Massachusetts Institute of Technology, Cambridge, MA, United States
Identifying active diazotrophs in deep-sea sediment (655087)
Anne E Dekas1, Bennett James Kapili2, Samuel E Barnett3 and Daniel H. Buckley3, (1)Stanford University, Earth System Science, Stanford, United States, (2)Stanford University, Department of Earth System Science, Stanford, CA, United States, (3)Cornell University, School of Integrative Plant Science, Ithaca, NY, United States