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SUMMARY:Detecting reversible retreat and readvance of the Antarctic Ice Sh
 eet during the Holocene - Joanne Johnson\, British Antarctic Survey
DTSTART:20250507T163000Z
DTEND:20250507T180000Z
UID:TALK231610@talks.cam.ac.uk
CONTACT:91369
DESCRIPTION:Several lines of geological evidence from both the marine and 
 terrestrial record tell us that the Antarctic Ice Sheet was much bigger th
 an present at the Last Glacial Maximum. Determining how it has changed in 
 both thickness and extent since then\, in particular whether it has underg
 one any major fluctuations in the last few thousand years\, is important f
 or validating ice sheet and glacial-isostatic adjustment models that are u
 sed to project future sea level rise. \n\nIn this talk\, I will present an
  overview of the emerging evidence for large-scale reversible retreat of t
 he Antarctic Ice Sheet during the mid to late Holocene period. I will disc
 uss the methods with which we can further investigate this phenomenon and 
 present a case study from the Amundsen Sea sector illustrating how cosmoge
 nic nuclide measurements in subglacial bedrock reveal regrowth of the Pine
  Island-Thwaites Glacier system from a smaller than present configuration 
 in the Holocene. Direct evidence for reversible retreat from this and othe
 r locations in Antarctica is urgently needed in order to understand what d
 rives regrowth of ice sheets in warm climates and the conditions under whi
 ch ongoing retreat could be reversed.\n
LOCATION: Harker 1\, Department of Earth Sciences\, Downing Street
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