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SUMMARY:The response of Antarctic marine ice streams to strong ocean forci
 ng - a modelling approach - Dr. Daniel Goldberg (University of Edinburgh)
DTSTART:20130815T140000Z
DTEND:20130815T150000Z
UID:TALK46706@talks.cam.ac.uk
CONTACT:Rosie Williams
DESCRIPTION:In recent years it has become apparent that circulation of war
 m ocean water under ice shelves in the Amundsen Sector of West Antarctica 
 has lead to large amounts of mass loss from the shelves\, and subsequently
  to acceleration and loss of grounded ice mass due to diminished ice shelf
  buttressing. The observational dataset for this region continues to grow\
 , deepening our understanding of the system. Yet there are some questions 
 -- regarding\, for instance\, the timescales on which ocean circulation an
 d ice shelf morphology co-evolve\, and the sensitivity of grounded ice to 
 spatial patterns in melt rates -- that are best answered by a modelling ap
 proach. \n\nTo this end\, experiments have been run with an idealized mode
 l of a coupled ice stream-ice shelf-ocean system\, in which the shelf cavi
 ty is perturbed by far-field ocean conditions. A strong\, nonlinear sensit
 ivity of grounded ice to ocean temperature is seen\, owing to the role of 
 ice-ocean interactions in the ice shelf shear margin -- even though this i
 s not where melt rates are largest. This "structural weakness" is demonstr
 ated through sensitivity experiments with an adjoint model\, and is furthe
 r shown to be a real feature of Pine Island Ice Shelf\, raising questions 
 about where under ice shelves melt rate variability is important\, from a 
 glaciological perspective.\n
LOCATION:British Antarctic Survey\, Room 187
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