OB24E:
New Tools and Approaches to Constrain the Marine Nitrogen Cycle: From the Surface to the Sediments IV Posters
Session ID#: 93479
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: Christopher J Somes, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany and Angela Landolfi, GEOMAR Helmholtz Centre for Ocean Research Kiel, Marine Biogeochemical Modeling, Kiel, Germany
Student Paper Review Liaison: Christopher J Somes, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Abstracts Submitted to this Session:
Investigating water-column and sediment N2O cycling in the Western Arctic using stable isotopes and isotopomers. (644723)
Annie Bourbonnais, University of South Carolina, School of Earth, Ocean, and Environment, Columbia, United States, Mark A Altabet, Univ Massachusetts Darmouth, New Bedford, United States and Julie Granger, University of Connecticut, Marine Sciences, Groton, United States
New insights into intracellular nitrogen allocation in phytoplankton using δ15N distributions of free amino acids and chlorophyll (655591)
Jenan Kharbush, Harvard University, Earth and Planetary Sciences, Cambridge, United States; University of Michigan Ann Arbor, Earth and Environmental Sciences, Ann Arbor, MI, United States and Ann Pearson, Harvard University, Earth and Planetary Sciences, Cambridge, MA, United States
Salt Marsh Soil Denitrification Rates Stimulated Following Oiling in a Large-scale Marsh Mesocosm Experiment (644873)
Alizia Barnes1, Brian J Roberts2, Charles A Schutte2,3 and Ryann Rossi2, (1)United States, (2)Louisiana Universities Marine Consortium, Chauvin, LA, United States, (3)Rowan University, Environmental Science, Glassboro, NJ, United States
The contribution of coral-associated denitrification and N2 fixation to reef N-cycling (657200)
Tom Glaze, Southern Cross University, Lismore, NSW, Australia and Dirk Erler, Southern Cross University, Centre for Coastal Biogeochemistry, School of Environment, Science and Engineering, Lismore, NSW, Australia
A new method to analyze δ15N of phenylalanine and glutamic acid to reconstruct spatial and temporal variations in N sources and trophic structures (647759)
Lin Zhang, Texas A&M University Corpus Christi, Corpus Christi, TX, United States, Charlotte Wing Man Lee, Texas A&M University-Corpus Christi, Corpus Christi, United States, Chongxiao Ji, Texas A&M University Corpus Christi, Corpus Christi, United States, Rupsa Roy, University of Massachusetts Dartmouth, New Bedford, MA, United States, Ava Kreider-Mueller, University of Massachusetts Dartmouth, School for Marine Science and Technology, New Bedford, MA, United States and Mark A Altabet, Univ Massachusetts Darmouth, New Bedford, United States
Excess Nutrients in a Coral Reef Ecosystem: Dynamics, Sources and Tracer Techniques (638551)
David Whitall, NOAA-NCCOS, Stressor Detection and Impacts Division, Silver Spring, MD, United States, Meagan Curtis, American Samoa Community College, Marine Science, American Samoa and Andrew Mason, NOAA, NCCOS, Silver Spring, United States
Nitrogen Cycling in the Canadian Arctic and Sub-Arctic: Constraints from Dual Nitrate Isotope Data (654290)
Nadine Lehmann1, Carolyn Buchwald1, Samuel H. Davin2, Julie Granger3, Markus Kienast1, Moritz F Lehmann4, Owen Sherwood5 and Jean-Eric Tremblay6, (1)Dalhousie University, Department of Oceanography, Halifax, NS, Canada, (2)Université du Québec à Montréal, GEOTOP - Centre de recherche en géochimie et géodynamique, Montreal, QC, Canada, (3)University of Connecticut, Marine Sciences, Groton, United States, (4)University of Basel, Department of Environmental Sciences, Basel, Switzerland, (5)Dalhousie University, Department of Earth and Environmental Sciences, Halifax, NS, Canada, (6)Laval University, Biology, Quebec City, QC, Canada
Paired Nitrogen Isotope of Chlorophyll-a and Bulk Sediment in Characterizing Coastal Nitrogen Cycling- a Comparative Study in Yellow Sea of China and Benguela Upwelling System (641984)
Yu Xin1, Maojun Yan2, Xiaosong Zhong1 and Shuhang Dong1, (1)Ocean University of China, Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Qingdao, China, (2)Shanghai Jiao Tong University, Qingdao, China
Seasonal dynamics of geochemical gradients along with anammox and denitrification activities in a subterranean estuary located in the York river estuary (656265)
Stephanie J Wilson1, Iris C Anderson2, Craig R Tobias3 and Bongkeun Song1, (1)Virginia Institute of Marine Science, Biological Sciences, Gloucester Point, United States, (2)Virginia Institute of Marine Sciences, Gloucester Point, VA, United States, (3)University of Connecticut, Department of Marine Sciences, Groton, United States
Seasonal transition of the dominant nitrogen source for phytoplankton reconstructed by determining the nitrogen isotope composition for nitrate, ammonium, and individual amino acids of sinking particles in the Northwestern Pacific (640577)
Chisato Yoshikawa1, Nanako O Ogawa2, Yoshito Chikaraishi3, Akiko Makabe4, Yohei Matsui5, Yoshikazu Sasai6, Masahide Wakita7, Makio C Honda8, Yoshihisa Mino9, Maki Noguchi Aita10, Tetsuichi Fujiki11, Takuro Nunoura4, Naomi Harada12 and Naohiko Ohkouchi2, (1)JAMSTEC, Tokosuka, Japan, (2)JAMSTEC Japan Agency for Marine-Earth Science and Technology, Biogeochemistry Research Center (BGC), Research Institute for Marine Resources Utilization (MRU), Kanagawa, Japan, (3)Hokkaido University, Institute of Low Temperature Science, Sapporo, Japan, (4)JAMSTEC, Yokosuka, Japan, (5)JAMSTEC Japan Agency for Marine-Earth Science and Technology, Marine Biodiversity and Environmental Assessment Research Center (BioEnv), Research Institute for Global Change (RIGC), Kanagawa, Japan, (6)Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Research Institute for Global Change (RIGC), Yokohama, Japan, (7)JAMSTEC, MIO, Mutsu, Japan, (8)JAMSTEC, Kanagawa, Japan, (9)Nagoya University, Nagoya, Japan, (10)Japan Agency for Marine-Earth Science and Technology, Research Institute for Global Change, Yokosuka, Japan, (11)JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan, (12)Japan Agency for Marine-Earth Science & Technology, Yokosuka, Japan
