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SUMMARY:Why was the Arctic sea ice free 127 000 years ago? - Dr. Louise Si
 me ( British Antarctic Survey)
DTSTART:20241023T163000Z
DTEND:20241023T180000Z
UID:TALK223222@talks.cam.ac.uk
CONTACT:91369
DESCRIPTION:Recent results confirm that the last time the Arctic was sea i
 ce-free occurred 127\,000 years ago. Until recently\, climate models have 
 struggled to simulate a complete loss of Arctic summer sea ice during the 
 Last Interglacial (LIG). Given the significantly higher summer insolation 
 at that time\, there is strong motivation to closely examine this period a
 nd conduct climate model simulations to assess whether models can accurate
 ly capture the extreme warming and sea ice loss that previous simulations 
 failed to replicate. In this talk\, as well as the evidence for a sea ice 
 free Arctic\, I will present the new Intergovernmental Panel on Climate Ch
 ange (IPCC) Seventh Assessment Report (AR7) Coupled Model Intercomparison 
 Project (CMIP7)–Paleoclimate Model Intercomparison Project (PMIP) FastTr
 ack abrupt-127k protocol\, which aims to address these challenges. By impr
 oving our understanding of model performance in this out-of-sample test\, 
 the FastTrack results should provide crucial insights into: key model phys
 ics\; why the Arctic was sea ice free\; and future Arctic sea ice model-de
 rived projections.
LOCATION:Latimer Room\, Clare College
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