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SUMMARY:Using simple process models to examine Arctic Ocean dynamics under
  a changing climate - Peter Davis\, Department of Earth Sciences\, Univers
 ity of Oxford
DTSTART:20141001T100000Z
DTEND:20141001T110000Z
UID:TALK53349@talks.cam.ac.uk
CONTACT:Dr Alexander Brearley
DESCRIPTION:Many different components of the Arctic environment (e.g. sea 
 ice conditions\, P-­E\, river discharge\, atmospheric temperatures etc.)\
 , are	changing rapidly in response to the	warming climate\, and are all li
 kely to have a significant impact on the dynamics of the Arctic
  Ocean.	\n\nIn the first part of the talk I will	 discuss how these chang
 es are affecting the accumulation of freshwater within the Beaufort Gyre. 
 Recent observations show	 that the region has accumulated 8000 km3 of fres
 hwater since the	1990s\, and there is evidence that the accumulation may h
 ave accelerated since the early 2000s. Using a simple process model we fin
 d that this acceleration is associated with an enhancement in the efficien
 cy of momentum transfer into the upper ocean\, which is being driven b
 y the decline in Arctic sea ice cover.	\n \nIn the second part 
 of	 the talk I’ll discuss how increasing internal wave activity	d
 ue to the	 declining sea ice cover\, may enhance the magnitude of
  the heat flux from the Atlantic Water to the underside of the sea 
 ice. There is sufficient	heat contained within the	Atlantic Water to melt 
 all sea ice within the Arctic Ocean\, however\, it is	 isolated from 
 the surface by the cold halocline. Using a 1D model we investigate ho
 w much more heat may be brought to the surface as the increasing internal 
 wave activity destabilises the halocline\, resulting in a larger diffusive
  heat flux and allowing heat	 to be directly entrained into the surfac
 e mixed layer.	\n  	
LOCATION:British Antarctic Survey\, Room 307
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