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CATEGORIES:British Antarctic Survey
SUMMARY:The effect of ice shelf dynamics on marine ice she
 et stability -  Marianne Haseloff\,  University of
  Oxford
DTSTART;TZID=Europe/London:20180620T140000
DTEND;TZID=Europe/London:20180620T150000
UID:TALK106468AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/106468
DESCRIPTION:The West Antarctic Ice Sheet (WAIS) is a marine ic
 e sheet that rests on a bed below sea level. The s
 tability of a marine ice sheet and its contributio
 n to future sea level rise are controlled by the d
 ynamics of the grounding line\, where the grounded
  ice sheet transitions into a floating ice shelf. 
 Recent observations suggest that Antarctic ice she
 lves experience widespread thinning due to contact
  with warming ocean waters\, but quantifying the e
 ffect of these changes on marine ice sheet stabili
 ty and extent remains a major challenge for both o
 bservational and modelling studies. In this talk\,
  I provide an analytic expression for the ice flux
  at the grounding line of laterally confined marin
 e ice sheets. This approach allows us to investiga
 te how different calving laws change the stability
  of marine ice sheets. By combining these results 
 with recent work that parametrizes sub-shelf melti
 ng with buoyant plume models\, I obtain an algebra
 ic expression for the ice flux at the grounding li
 ne as a function of ice shelf properties (for exam
 ple ice shelf width and length) and leading order 
 oceanic conditions (represented by the ambient oce
 an temperature and salinity). This allows us to di
 rectly link the extent and stability of a marine i
 ce sheet to oceanic conditions. I will discuss the
  implications of these dependencies for projection
 s of the future evolution of the West Antarctic Ic
 e Sheet.
LOCATION:British Antarctic Survey\, Seminar Room 187
CONTACT:Dr Maria Vittoria Guarino
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