CC017
Ocean deoxygenation in the past, present and future

Session ID#: 254995

Session Description:
Dissolved oxygen in seawater is essential for most marine life. Oxygen levels and regional distributions are sensitive to environmental change, and can, via redox-dependent switches in major biogeochemical cycles, feedback on climate.

The open ocean, and coastal areas heavily influenced by runoff from land, have been losing oxygen for the past half century, with localised decreases of 50%, driven by warming and enhanced nutrient inputs. While deoxygenation can lead to shifting and shrinking of marine habitats, declines in biodiversity, and alterations in biogeochemical cycles, a full quantitative understanding of the observed oxygen loss is lacking. Model simulations project that dissolved oxygen levels in the global ocean will continue to decline into the future, primarily proportional to CO2 emission scenarios. Coastal eutrophication is expected to continue and worsen due to warming-induced stratification.

Several deoxygenation events have been identified for the ocean’s geological past, some of these linked to extinction events. Better constraining causes, mechanisms and sequences of large-amplitude events may help to better understand the threat of current and likely future ocean deoxygenation.

Contributions are invited investigating present, past and future levels of dissolved oxygen levels, drivers of change, mechanisms of change, feedbacks, and  impacts on ecosystems and the Earth system.

Co-Sponsor(s):
  • Climate and Ocean Change -
  • Coastal and Estuarine Biology and Biogeochemistry -
  • Ocean Biology and Biogeochemistry -
Index Terms:

1615 Biogeochemical cycles, processes, and modeling [GLOBAL CHANGE]
1626 Global climate models [GLOBAL CHANGE]
1635 Oceans [GLOBAL CHANGE]
Student/Early Career Chair:  Xiaoyi Guo, Ocean University of China, Key Laboratory of Marine Chemistry Theory and Technology, Qingdao, China
Primary Chair:  Babette Hoogakker, Heriot-Watt University, The Lyell Centre, Edinburgh, United Kingdom
Co-Chair:  Andreas Oschlies, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
 
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Xiaoyi Guo, Ocean University of China, Key Laboratory of Marine Chemistry Theory and Technology, Qingdao, China
 
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Laetitia Pichevin, University of Edinburgh, School of Geosciences, Edinburgh, United Kingdom, Raja Ganeshram, University of Edinburgh, Edinburgh, United Kingdom, Elsa Arellano Torres, Univ. Nac. Autonoma de Mexico, Mexico Df, Mexico and Dharma Reyes Macaya, Heriot-Watt University, Paleobiogeochemistry working group, Edinburgh, United Kingdom
 
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Claudia R Benitez-Nelson, University of South Carolina, School of the Earth, Ocean, and Environment, Columbia, SC, United States and Willard S Moore, University of South Carolina, School of the Earth, Ocean and Environment, Columbia, United States
 
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Felix Margirier1, Chloé Lefevre2, Elena Vlasceanu3, Razvan Mateescu3, Dragos Niculescu3, Dragos Marin4 and Laurent Beguery1, (1)ALSEAMAR, Rousset, France, (2)University of the South Toulon-Var, La Garde, France, (3)National Institute for Marine Research and Development (NIMRD) “Grigore Antipa”, Constanta, Romania, (4)National Institute for Marine Research and Development (NIMRD) “Grigore Antipa”, Oceanography, Coastal and Marine Engineering, Constanța, Romania
 
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Sebastián Garrido, Heriot-Watt University, Edinburgh, United Kingdom, Babette Hoogakker, Heriot-Watt University, The Lyell Centre, Edinburgh, United Kingdom, Iván Hernández-Almeida, ETH Zurich, Zurich, Switzerland, Magali Schweizer, University of Angers, Laboratoire de Planétologie et Géosciences, Angers Cedex, France, Dharma Reyes Macaya, Heriot-Watt University, Paleobiogeochemistry working group, Edinburgh, United Kingdom; MARUM - University of Bremen, Bremen, Germany, María Yolanda Núñez, Pontifical Catholic University of Chile, Escuela de Diseño, Santiago, Chile, Jorge Cardich, Universidad Peruana Cayetano Heredia, Facultad de Ciencias y Filosofia-CIDIS, Lima, Peru, Melanie J Leng, British Geological Survey, NERC Isotope Geoscience Facilities, Nottingham, United Kingdom, Kotryna Savickaite, British Geological Survey Keyworth, NERC Isotope Geoscience Facilities, Nottinghamshire, United Kingdom, Dierk Hebbeln, University of Bremen, MARUM﹣Center for Marine Environmental Sciences, Bremen, Germany and Eugenia M. Gayo, University of Chile, Departamento de Geografía, Santiago, Chile
 
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Alexandra Auderset1, Dr. Anya Hess2, Florent Fayolle1, Anja S Studer3, Anya J. Crocker4, Paul A. Wilson4, Yair Rosenthal5, Daniel Mikhail Sigman6 and Alfredo Martinez-Garcia7, (1)University of Southampton, Southampton, SO14, United Kingdom, (2)George Mason University, Fairfax, United States, (3)University of Basel, Basel, Switzerland, (4)University of Southampton, Southampton, United Kingdom, (5)Rutgers University, New Brunswick, United States, (6)Princeton University, Geosciences, Princeton, United States, (7)Max Planck Institute for Chemistry, Climate Geochemistry, Mainz, Germany
 
Unraveling hypoxia events in a context of climate change in the Bay of Vilaine, France (2041323)
Coline Poppeschi, Ifremer, Laboratoire d’Océanographie Physique et Spatiale (LOPS), Plouzané, France, Anne Daniel, IFREMER, Plouzané, France and Dr. Guillaume Charria, IFREMER, Univ. Brest, CNRS, IRD, LOPS, Brest, France
 
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Jeremy M Testa, University of Maryland Center for Environmental Science, Chesapeake Biological Laboratory, Solomons, United States and Chunqi Shen, Suzhou University of Science and Technology, College of Environmental Science and Engineering, Suzhou City, China
 
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Catherine Davis, Organization Not Listed, Washington, DC, United States, Alexandra Auderset, University of Southampton, School of Ocean and Earth Science, Southampton, United Kingdom, Rachel Alcorn, North Carolina State University, Raleigh, United States, Yi Wang, Tulane University, New Orleans, United States, Christopher J Somes, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, Babette Hoogakker, Heriot-Watt University, The Lyell Centre, Edinburgh, United Kingdom and PO2 GIG Team
 
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Sara Kahanamoku, University of Hawaii at Manoa, Honolulu, HI, United States, Seth Finnegan, University of California Berkeley, Integrative Biology, Berkeley, United States and Ivo A.P. Duijnstee, UC Berkeley, Department of Integrative Biology and Museum of Paleontology, Berkeley, United States
 
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Yi Liu, Justin Leonard Penn and Curtis Deutsch, Princeton University, Department of Geosciences, Princeton, United States
 
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