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SUMMARY: Geochemical Insights into Antarctic Ice Sheet Stability  - Carrie
  Lear\, Cardiff University
DTSTART:20230131T120000Z
DTEND:20230131T130000Z
UID:TALK176981@talks.cam.ac.uk
CONTACT:Oscar Branson
DESCRIPTION:Future sea level change is one of the most serious\, and yet p
 oorly constrained\, impacts of anthropogenic climate change. One of the is
 sues is the lack of observational data of very slow\, glacial processes\, 
 which makes it difficult to parameterise them accurately in ice sheet mode
 ls. Some attempts have therefore been made to “tune” ice sheet models 
 using palaeoclimate records\, and to use these tuned models to project fut
 ure sea level rise. However\, these projections are somewhat controversial
 \, largely because of the uncertainties associated with the past sea level
  reconstructions. Here I discuss some approaches to improve our reconstruc
 tions of past ice sheet variability using geochemical techniques. I also p
 resent some intriguing geochemical data and modelling results from the Oli
 gocene-Miocene Transition (~23 million years ago)\, which casts some doubt
  on the traditional way we view the evolution of Earth’s Cryosphere as a
  simple progression from greenhouse to unipolar icehouse\, to bipolar iceh
 ouse conditions. 
LOCATION:Department of Earth Sciences\, Tilley Lecture Theatre
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