OB14D:
New Tools and Approaches to Constrain the Marine Nitrogen Cycle: From the Surface to the Sediments III Posters
Session ID#: 85860
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):
Primary Chair: Christopher J Somes, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Co-chairs: Mar Benavides, Aix Marseille University, Mediterranean Institute of Oceanography, Marseille, France, Angela Landolfi, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany and Carolin R. Löscher, University of Southern Denmark, Biology, Odense, Denmark
Primary Liaison: Christopher J Somes, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Moderators: Mar Benavides, Aix Marseille University, Mediterranean Institute of Oceanography, Marseille, France and Carolin R. Löscher, University of Southern Denmark, Biology, Odense, Denmark
Student Paper Review Liaison: Mar Benavides, Aix Marseille University, Mediterranean Institute of Oceanography, Marseille, France
Abstracts Submitted to this Session:
Cell-specific Nitrogen Fixation Rates of the Symbiotic Cyanobacterium UCYN-A Vary with Depth and Photoperiod (654448)
Mary Rose Gradoville1, Ana Maria Cabello Perez1, Samuel T Wilson2, Kendra A Turk-Kubo1, David M Karl2 and Jonathan P Zehr1, (1)University of California Santa Cruz, Ocean Sciences, Santa Cruz, CA, United States, (2)University of Hawaii at Manoa, Department of Oceanography, Honolulu, HI, United States
Dominance of heterotrophic N2 fixation in a temperate estuary (643384)
Mar Benavides1, Søren Hallstrøm2, Clayton Woodward Evans3, Lindsey Janel Potts4, Julie Granger5, Craig R Tobias4, Colleen B Mouw6, Lasse Riemann7 and Pia Moisander8, (1)Aix Marseille University, Mediterranean Institute of Oceanography, Marseille, France, (2)Copenhaguen University, Denmark, (3)Texas State University San Marcos, San Marcos, TX, United States, (4)University of Connecticut, Department of Marine Sciences, Groton, CT, United States, (5)University of Connecticut, Marine Sciences, Groton, United States, (6)University of Rhode Island, Narragansett, RI, United States, (7)University of Copenhagen, Marine Biological Section, Helsingor, DE, Denmark, (8)University of Massachusetts Dartmouth, Department of Biology, North Dartmouth, MA, United States
Effects of Mesoscale Eddies on the Contribution of N2 Fixation to Export Production in the North Pacific Subtropical Gyre (652025)
Mengyang Zhou1, Julie Granger2, Angelicque E White3, Benedetto Barone4 and David M Karl3, (1)University of Connecticut, Groton, CT, United States, (2)University of Connecticut, Marine Sciences, Groton, United States, (3)University of Hawaii at Manoa, Department of Oceanography, Honolulu, HI, United States, (4)University of Hawaii at Manoa, Honolulu, HI, United States
Hydrogen production by diazotrophs: a novel approach for high frequency measurements of nitrogen fixation (644197)
Mathieu Caffin1, Samuel T Wilson2, Angelicque E White3 and David M Karl2, (1)University of Hawaii at Manoa, Department of Oceanography, Honolulu, United States, (2)Daniel K. Inouye Center for Microbial Oceanography: Research and Education, University of Hawaii at Manoa, Honolulu, HI, United States, (3)University of Hawaii, Department of Oceanography, Honolulu, HI, United States
Unexpected Presence of the Nitrogen-fixing Symbiotic Cyanobacterium UCYN-A in Coastal Monterey Bay Waters (655148)
Ana Maria Cabello Perez1, Kendra A Turk-Kubo1, Kendra Negrey1, Lucien Jacobs1, Raphael Martin Kudela2 and Jonathan P Zehr1, (1)University of California Santa Cruz, Ocean Sciences, Santa Cruz, CA, United States, (2)University of California Santa Cruz, Santa Cruz, United States
Airborne microbes contribute to N2 fixation in surface water of the Northern Red Sea (490630)
Eyal Rahav1, Adina Paytan2, Esra Mescioglu3, Yuri Galletti4, Sahar Rosenfeld5, Ofrat Raveh5, Chiara Santinelli6, Tung-Yuan Hou7 and Barak Herut5, (1)Israel Oceanographic and Limnological Research, National Institute of Oceanography, Haifa, Israel, (2)University of California Santa Cruz, Institute of Marine Sciences, Santa Cruz, United States, (3)University of California Santa Cruz, Santa Cruz, CA, United States, (4)Institute of Biophysics, C.N.R, Area della Ricerca di Pisa, Italy, (5)Israel Oceanographic and Limnological Research, Haifa, Israel, (6)CNR Institute of Biophysics, Pisa, Italy, (7)IONTU Institute of Oceanography National Taiwan University, Taipei, Taiwan
Detection of the Nitrogen Fixing Bacteria UCYN-A using nifH geneFISH (656809)
Katie Jean Harding1,2, Kendra A Turk-Kubo1, Xavier Mayali2 and Jonathan P Zehr1, (1)University of California Santa Cruz, Ocean Sciences, Santa Cruz, CA, United States, (2)Lawrence Livermore National Laboratory, Livermore, CA, United States
Modelling the Impact of Multiple Environmental Drivers on Marine Diazotrophy (641324)
Lewis Wrightson1, Claire Mahaffey2, Olivier Aumont3 and Alessandro Tagliabue2, (1)University of Liverpool, Liverpool, L69, United Kingdom, (2)University of Liverpool, Earth, Ocean and Ecological Sciences, Liverpool, United Kingdom, (3)IPSL, Laboratoire d’Oceanographie et de Climatologie: Experimentation et Approches Numeriques, Paris, France
Three Years of Observations Show a Sharp Boundary for Diazotrophs and N2 Fixation Rates near the Northern Subtropical Front of the North Pacific Ocean (654216)
Wingkwan Mak1, Mary Rose Gradoville1, Hanna Farnelid2, Angelicque E White3, Kendra A Turk-Kubo1, Brittany Stewart4, Francois Ribalet5, Sara Ferrón6, Paulina Pinedo-Gonzalez7, Virginia Armbrust5, David M Karl3, Seth John8 and Jonathan P Zehr1, (1)University of California Santa Cruz, Ocean Sciences, Santa Cruz, CA, United States, (2)Linnaeus University, Department of Biology and Environmental Science, Kalmar, Sweden, (3)University of Hawaii at Manoa, Department of Oceanography, Honolulu, HI, United States, (4)University of Southern California, Los Angeles, United States, (5)University of Washington, School of Oceanography, Seattle, WA, United States, (6)University of Hawaii, Department of Oceanography, Honolulu, HI, United States, (7)Lamont -Doherty Earth Observatory, Geochemistry, Palisades, NY, United States, (8)University of Southern California, Earth Sciences, Los Angeles, United States
