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SUMMARY:Flow\, fracture and modelled stability of the Larsen C ice shelf -
  Bernd Kulessa (Swansea University)
DTSTART:20100303T163000Z
DTEND:20100303T173000Z
UID:TALK23317@talks.cam.ac.uk
CONTACT:Poul Christoffersen
DESCRIPTION:We modelled the flow of the Larsen C ice shelf using an adapte
 d continuum-mechanical model\, and applied a fracture criterion to the sim
 ulated velocities to investigate its present-day stability. Constraints co
 me from satellite data and geophysical measurements in the 2008-09 austral
  summer. We obtained excellent agreements between modelled and measured ic
 e-flow velocities\, and inferred and observed distributions of rifts and c
 revasses. Ice-shelf thickness was derived from BEDMAP and ICESat data and 
 depth-density profiles inferred from our seismic data. Notable exceptions 
 occur in regions of modelled basal accretion down flow of promontories\, t
 hus placing the first quantitative constraints on their mechanical effects
 . Anomalously soft marine ice\, advected into the ice shelf in flow-parall
 el bands\, controls rates of rift propagation downstream.\n     In this pr
 esentation I will assess the implications of these findings for the curren
 t stability of the Larsen C ice shelf\, as compared with the pre-collapse 
 dynamic evolution of the Larsen B ice shelf. I will also present initial a
 nalyses and findings from extensive ground-penetrating radar surveys in th
 e 2009-10 austral summer in a prominent zone of basal accretion down-flow 
 of the Joerg Peninsula.\n
LOCATION:Scott Polar Research Institute\, LIBRARY (1ST FLOOR)\, doors open
  for general access
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