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SUMMARY:Variability and drivers of the subpolar Southern Ocean circulation
  from satellite altimetry - Matthis Auger\, Sorbonne Université
DTSTART:20220316T140000Z
DTEND:20220316T150000Z
UID:TALK169244@talks.cam.ac.uk
CONTACT:Dr. Shenjie Zhou
DESCRIPTION:The subpolar Southern Ocean\, south of the Antarctic Circumpol
 ar Current\, hosts large circulation systems of importance for the product
 ion of water masses\, ocean interactions with sea-ice and ice-shelves\, an
 d consequently for global mean sea level. Observations are still sparse in
  that region\, particularly in wintertime when it is covered by sea ice. T
 hus\, the regional response of the subpolar Southern Ocean hydrography and
  circulation to interactions with the atmosphere\, cryosphere\, and backgr
 ound circulation at various spatial and time scales is still under active 
 research.\nHere\, I present the development and exploitation of an ocean t
 opography dataset from multimission satellite altimetry to investigate the
  variability of the subpolar Southern Ocean circulation and its drivers. T
 his dataset spans six years of daily sea level anomaly maps over the whole
  Southern Ocean south of 50°S. It allows the exploration of the variabili
 ty of the subpolar Southern Ocean circulation\, particularly the seasonal 
 cycle of the large-scale circulation and the mesoscale variability under s
 ea ice. At the seasonal scale\, the circulation of the Weddell and Ross gy
 res\, and the Antarctic Slope Current are mainly dictated by three modes o
 f variability\, principally linked to the surface stress of the wind on th
 e surface of the ocean and its modulation by the sea ice.  The mesoscale v
 ariability is investigated as well using an eddy detection and tracking al
 gorithm. This mesoscale variability is weak outside the energetic Antarcti
 c slope current in the pack ice\, while the marginal ice zone seems to be 
 a region with enhanced cyclonic eddies generation.
LOCATION:https://ukri.zoom.us/j/96468249588\; BAS seminar room 330b
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