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SUMMARY:Focussing on the peripheral: grounding lines\, coastal stress-boun
 daries\, and the inside-out ice sheet. - Rob Arthern\, British Antarctic S
 urvey
DTSTART:20070807T150000Z
DTEND:20070807T160000Z
UID:TALK7786@talks.cam.ac.uk
CONTACT:Deb Shoosmith
DESCRIPTION:Recent theories of the coastal flow of ice sheets have propose
 d that there is a boundary region where the stress within the ice makes a 
 transition from extending flow\, characteristic of ice shelves\, to sheari
 ng flow\, characteristic of the grounded ice sheet. The details of this tr
 ansition have recently been illuminated by three new theories\, each corre
 sponding to a distinct limiting case (Schoof\, 2007\; http://www.eos.ubc.c
 a/~cschoof/groundingline.pdf). To apply these mathematical advances in pre
 dicting the Antarctic contribution to sea level we need to know which theo
 ry most closely resembles the real world. Another complication is that\, i
 n plan view\, grounding lines are curves\, not straight lines\, so we will
  also need to extend the theory from two dimensions to three. This talk gi
 ves some background to the problem of predicting the ice sheet\, introduce
 s the recent theoretical research on grounding lines\, and presents some s
 atellite and airborne observations from the Amundsen Sea sector that can h
 elp us to choose the appropriate limiting case for this part of West Antar
 ctica. It also describes some progress towards extending the theory to 3D\
 , beginning with an axisymmetric ice sheet. The axysymmetric model can des
 cribe laterally diverging flow (with ice flowing radially outwards towards
  an ocean) or laterally converging flow (where the ice flows radially inwa
 rds towards a small central ocean). The latter case provides an analogue f
 or inwardly curved embayments\, such as Pine Island Bay.
LOCATION:British Antarctic Survey
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