Ivanovic, RF orcid.org/0000-0002-7805-6018, Gregoire, LJ orcid.org/0000-0003-0258-7282, Wickert, AD et al. (2 more authors) (2017) Collapse of the North American ice saddle 14,500 years ago caused widespread cooling and reduced ocean overturning circulation. Geophysical Research Letters, 44 (1). pp. 383-392. ISSN 0094-8276
Abstract
Collapse of ice sheets can cause significant sea level rise and widespread climate change. We examine the climatic response to meltwater generated by the collapse of the Cordilleran-Laurentide ice saddle (North America) ~14.5 thousand years ago (ka) using a high-resolution drainage model coupled to an ocean-atmosphere-vegetation general circulation model. Equivalent to 7.26 m global mean sea level rise in 340 years, the meltwater caused a 6 sverdrup weakening of Atlantic Meridional Overturning Circulation (AMOC) and widespread Northern Hemisphere cooling of 1–5°C. The greatest cooling is in the Atlantic sector high latitudes during Boreal winter (by 5–10°C), but there is also strong summer warming of 1–3°C over eastern North America. Following recent suggestions that the saddle collapse was triggered by the Bølling warming event at ~14.7–14.5 ka, we conclude that this robust submillennial mechanism may have initiated the end of the warming and/or the Older Dryas cooling through a forced AMOC weakening.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016, The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use,distribution and reproduction in any medium, provided the original work is properly cited. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Inst for Climate & Atmos Science (ICAS) (Leeds) |
Funding Information: | Funder Grant number NERC UNSPECIFIED NERC NE/K008536/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 22 Dec 2016 10:24 |
Last Modified: | 23 Jun 2023 22:20 |
Published Version: | https://doi.org/10.1002/2016GL071849 |
Status: | Published |
Publisher: | American Geophysical Union |
Identification Number: | 10.1002/2016GL071849 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:109834 |