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SUMMARY:Modeling and understanding of Quaternary climate cycles    - Andre
 y Ganopolski\, Potsdam Institute for Climate Impact Research
DTSTART:20180222T173000Z
DTEND:20180222T183000Z
UID:TALK95407@talks.cam.ac.uk
CONTACT:Dr Rachael Rhodes
DESCRIPTION:In spite of significant progress achieved in recent decades in
  understanding of Quaternary climate dynamics\, there are still a number o
 f important questions remained to be answered. Among them is the cause of 
 Mid-Pleistocene transition (MPT). To address this questions we used the Ea
 rth system model of intermediate complexity CLIMBER-2 which incorporates a
 ll major components of the Earth system – atmosphere\, ocean\, land surf
 ace\, northern hemisphere ice sheets\, terrestrial biota and soil carbon\,
  aeolian dust and marine biogeochemistry. We performed a set of simulation
 s covering the entire Quaternary using as the only forcing variations in E
 arth orbital parameters and gradually evolving in time land-ocean distribu
 tion and terrestrial sediment cover. We found that a gradual removal of te
 rrestrial sediment from the Northern Hemisphere continent by glacial proce
 sses is sufficient to explain transition from 40-ka to 100-ka worlds aroun
 d the MPT. Gradual change in volcanic outgassing or weathering rate during
  Quaternary is required to explain early Pleistocene climate dynamics. Our
  results strongly suggest that Quaternary glacial cycles are externally fo
 rced and almost deterministic.  \n\nQuaternary Discussion Group seminar
LOCATION:Latimer Room (Old Court)\, Clare College\, Trinity Lane
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