Transient Simulation of Last Deglaciation with a New Mechanism for Bolling-Allerod Warming
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Material Information

Title:
Transient Simulation of Last Deglaciation with a New Mechanism for Bolling-Allerod Warming
Series Title:
Science Magazine
Creator:
Z. Liu
B.L. Otto-Bliesner
F. He
E.C. Brady
R. Tomas
P.U. Clark
A. E. Carlson
J. Lynch- Stieglitz
W. Curry
E. Brook
D. Erickson
R. Jacob
J. Kutzbach
J. Cheng
Publisher:
American Association for the Advancement of Science
Publication Date:
Language:
English

Notes

Abstract:
We conducted the first synchronously coupled atmosphere-ocean general circulation model simulation from the Last Glacial Maximum to the Bølling-Allerød (BA) warming. Our model reproduces several major features of the deglacial climate evolution, suggesting a good agreement in climate sensitivity between the model and observations. In particular, our model simulates the abrupt BA warming as a transient response of the Atlantic meridional overturning circulation (AMOC) to a sudden termination of freshwater discharge to the North Atlantic before the BA. In contrast to previous mechanisms that invoke AMOC multiple equilibrium and Southern Hemisphere climate forcing, we propose that the BA transition is caused by the superposition of climatic responses to the transient CO2 forcing, the AMOC recovery from Heinrich Event 1, and an AMOC overshoot.

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Source Institution:
Florida International University
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