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SUMMARY:The ice-covered Ross Gyre: variability and drivers - Tiago Dotto\,
  National Oceanography Centre
DTSTART:20180418T100000Z
DTEND:20180418T110000Z
UID:TALK104251@talks.cam.ac.uk
CONTACT:Caroline Holmes
DESCRIPTION:Radar altimetry is used to document year-round variability in 
 the Ross Gyre (RG)\, Antarctica\, during 2011-2015. The RG is characterize
 d by a bounded recirculating component\, and a westward ‘throughflow’ 
 to the south. Maximum Covariance Analysis of the sea-surface height (SSH) 
 and ocean surface stress curl reveals two modes of variability. The first 
 represents a large-scale SSH change forced by the Antarctic Oscillation. T
 he second represents semiannual variability in gyre area and strength\, dr
 iven by fluctuations in sea level pressure associated with the Amundsen Se
 a Low (ASL). Variability in the throughflow is also linked to the ASL. An 
 adequate description of the oceanic circulation is achieved only when sea 
 ice drag is accounted for in the ocean surface stress. The drivers of RG v
 ariability unveiled here bear strongly on our understanding of the oceanic
  forcing of Antarctic Ice Sheet melting\, and of the downstream propagatio
 n of its ocean freshening footprint.
LOCATION:British Antarctic Survey\, Innovation Centre\, Seminar Room 1
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