Wickert, AD, Williams, C, Gregoire, LJ orcid.org/0000-0003-0258-7282 et al. (5 more authors) (2023) Marine-Calibrated Chronology of Southern Laurentide Ice Sheet Advance and Retreat: ∼2,000-Year Cycles Paced by Meltwater–Climate Feedback. Geophysical Research Letters, 50 (10). e2022GL100391. ISSN 0094-8276
Abstract
Climatic warming following the Last Glacial Maximum caused the southern Laurentide Ice Sheet (LIS) to begin ∼2,000-year cycles of retreat and readvance whose cause remains ambiguous. By developing a marine-calibrated chronology of southern LIS position, we counterintuitively demonstrate that between 17.6 and 11.3 ka, ice advanced during times of northern-hemisphere warming and retreated during times of northern-hemisphere cooling. Here we propose a cyclical feedback: Meltwater from ice retreat cooled the northern hemisphere by weakening the Atlantic Meridional Overturning Circulation (AMOC). This eventually lead to ice-sheet readvance, which reduced and rerouted meltwater discharge, and thereby allowed the AMOC to strengthen and the northern hemisphere to warm. Our data suggest that this antiphased ice–climate interaction, paced by ice-sheet response time, was initiated by synchronous warming and ice retreat ∼18.7–17.6 ka (corresponding to the Erie “Interstade”) and reached its apex during the Younger Dryas.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2023. The Authors. This is an open access article under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited. |
Keywords: | deglaciation, ocean circulation, North America, ice sheet, paleoclimate |
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 (Natural Environment Research Council) NE/T007443-1 NERC UNSPECIFIED NERC (Natural Environment Research Council) NE/K008536/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 20 Mar 2023 14:28 |
Last Modified: | 30 May 2023 22:37 |
Status: | Published |
Publisher: | Wiley |
Identification Number: | 10.1029/2022GL100391 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:196735 |