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CATEGORIES:British Antarctic Survey - Polar Oceans seminar se
 ries
SUMMARY: Mesoscale eddies at the Antarctic margins:  Linki
 ng cross-shelf exchange with Southern Ocean overtu
 rning - Andrew Thompson\; Caltech
DTSTART;TZID=Europe/London:20130702T110000
DTEND;TZID=Europe/London:20130702T120000
UID:TALK46057AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/46057
DESCRIPTION:Previous idealized investigations of Southern Ocea
 n circulation have omitted its connection with the
  Antarctic continental shelves\, including its imp
 ortant role in bottom water formation.  The contri
 bution of mesoscale eddies in setting the stratifi
 cation and overturning circulation in the Antarcti
 c Circumpolar Current (ACC) is well established\, 
 yet their role in cross-shelf exchange of water ma
 sses remains unclear. We propose a residual -mean 
 theory that elucidates the connection between Anta
 rctic cross-shelf exchange and overturning in the 
 ACC\, and the contribution of mesoscale eddies to 
 the export of Antarctic Bottom Water (AABW). We mo
 tivate and verify our theory using an eddy-resolvi
 ng process model of a sector of the Southern Ocean
 . The strength and pattern of the simulated overtu
 rning circulation strongly resemble those of the r
 eal ocean\, and are closely captured by our residu
 al-mean theory. Over the continental slope barocli
 nic instability is suppressed\, and so transport b
 y mesoscale eddies is reduced. This results in a s
 trong sensitivity of the deep overturning strength
  to changes in near-shore winds.\n
LOCATION:British Antarctic Survey\, Room 330B
CONTACT:Dr Andrew Meijers
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