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SUMMARY:Hybrid basal motion of the Greenlandic Ice Sheet (and also probabl
 y some Antarctic glaciers).  - Robert Law\, University of Cambridge
DTSTART:20211207T130000Z
DTEND:20211207T140000Z
UID:TALK165670@talks.cam.ac.uk
CONTACT:Dr Alex Bradley
DESCRIPTION:Uncertainty related to the mechanics of the fast motion of the
  Greenland Ice Sheet plagues predictions of sea level rise. A large part o
 f this uncertainty is tied to which constitutive relationship and associat
 ed parameters should be used to describe basal sliding. This talk looks at
  new results from high-resolution modelling over 4 by 8 km domains\, incor
 porating temperate ice rheology and statistically realistic bed topography
 \, which demonstrate that basal sliding exhibits large variability\, from 
 <10% to >90% over sub-kilometre distances. This indicates that basal motio
 n is better considered as the sum of basal sliding and ice deformation wit
 hin a basal temperate ice boundary layer that\, in agreement with field st
 udies\, varies in thickness from <10 m to >100 m in response to changes in
  basal topography. While this work focusses on the Greenland Ice Sheet it 
 is likely that these findings also apply to Isbræ-type outlet glaciers in
  Antarctica which have similar roughness characteristics.\n
LOCATION:BAS Cambridge Conference Room (and online)
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