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SUMMARY:Dynamics of Marine Ice Sheets - Prof Grae Worster (DAMPT\, Univers
 ity of Cambridge)
DTSTART:20190215T130000Z
DTEND:20190215T140000Z
UID:TALK117658@talks.cam.ac.uk
CONTACT:Joseph Ibrahim
DESCRIPTION:On short length and time scales\, ice behaves as a brittle\, e
 lastic solid but on continental length scales and timescales of years or l
 onger\, ice flows as a viscous fluid. The West Antarctic Ice Sheet\, for e
 xample\, sits on bedrock that is 1–2 kilometres below sea level. The ice
  itself is 4–5 kilometres thick in the central regions but thins as it f
 lows towards the margins and eventually becomes thin enough to float on th
 e ocean as a so-called ice shelf. The locus of detachment from the bedrock
 \, where the ice sheet first starts to float\, is called the grounding lin
 e. The position of the grounding line is determined dynamically\, and ther
 e is concern to understand the conditions under which the grounding line w
 ould recede and allow the ice sheet to flow ever faster into the ocean\, c
 ausing global sea levels to rise. I will present some simple fluid-mechani
 cal experiments and mathematical models to address some of the fundamental
  physical balances that control the stability of grounding lines.
LOCATION:JDB Seminar Room\, CUED
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