Séminaire : Mehmet Ilicak (Eurasia Institute of Earth Sciences, Istanbul Technical University, Istanbul, Turkey): Investigating possible mechanisms triggering Dansgaard-Oeschger\nEvents
Tuesday 29 May 2018, 11:00am - 12:00pm
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Abstract : Dansgaard-Oeschger (D-O) cycles are the most dramatic, frequent, and
wide-reaching abrupt climate changes in the geologic record. On Greenland, D-O cycles are characterized by an abrupt warming of 10± 5°C from a cold stadial to a warm interstadial phase, followed by gradual cooling before a rapid return
to stadial conditions. The mechanisms responsible for these millennial cycles are not fully understood.
Here, we investigate three different mechanisms whether or not they
induce a D-O event. These mechanisms are i) increasing the Southern Ocean winds, ii) strengthen the North Atlantic Subpolar Gyre iii) a warm pool anomaly in western Equatorial Pacific Ocean. We employ a fully coupled (atmosphere-ocean-land-seaice) climate model for the MIS3 climate. The results show that Southern
Ocean can change the Atlantic Overturning Circulation and induce a D-O event in
150 years.

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Location salle de réunion LOCEAN, tour 45/55, 4eme étage



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