Marine‐Calibrated Chronology of Southern Laurentide Ice Sheet Advance and Retreat: ∼2,000‐Year Cycles Paced by Meltwater–Climate Feedback
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...
Published in: | Geophysical Research Letters |
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2023
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5022409 2023-09-05T13:20:14+02:00 Marine‐Calibrated Chronology of Southern Laurentide Ice Sheet Advance and Retreat: ∼2,000‐Year Cycles Paced by Meltwater–Climate Feedback Wickert, A. Williams, C. Gregoire, L. Callaghan, K. Ivanović, R. Valdes, P. Vetter, L. Jennings, C. 2023 application/pdf https://gfzpublic.gfz-potsdam.de/pubman/item/item_5022409 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5022409_1/component/file_5022422/5022409.pdf unknown info:eu-repo/semantics/altIdentifier/doi/10.1029/2022GL100391 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5022409 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5022409_1/component/file_5022422/5022409.pdf info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/ Geophysical Research Letters info:eu-repo/semantics/article 2023 ftgfzpotsdam https://doi.org/10.1029/2022GL100391 2023-08-13T23:41:24Z 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. Article in Journal/Newspaper Ice Sheet GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Geophysical Research Letters 50 10 |
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Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
unknown |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Wickert, A. Williams, C. Gregoire, L. Callaghan, K. Ivanović, R. Valdes, P. Vetter, L. Jennings, C. |
spellingShingle |
Wickert, A. Williams, C. Gregoire, L. Callaghan, K. Ivanović, R. Valdes, P. Vetter, L. Jennings, C. Marine‐Calibrated Chronology of Southern Laurentide Ice Sheet Advance and Retreat: ∼2,000‐Year Cycles Paced by Meltwater–Climate Feedback |
author_facet |
Wickert, A. Williams, C. Gregoire, L. Callaghan, K. Ivanović, R. Valdes, P. Vetter, L. Jennings, C. |
author_sort |
Wickert, A. |
title |
Marine‐Calibrated Chronology of Southern Laurentide Ice Sheet Advance and Retreat: ∼2,000‐Year Cycles Paced by Meltwater–Climate Feedback |
title_short |
Marine‐Calibrated Chronology of Southern Laurentide Ice Sheet Advance and Retreat: ∼2,000‐Year Cycles Paced by Meltwater–Climate Feedback |
title_full |
Marine‐Calibrated Chronology of Southern Laurentide Ice Sheet Advance and Retreat: ∼2,000‐Year Cycles Paced by Meltwater–Climate Feedback |
title_fullStr |
Marine‐Calibrated Chronology of Southern Laurentide Ice Sheet Advance and Retreat: ∼2,000‐Year Cycles Paced by Meltwater–Climate Feedback |
title_full_unstemmed |
Marine‐Calibrated Chronology of Southern Laurentide Ice Sheet Advance and Retreat: ∼2,000‐Year Cycles Paced by Meltwater–Climate Feedback |
title_sort |
marine‐calibrated chronology of southern laurentide ice sheet advance and retreat: ∼2,000‐year cycles paced by meltwater–climate feedback |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5022409 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5022409_1/component/file_5022422/5022409.pdf |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Geophysical Research Letters |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2022GL100391 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5022409 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5022409_1/component/file_5022422/5022409.pdf |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1029/2022GL100391 |
container_title |
Geophysical Research Letters |
container_volume |
50 |
container_issue |
10 |
_version_ |
1776200944023764992 |