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SUMMARY:The effect of ice shelf dynamics on marine ice sheet stability -  
 Marianne Haseloff\,  University of Oxford
DTSTART:20180620T130000Z
DTEND:20180620T140000Z
UID:TALK106468@talks.cam.ac.uk
CONTACT:Dr Maria Vittoria Guarino
DESCRIPTION:The West Antarctic Ice Sheet (WAIS) is a marine ice sheet that
  rests on a bed below sea level. The stability of a marine ice sheet and i
 ts contribution to future sea level rise are controlled by the dynamics of
  the grounding line\, where the grounded ice sheet transitions into a floa
 ting ice shelf. Recent observations suggest that Antarctic ice shelves exp
 erience widespread thinning due to contact with warming ocean waters\, but
  quantifying the effect of these changes on marine ice sheet stability and
  extent remains a major challenge for both observational and modelling stu
 dies. In this talk\, I provide an analytic expression for the ice flux at 
 the grounding line of laterally confined marine ice sheets. This approach 
 allows us to investigate how different calving laws change the stability o
 f marine ice sheets. By combining these results with recent work that para
 metrizes sub-shelf melting with buoyant plume models\, I obtain an algebra
 ic expression for the ice flux at the grounding line as a function of ice 
 shelf properties (for example ice shelf width and length) and leading orde
 r oceanic conditions (represented by the ambient ocean temperature and sal
 inity). This allows us to directly link the extent and stability of a mari
 ne ice sheet to oceanic conditions. I will discuss the implications of the
 se dependencies for projections of the future evolution of the West Antarc
 tic Ice Sheet.
LOCATION:British Antarctic Survey\, Seminar Room 187
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