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

Liu, Z.; Otto-Bliesner, B. L.; He, F.; Brady, E. C.; Tomas, R.; Clark, P. U.; Carlson, A. E.; Lynch-Stieglitz, J.; Curry, W.; Brook, E.; Erickson, D.; Jacob, R.; Kutzbach, J.; Cheng, J.

doi:10.1126/science.1171041

Title: Transient Simulation of Last Deglaciation with a New Mechanism for Bolling-Allerod Warming

Journal Article · Thu Jul 16 00:00:00 EDT 2009 · Science

DOI:https://doi.org/10.1126/science.1171041· OSTI ID:1564666

Liu, Z.; Otto-Bliesner, B. L.; He, F.; Brady, E. C.; Tomas, R.; Clark, P. U.; Carlson, A. E.; Lynch-Stieglitz, J.; Curry, W.; Brook, E.; Erickson, D.; Jacob, R.; Kutzbach, J.; Cheng, J.

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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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE Office of Science (SC)

OSTI ID:: 1564666

Journal Information:: Science, Vol. 325, Issue 5938; ISSN 0036-8075

Publisher:: AAAS

Country of Publication:: United States

Language:: English

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