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SUMMARY:Sensitivity of Dense Shelf Water formation to ice shelf melting --
  a modelling study - Eva Cougnon\, University of Tasmania
DTSTART:20140828T100000Z
DTEND:20140828T110000Z
UID:TALK53653@talks.cam.ac.uk
CONTACT:Dr Dan Jones
DESCRIPTION:Given the importance of the overturning circulation to global 
 climate\, there is a need to improve our understanding of Antarctic Bottom
  Water (AABW) formation and its sensitivity to change. The AABW has been o
 bserved to freshen and decrease in volume over the past few decades. This 
 modelling study focuses on the potential freshening of Dense Shelf Water (
 DSW)\, which contributes to the formation of AABW\, by increased melting o
 f ice-shelves in response to global warming.\nOcean observations show the 
 importance of coastal latent heat polynyas near the Mertz Glacier Tongue (
 MGT) to the formation of DSW and associated AABW production. A recent mode
 lling study in this region has shown the importance of the polynya activit
 y and ocean/ice-shelf interaction on DSW formation and export. Also\, ice 
 shelf melt can be modulated by intrusion of relatively warm Circumpolar De
 ep Water (CDW) onto the continental shelf which can further freshen DSW. H
 ere\, we present preliminary results from idealised numerical experiments 
 designed to test the sensibility of DSW formation to variability in both s
 urface fluxes (polynya activity and sea ice formation rates) and ice shelf
  melting. This study also shows that the inflow of CDW onto the continenta
 l shelf can be related with the strength of the vertical convection within
  the water column due to the dense water formation by sea ice formation.
LOCATION:British Antarctic Survey\, Room 307
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