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SUMMARY:Combining models and data for improved understanding of Antarctic 
 climate change - Dr Max Holloway\, British Antarctic Survey
DTSTART:20180308T131000Z
DTEND:20180308T140000Z
UID:TALK102184@talks.cam.ac.uk
CONTACT:Lorena Escudero
DESCRIPTION:The cryosphere has a significant influence on global climate\;
  sea ice is an important amplifier in the climate system and meltwater fro
 m polar ice sheets influences ocean circulation and the associated sea lev
 el rise directly affects coastal populations. However\, future model proje
 ctions of Antarctic Ice Sheet and sea ice change are highly uncertain. Our
  understanding of the long term (i.e. beyond the satellite era) interplay 
 between ice sheets\, sea ice and the climate system can be improved by exa
 mining how these systems responded during a range of past climates. In par
 ticular\, the last interglacial (LIG\; 130\,000 to 115\,000 years ago) all
 ows investigation of the ice sheet and sea ice response to warmer than pre
 sent conditions – similar to those projected for coming centuries.\n \nT
 his talk will demonstrate the combined use of climate model simulations an
 d Antarctic ice core and marine core data to better interpret past climate
  change. Novel methods of data-model comparison\, focussing on the LIG Ant
 arctic climate optimum (~128\,000 years ago)\, are used to assess the stab
 ility of the West Antarctic Ice Sheet (WAIS) and Southern Hemisphere sea i
 ce. We show that an early collapse of the WAIS is not consistent with Anta
 rctic ice core data. Instead\, a major retreat of Southern Hemisphere sea 
 ice best explains the ice and marine core data. By optimizing the model-da
 ta agreement\, we suggest that sea ice retreat was greatest in the Atlanti
 c sector of the Southern Ocean and weakest in the Pacific sector. Further 
 model investigation indicates that changes in global heat transport\, in r
 esponse to melting Northern Hemisphere ice sheets during the proceeding de
 glaciation\, likely caused heat build-up in the South Atlantic\, leading t
 o sea ice retreat and substantial Antarctic warming. These conditions may 
 have led to a collapse of the WAIS and sea ice build-up later during the L
 IG.
LOCATION:The Richard King Room\, Darwin College
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