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SUMMARY:Modelling the Last Glacial-Interglacial Cycle: How sensitive are p
 ast climates? - Paul Valdes\, School of Geographical Sciences\, University
  of Bristol
DTSTART:20170209T173000Z
DTEND:20170209T183000Z
UID:TALK69458@talks.cam.ac.uk
CONTACT:Dr Rachael Rhodes
DESCRIPTION:Understanding the mechanisms involved in Late Quaternary glaci
 al cycles is one of the ultimate challenges for palaeoclimate science. The
  driving cause of the variability is related to changes in the Earth's orb
 it but there are numerous feedbacks between the atmosphere\, ocean\, ice s
 heets and carbon cycle. Earth System Modelling can play an important role 
 in quantifying some of these feedbacks and helping us to determine the maj
 or components of change. Through a combined modelling and data approach\, 
  palaeoclimate studies improve our understanding of key processes and henc
 e contribute to improved confidence in future predictions. However\, palae
 oclimate studies have also attempted to directly estimate past climate sen
 sitivity to CO2\, a key parameter for future climate change. A key assumpt
 ion of such work is that climate sensitivity is unchanging\, so that knowi
 ng climate sensitivity in the past is relevant for climate sensitivity in 
 the future. The talk will describe a series of modelling simulations that 
 help us understand the feedback processes important during the last glacia
 l-interglacial cycle\, and show that the model relatively well represents 
 the changes observed in the proxy climate data. We further use the model t
 o investigate climate sensitivity. The simulations show that the sensitivi
 ty varies throughout the last 120\,000 years\, indicating that there are s
 erious limitations on direct estimates of future climate sensitivity from 
 palaeo-data. \n\nThis talk is part of the Quaternary Discussion Group (QDG
 )
LOCATION:Latimer Room (Old Court)\, Clare College\, Trinity Lane
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