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SUMMARY:Deep-water circulation changes lead North Atlantic climate during 
 deglaciation - Francesco Muschitiello\, Department of Geography\, Universi
 ty of Cambridge
DTSTART:20180306T140000Z
DTEND:20180306T150000Z
UID:TALK101089@talks.cam.ac.uk
CONTACT:Max Holloway
DESCRIPTION:Constraining the response time of the climate system to change
 s in Atlantic Meridional Overturning Circulation (AMOC) is essential to im
 proving future climate predictability. Here we present a precise synchroni
 zation of terrestrial\, marine\, and ice-core records\, which allows for t
 he first time a quantitative determination of the response time of North A
 tlantic climate to changes in AMOC strength during the last deglaciation. 
 Using a continuous record of deep-water ventilation from the Nordic Seas\,
  we identify a systematic  300-year lead of changes in deep-water convecti
 on ahead of abrupt climate changes recorded in Greenland ice cores at the 
 onset and end of the Younger Dryas stadial (YD)\, which likely occurred in
  response to gradual changes in freshwater forcing. Supported by transient
  climate model simulations\, our results also indicate a ~400-year delay i
 n the rise of atmospheric CO2 in response to AMOC slowdown at the start of
  the YD. We conclude that variations in North Atlantic deep-water formatio
 n are precursors to large-scale climate and pCO2 changes\, highlighting th
 e need for improved long-term future AMOC projections.
LOCATION:British Antarctic Survey\, Innovation Centre\, Seminar Room 1
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