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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:20180301T130000Z
DTEND:20180301T140000Z
UID:TALK96622@talks.cam.ac.uk
CONTACT:Amy McGuire
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 convec
 tion ahead of abrupt climate changes recorded in Greenland ice cores at th
 e onset and end of the Younger Dryas stadial (YD)\, which likely occurred 
 in response to gradual changes in freshwater forcing. Supported by transie
 nt climate model simulations\, our results also indicate a ~400-year delay
  in 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 format
 ion are precursors to large-scale climate and pCO2 changes\, highlighting 
 the need for improved long-term future AMOC projections.
LOCATION:Rm 101\, William Hardy Building\, Department of Geography\, Downi
 ng Site
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