HE42B:
Mechanisms for Variability, Circulation, and Transformation of Water Masses in the Southern Ocean II

Session ID#: 92361

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.
Co-Sponsor(s):
  • OB - Ocean Biology and Biogeochemistry
  • PL - Physical Oceanography: Mesoscale and Larger
  • PS - Physical Oceanography: Mesoscale and Smaller
Index Terms:

4215 Climate and interannual variability [OCEANOGRAPHY: GENERAL]
4283 Water masses [OCEANOGRAPHY: GENERAL]
4520 Eddies and mesoscale processes [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, United States
Primary Liaison:  Annie Foppert, University of Rhode Island, Narragansett, RI, United States
Moderators:  Annie Foppert, University of Rhode Island, Narragansett, RI, United States and Dafydd Gwyn Evans, University of Southampton, Southampton, SO14, United Kingdom
Student Paper Review Liaison:  Edward Doddridge, University of Oxford, Oxford, United Kingdom

Abstracts Submitted to this Session:

A New Estimate of the Southern Ocean Meridional Overturning Circulation from Argo Float Observations (498161)
Alison R Gray and Stephen Riser, University of Washington, School of Oceanography, Seattle, WA, United States
Variability and controls of the interior density structure of the Southern Ocean (645657)
Raquel Somavilla, Spanish Institute of Oceanography (IEO, CSIC), Physical Oceanography, Santander, Spain, Alberto Naveira Garabato, University of Southampton, Ocean and Earth Science, Southampton, United Kingdom, Cesar González-Pola, Spanish Institute of Oceanography, Physical Oceanography, Gijon, Spain and Julio Manuel Fernandez, University of Oviedo, Applied Physics, Oviedo, Spain
Interior water-mass variability in the southern-hemisphere oceans during the last decade (658137)
Esther Portela Rodriguez1, Nicolas Kolodziejczyk1, Christophe Maes1 and Virginie Thierry2, (1)UBO, CNRS, IRD, Ifremer, Laboratoire d'Océanographie Physique et Spatiale, Plouzané, France, Plouzane, France, (2)Univ Brest, Ifremer, CNRS, IRD, LOPS, Plouzané, France
A see-saw in Pacific Subantarctic Mode Water formation driven by atmospheric modes (643342)
Andrew Meijers, NERC British Antarctic Survey, Cambridge, United Kingdom, Ivana Cerovecki, Scripps Institute of Oceanography, La Jolla, CA, United States, Brian A. King, National Oceanography Centre, Southampton, United Kingdom and Veronica Tamsitt, University of South Florida, College of Marine Science, Saint Petersburg, United States
Ventilation and carbon uptake in the southern oceans: Response to wind stress changes (642119)
Darryn Waugh, Johns Hopkins University, Department of Earth and Planetary Sciences, Baltimore, 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, Research School of Earth Sciences, Canberra, ACT, Australia
Using Lagrangian Transit Time Distributions to investigate eddy effects on Carbon uptake in the Southern Ocean (650958)
Manita Chouksey1, Alexa Griesel2, Carsten Eden1 and Reiner Steinfeldt3, (1)University of Hamburg, Institute of Oceanography, Hamburg, Germany, (2)University of Hamburg, Institute of Oceanography, Germany, (3)University of Bremen, Bremen, Germany
A Continental Shelf Pump for CO2 on the Adélie Land Coast, East Antarctica (653660)
Mar Arroyo1, Elizabeth Shadwick2, Bronte D Tilbrook2 and Kazuya Kusahara3, (1)Virginia Institute of Marine Science, Gloucester Point, VA, United States, (2)CSIRO Marine and Atmospheric Research, Hobart, TAS, Australia, (3)JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan