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SUMMARY:Reproducing unexpected LGM ice-stream retreat behaviour in a dynam
 ic numerical model of Marguerite Bay\, Antarctica - Dr Stewart Jamieson\, 
 Durham University
DTSTART:20130116T163000Z
DTEND:20130116T173000Z
UID:TALK40733@talks.cam.ac.uk
CONTACT:Steven Palmer
DESCRIPTION:Geophysical mapping of the sea floor in Marguerite Bay\, Antar
 ctica\, has led to the identification of a series of grounding zone wedges
  which represent the locations of palaeo grounding lines during retreat fr
 om maximum ice stream extent. This data indicates that during rapid retrea
 t following the LGM\, the ice stream grounding line stabilised multiple ti
 mes on a bed that deepens inland. According to the marine ice sheet instab
 ility theory\, these stabilisations should not be expected. We use a numer
 ical flowband model which can robustly calculate groundine line behaviour 
 over time to reproduce the retreat pattern inferred from the seafloor. We 
 conduct a series of sensitivity tests to determine what controlled groundi
 ng line motion and stability\, and to understand what drove wider retreat 
 behaviour in Marguerite Bay. Our findings have implications for understand
 ing past retreat dynamics in other regions\, and for making future predict
 ions of ice sheet stability.
LOCATION:Scott Polar Research Institute\, main lecture theatre
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