HE006
Mechanisms for Variability, Circulation, and Transformation of Water Masses in the Southern Ocean
Session ID#: 85874
Session Description:
The Southern Ocean plays an important role in global climate; encircling the globe, linking the different ocean basins, and connecting the surface ocean with the abyss. The southern limb of the global meridional overturning circulation regulates the storage of heat and carbon in the deep ocean through transformation of deep water into bottom and intermediate water. The upwelling of nutrient-rich deep water further regulates primary productivity and the biological pumping of carbon into the deep ocean, thus affecting global biogeochemical cycling. The Antarctic Circumpolar Current and the meridional overturning circulation have historically been described in zonal-mean frameworks that neglect the potential contributions from local and regional processes. Recent studies show that localized processes including those due to the influence of topography and frontal dynamics shape the large-scale dynamics, upwelling, tracer distributions, and biogeochemistry in the Southern Ocean. This session aims to facilitate a discussion on the physical mechanisms that control the variability, circulation, and transformation of water masses in the Southern Ocean. Our focus will be on the importance of local dynamics in the Antarctic Circumpolar Current, the fluxes and upwelling of deep water across the Southern Ocean and onto the Antarctic shelf, and the mechanisms responsible for the export of bottom and intermediate water into the global ocean. To complement this, we encourage discussion on diabatic processes responsible for the transformation of these water masses by air-ice-sea interactions and mixing, as well as discussion linking the dynamics and water-mass transformation to the biogeochemical properties of the Southern Ocean.
Index Terms:
4215 Climate and interannual variability [OCEANOGRAPHY: GENERAL]
4219 Continental shelf and slope processes [OCEANOGRAPHY: GENERAL]
4273 Physical and biogeochemical interactions [OCEANOGRAPHY: GENERAL]
4273 Physical and biogeochemical interactions [OCEANOGRAPHY: GENERAL]
4283 Water masses [OCEANOGRAPHY: GENERAL]
4520 Eddies and mesoscale processes [OCEANOGRAPHY: PHYSICAL]
4562 Topographic/bathymetric interactions [OCEANOGRAPHY: PHYSICAL]
4806 Carbon cycling [OCEANOGRAPHY: BIOLOGICAL]
Primary Chair: Annie Foppert, Centre for Southern Hemisphere Oceans Research, CSIRO Oceans and Atmosphere, Hobart, Australia, Hobart, TAS, Australia
Co-chairs: Edward Doddridge, University of Oxford, Oxford, United Kingdom, Dafydd Gwyn Evans, University of Southampton, Southampton, SO14, United Kingdom and Madeleine K Youngs, Massachusetts Institute of Technology, Cambridge, MA, United States
Primary Liaison: Annie Foppert, University of Rhode Island, Narragansett, RI, United States
Drivers of Interannual Variability in Southeast Pacific Subantarctic Mode Water (Invited) (635448)
Rachael Sanders1,2, Andrew Meijers1, Paul Holland3 and Alberto Naveira Garabato4, (1)NERC British Antarctic Survey, Cambridge, United Kingdom, (2)University of Southampton, Southampton, United Kingdom, (3)British Antarctic Survey, Cambridge, United Kingdom, (4)University of Southampton, National Oceanography Centre, Southampton, United Kingdom
Effect of horizontal resolution on the Southern Ocean circulation in the new GFDL OM4 model (639280)
Carolina O. Dufour, McGill University, Department of Atmospheric and Oceanic Sciences, Montreal, QC, Canada, Alistair Adcroft, Princeton University, Atmospheric and Oceanic Sciences, Princeton, NJ, United States and Stephen Matthew Griffies, NOAA Geop Fluid Dynamics Lab, Princeton, NJ, United States
Along-slope variability of cross-slope eddy transport in East Antarctica (640064)
Annie Foppert, Centre for Southern Hemisphere Oceans Research, CSIRO Oceans and Atmosphere, Hobart, Australia, Hobart, TAS, Australia, Stephen R Rintoul, Antarctic Climate and Ecosystems Cooperative Research Centre (ACE CRC), Hobart, Australia and Matthew H England, Univ New South Wales, Sydney, Australia
What drives the Antarctic Slope Current? (641119)
Andrew Stewart, University of California Los Angeles, Atmospheric and Oceanic Sciences, Los Angeles, United States, Andreas Klocker, University of Tasmania, Institute for Marine and Antarctic Studies, Tasmania, TAS, Australia and Dimitris Menemenlis, NASA Jet Propulsion Laboratory, Pasadena, CA, United States
Water-Mass Transformation in the Weddell Gyre (641534)
Shanice Bailey, Lamont Doherty Earth Observatory, New York, NY, United States; Columbia University of New York, Earth & Environmental Sciences, Palisades, NY, United States
Ventilation and carbon uptake in the southern oceans: Response to wind stress changes (642119)
Darryn Waugh, Johns Hopkins University, Baltimore, MD, United States, Thomas W N Haine, Johns Hopkins Univ, Baltimore, MD, United States, Matthew H England, Univ New South Wales, Sydney, Australia, Paul Spence, University of New South Wales, Climate Change Research Centre, Sydney, NSW, Australia and Andrew M. Hogg, Australian National University, Canberra, ACT, Australia
Time of Emergence of Human-Induced Climate Signal in the World Ocean Water-Masses (643054)
Yona Silvy1, Eric Guilyardi1, Jean-baptiste Sallee2 and Paul James Durack3, (1)Sorbonne Université, LOCEAN-IPSL, CNRS/IRD/MNHN, Paris, France, (2)Sorbonne Université, LOCEAN‐IPSL, CNRS/IRD/MNHN, Paris, France, (3)Lawrence Livermore Nat. Lab., Program for Climate Model Diagnosis and Intercomparison, Livermore, CA, United States
Topographic control of mixing in a dense boundary current in the Orkney Passage (643257)
Sonya Legg1, Einar Povl Abrahamsen2, Christian E. Buckingham2, Alex Forryan3, Eleanor Frajka-Williams4, Stephen Griffies5, Alberto Naveira Garabato6, Keith W Nicholls2, Kurt L Polzin7, Jean-baptiste Sallee8, Carl Spingys3 and Lily Wittle9, (1)Princeton University, Princeton, NJ, United States, (2)British Antarctic Survey, Cambridge, United Kingdom, (3)University of Southampton, Southampton, United Kingdom, (4)National Oceanography Centre, Southampton, United Kingdom, (5)Geophysical Fluid Dynamics Laboratory, United States, (6)University of Southampton, National Oceanography Centre, Southampton, United Kingdom, (7)WHOI, Woods Hole, MA, United States, (8)Sorbonne Université, LOCEAN‐IPSL, CNRS/IRD/MNHN, Paris, France, (9)NOAA Ernest F Hollings Undergraduate Scholarship Program, Silver Spring, MD, United States
A see-saw in Pacific Subantarctic Mode Water formation driven by atmospheric modes (643342)
Andrew Meijers1, Ivana Cerovecki2, Brian A. King3 and Veronica Tamsitt2, (1)NERC British Antarctic Survey, Cambridge, United Kingdom, (2)Scripps Institute of Oceanography, La Jolla, CA, United States, (3)National Oceanography Centre, Southampton, United Kingdom
Description and Dynamics of the Santos Bifurcation (643681)
Ágata Piffer Braga, University of Massachusetts Dartmouth, MA, United States, Ilson C Da Silveira, Instituto Oceanografico - University of São Paulo, Sao Paulo, Brazil and Avijit Gangopadhyay, University of Massachusetts Dartmouth, School for Marine Science and Technology, New Bedford, MA, United States
Mesoscale Eddy Transport Across the Polar Front: a Model-Observation Comparison (644081)
Audrey-Anne Gauthier, McGill University, Montreal, QC, Canada, Carolina O. Dufour, Princeton University, Program in Atmospheric and Oceanic Sciences, Princeton, NJ, United States, Alison R Gray, University of Washington, School of Oceanography, Seattle, WA, United States and Stephen Griffies, Geophysical Fluid Dynamics Laboratory, United States
Origin, pathways, and characteristics of deep-ocean mesoscale eddies influencing the shelf seas of a sub-Antarctic Archipelago in the Southern Ocean: The Prince Edward Islands (644917)
Tarron Lamont, Department of Environmental Affairs, Oceans & Coasts Research Branch, Cape Town 8012, South Africa and Marcel Van den Berg, Department of Environmental Affairs, Oceans & Coasts Research Branch, Cape Town, South Africa
Characterising the influence of deep-ocean eddies and fronts on the shelf seas of a sub-Antarctic Archipelago in the Southern Ocean: The Prince Edward Islands (644968)
Marcel Van den Berg, Department of Environmental Affairs, Oceans & Coasts Research Branch, Cape Town, South Africa, Tarron Lamont, Department of Environmental Affairs, Oceans & Coasts Research Branch, Cape Town 8012, South Africa and Isabelle Jane Ansorge, university of Cape Town, Department of Oceanography, Cape Town, South Africa
Does Topographic Form Stress Impede the Antarctic Slope Current? (644987)
Yue BAI, University of California, Los Angeles, Los Angeles, CA, United States, Yan Wang, Harvard University, School of Public Health, Cambridge, MA, United States and Andrew Stewart, University of California Los Angeles, Atmospheric and Oceanic Sciences, Los Angeles, United States
Genesis of the Antarctic Slope Current in West Antarctica (645065)
Andrew F Thompson, California Institute of Technology, Physical Oceanography, Pasadena, CA, United States, Xiaozhou Ruan, Massachusetts Institute of Technology, Cambridge, United States, Kevin Speer, Geophysical Fluid Dynamics Institute, Tallahassee, FL, United States, Lena M. Schulze Chretien, Jacksonville University, Marine Science Research Institute, Jacksonville, FL, United States, Karen J. Heywood, University of East Anglia, Norwich, NR4, United Kingdom and Ria Oelerich, University of East Anglia, Norwich, United Kingdom
A decadal reduction of Subantarctic Mode Water formation in the Southern Indian Ocean during 2004-2018 (645146)
Yu Hong, SCSIO South China Sea Institute of Oceanology, Chinese Academy of Sciences, State Key Laboratory of Tropical Oceanography, Guangzhou, China and Yan DU, South China Sea Institute of Oceanology, Chinese Academy of Sciences, State Key Laboratory of Tropical Oceanography, Guangzhou, China
Variability and controls of the interior density structure of the Southern Ocean (645657)
Raquel Somavilla, Spanish Institute of Oceanography, Physical Oceanography, Santander, Spain, Alberto Naveira Garabato, University of Southampton, Southampton, SO14, United Kingdom, Cesar González-Pola, Spanish Institute of Oceanography, Physical Oceanography, Gijon, Spain and Julio Manuel Fernandez, University of Oviedo, Applied Physics, Oviedo, Spain
Ice loss induced by wind-induced anomalous heat storage in the Antarctic seasonal ice zone (646414)
Edward Doddridge, Massachusetts Institute of Technology, Earth, Atmospheric and Planetary Sciences, Cambridge, MA, United States, John C Marshall, MIT, Cambridge, MA, United States, Jean-Michel Campin, M.I.T./EAPS, Cambridge, MA, United States and Maxwell Kelley, NASA Goddard Institute for Space Studies, New York, NY, United States
Impacts of ice-shelf melting on water mass transformation in the Southern Ocean from E3SM simulations (646803)
Hyein Jeong1, Xylar Asay-Davis2, Adrian K Turner1, Darin Scott Comeau1, Stephen F Price1, Ryan Abernathey3, Carmela Veneziani1, Mark R Petersen1, Matthew J Hoffman1, Matthew R Mazloff4 and Todd Ringler1, (1)Los Alamos National Laboratory, Los Alamos, NM, United States, (2)Los Alamos National Laboratory, Los Alamos, United States, (3)Lamont -Doherty Earth Observatory, Palisades, NY, United States, (4)SIO, La Jolla, CA, United States
A Major Shift in Southern Ocean Climate System (646846)
Alexander Haumann, Princeton University, Atmospheric and Oceanic Sciences Program, Princeton, United States, Samuel Bartusek, Princeton University, Department of Geosciences, Princeton, NJ, United States, Tom Bracegirdle, British Antarctic Survey, Cambridge, United Kingdom, Michael Paul Meredith, NERC British Antarctic Survey, Cambridge, United Kingdom and Jorge L Sarmiento, Princeton University, Atmospheric and Oceanic Sciences Program, Princeton, NJ, United States
Southern Ocean standing meander and sea level anomalies: over 20 years of trends (649116)
Amelie Meyer, University of Tasmania, Australian Research Council Centre of Excellence for Climate Extremes, Hobart, TAS, Australia, Clothilde Langlais, CSIRO Marine and Atmospheric Research Hobart, Hobart, TAS, Australia, Navid Constantinou, Australian National University, Research School of Earth Sciences, Canberra, ACT, Australia, Benoit Legresy, CSIRO Oceans and Atmosphere, TAS, Australia, Andrew M. Hogg, Australian National University, Canberra, ACT, Australia and N L Bindoff, Univ Tasmania, Hobart, Australia
Eastward-propagating interannual variability in Southern Ocean deep mixed layers (650413)
Yiqun Lu1,2, Lynne D Talley3, Ivana Cerovecki4, Shang-Ping Xie2, Matthew R Mazloff5, Sarah T Gille6, Qinyu Liu1 and Yu Zhang1, (1)Ocean University of China, Qingdao, China, (2)Scripps Institution of Oceanography, La Jolla, CA, United States, (3)University of California San Diego, La Jolla, CA, United States, (4)Scripps Institute of Oceanography, La Jolla, CA, United States, (5)SIO, La Jolla, CA, United States, (6)UCSD, La Jolla, CA, United States
Long term observed changes of the global and Southern Ocean surface layer (650850)
Jean-baptiste Sallee, University Pierre and Marie Curie Paris VI, Paris, France, Pellichero Violaine, University of Tasmania, IMAS, Melbourne, VIC, Australia; University Pierre et Marie Curie, Paris VI, Paris, France, Etienne Pauthenet, Sorbonne Université, LOCEAN‐IPSL, CNRS/IRD/MNHN, Paris, France, Camille Akhoudas, Sorbonne Université - CNRS/IRD/MNHN, LOCEAN, Paris, France and Lucie Vignes, Sorbonne Universite - LOCEAN, Paris, France
Using Lagrangian Transit Time Distributions to investigate eddy effects on Carbon uptake in the Southern Ocean (650958)
Manita Chouksey, University of Hamburg, Institute of Oceanography, Theoretical Oceanography, Hamburg, Germany, Alexa Griesel, University of Hamburg, Institute of Oceanography, Germany, Carsten Eden, University of Hamburg, Institute of Oceanography, Hamburg, Germany and Reiner Steinfeldt, University of Bremen, Bremen, Germany
A Continental Shelf Pump for CO2 on the Adélie Land Coast, East Antarctica (653660)
Mar Arroyo, Virginia Institute of Marine Science, Gloucester Point, VA, United States, Elizabeth Shadwick, CSIRO Marine and Atmospheric Research, TAS, Australia, Bronte D Tilbrook, CSIRO Marine and Atmospheric Research, Hobart, TAS, Australia and Kazuya Kusahara, JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan
Internal Waves, Turbulence and Mixing in the Antarctic Circumpolar Current (654396)
Andreas M Thurnherr, Lamont-Doherty Earth Observatory, Palisades, NY, United States, Yvonne Firing, National Oceanography Center, Soton, Southampton, United Kingdom, Teresa K Chereskin, SIO/UCSD, La Jolla, CA, United States and Stephanie Waterman, University of British Columbia, Department of Earth, Ocean and Atmospheric Sciences, Vancouver, BC, Canada
Positive phase of SAM influences winter APO anomalies over the Southern Ocean (654879)
Cynthia D Nevison, INSTAAR/University of Colorado, Boulder, CO, United States, David R Munro, University of Colorado, Department of Atmospheric and Oceanic Sciences and Institute for Arctic and Alpine Research, Boulder, CO, United States, Nicole S Lovenduski, University of Colorado, Department of Atmospheric and Oceanic Sciences, Boulder, CO, United States, Ralph F Keeling, Univ California San Diego, La Jolla, CA, United States, Manfredi Manizza, Univ of California--SIO, Geosciences Research Division, La Jolla, CA, United States, Eric James Morgan, Scripps Institution of Oceanography, La Jolla, CA, United States and Christian Rödenbeck, Max Planck Institute for Biogeochemistry, Jena, Germany
Linking the Antarctic Circumpolar Current with Weddell Sea convection and with the meridional overturning circulation in a hierarchy of GFDL models (655151)
Sergey Molodtsov1, Irina Marinov2, Behzad Asadieh3, John Edward San Soucie2, Anna Cabre4 and Ron Maor5, (1)Texas A & M University College Station, Department of Oceanography, College Station, TX, United States, (2)University of Pennsylvania, Department of Earth and Environmental Sciences, Philadelphia, PA, United States, (3)University of Pennsylvania, Philadelphia, PA, United States, (4)Institute of Marine Science, Department of Physical and Technological Oceanography, Barcelona, Spain, (5)University of Pennsylvania, Earth and Environmental Sciences, Philadelphia, PA, United States
The Response of the Southern Ocean to Sudden and Persistent Extreme SAM Forcing (655939)
Kial Douglas Stewart, Australian National University, Research School of Earth Science, Canberra, ACT, Australia, Matthew H England, Univ New South Wales, Sydney, Australia and Andrew M. Hogg, Australian National University, Canberra, ACT, Australia
Processes Responsible for the Southern Ocean Heat Uptake and Redistribution under Anthropogenic Warming (657543)
Kewei Lyu1, Xuebin Zhang1, John Church2 and Quran Wu3, (1)CSIRO, Oceans & Atmosphere, Centre for Southern Hemisphere Oceans Research (CSHOR), Hobart, TAS, Australia, (2)University of New South Wales, Climate Change Research Centre, Sydney, NSW, Australia, (3)University of Reading, National Centre for Atmospheric Science–Climate, Department of Meteorology, Reading, United Kingdom
Interior water-mass variability in the southern-hemisphere oceans during the last decade (658137)
Esther Portela Rodriguez, Nicolas Kolodziejczyk, Christophe Maes and Virginie Thierry, UBO, CNRS, IRD, Ifremer, Laboratoire d'Océanographie Physique et Spatiale, Plouzané, France, Plouzane, France
