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SUMMARY:Antarctic summer sea-ice variability reconstructed from novel biol
 ogical archives - Erin McClymont\, Durham University
DTSTART:20240206T120000Z
DTEND:20240206T130000Z
UID:TALK210187@talks.cam.ac.uk
CONTACT:Dr Rachael Rhodes
DESCRIPTION:Antarctic sea ice is a critical component of the climate syste
 m\, affecting a range of physical and biogeochemical feedbacks\, and suppo
 rting unique ecosystems.  During the Last Glacial period\, Antarctic sea i
 ce was more extensive than today\, but uncertainties remain in geological 
 (marine sediments)\, glaciological (ice core)\, and climate model reconstr
 uctions of past sea-ice extent.\n\nHere\, we present a novel archive of pa
 st sea-ice environments from regurgitated stomach oils of snow petrels (Pa
 godroma nivea)\, recovered from breeding colonies in Dronning Maud Land\, 
 Antarctica. Our reconstructions span the last ~50\,00 years\, during which
  time Antarctic sea ice expanded to its maximum extent\, then retreated fr
 om the Last Glacial Maximum and the Holocene. In this talk I'll outline ho
 w we are unpicking the complex multi-proxy signals of diet and environment
 al change\, and how these might link to changes in the Antarctic ice sheet
  and Southern Ocean circulation over the same time intervals. 
LOCATION:Department of Earth Sciences\, Tilley Lecture Theatre
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