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SUMMARY:Variability of Circumpolar Deep Water transport onto the Amundsen 
 Sea shelf - Karen M. Assmann (BAS)
DTSTART:20111012T100000Z
DTEND:20111012T110000Z
UID:TALK31934@talks.cam.ac.uk
CONTACT:Povl Abrahamsen
DESCRIPTION:Oceanic heat transport has been identified as a critical contr
 ol on the mass balance of the West Antarctic ice sheet. Circumpolar Deep W
 ater (CDW) with temperatures several degrees above the freezing point has 
 been observed in the ice-shelf cavities within the Amundsen Sea embayment.
  Its transport onto the continental shelf appears to occur principally wit
 hin several glacial troughs that intersect the shelf break. In view of the
  recent thinning observed in the glaciers terminating in the Amundsen Sea 
 embayment\, it is crucial to identify changes in the CDW transport onto th
 e shelf and the mechanisms controlling it. Until recent years the Amundsen
  Sea has been a region sparse in oceanographic data due to its heavy sea-i
 ce cover. A submarine trough at the central Amundsen Sea shelf break offer
 s the most complete set of observations to identify inter-annual changes i
 n on-shelf CDW transport over the past 15 years and we will therefore focu
 s our analysis here. The available data in the trough now includes two ful
 l occupations in 2003 and 2006 and scattered stations between 1994 and 200
 9. We use these observations and results from a numerical model to assess 
 the effect of changes in circulation and water-mass composition on the on-
 shelf heat transport in this region and discuss processes that might accou
 nt for these changes.
LOCATION:British Antarctic Survey\, Room 330B
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