Subsurface ocean warming preceded Heinrich Events
Although the global environmental impact of Laurentide Ice-Sheet destabilizations on glacial climate during Heinrich Events is well-documented, the mechanism driving these ice-sheet instabilities remains elusive. Here we report foraminifera-based subsurface (~150 m water depth) ocean temperature and...
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ftpubmed:oai:pubmedcentral.nih.gov:9304376 2023-05-15T15:06:04+02:00 Subsurface ocean warming preceded Heinrich Events Max, Lars Nürnberg, Dirk Chiessi, Cristiano M. Lenz, Marlene M. Mulitza, Stefan 2022-07-21 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9304376/ http://www.ncbi.nlm.nih.gov/pubmed/35864111 https://doi.org/10.1038/s41467-022-31754-x en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9304376/ http://www.ncbi.nlm.nih.gov/pubmed/35864111 http://dx.doi.org/10.1038/s41467-022-31754-x © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . CC-BY Nat Commun Article Text 2022 ftpubmed https://doi.org/10.1038/s41467-022-31754-x 2022-07-31T02:32:22Z Although the global environmental impact of Laurentide Ice-Sheet destabilizations on glacial climate during Heinrich Events is well-documented, the mechanism driving these ice-sheet instabilities remains elusive. Here we report foraminifera-based subsurface (~150 m water depth) ocean temperature and salinity reconstructions from a sediment core collected in the western subpolar North Atlantic, showing a consistent pattern of rapid subsurface ocean warming preceding the transition into each Heinrich Event identified in the same core of the last 27,000 years. These results provide the first solid evidence for the massive accumulation of ocean heat near the critical depth to trigger melting of marine-terminating portions of the Laurentide Ice Sheet around Labrador Sea followed by Heinrich Events. The repeated build-up of a subsurface heat reservoir in the subpolar Atlantic closely corresponds to times of weakened Atlantic Meridional Overturning Circulation, indicating a precursor role of ocean circulation changes for initiating abrupt ice-sheet instabilities during Heinrich Events. We infer that a weaker ocean circulation in future may result in accelerated interior-ocean warming of the subpolar Atlantic, which could be critical for the stability of modern, marine-terminating Arctic glaciers and the freshwater budget of the North Atlantic. Text Arctic Foraminifera* Ice Sheet Labrador Sea North Atlantic PubMed Central (PMC) Arctic Nature Communications 13 1 |
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Article Max, Lars Nürnberg, Dirk Chiessi, Cristiano M. Lenz, Marlene M. Mulitza, Stefan Subsurface ocean warming preceded Heinrich Events |
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Article |
description |
Although the global environmental impact of Laurentide Ice-Sheet destabilizations on glacial climate during Heinrich Events is well-documented, the mechanism driving these ice-sheet instabilities remains elusive. Here we report foraminifera-based subsurface (~150 m water depth) ocean temperature and salinity reconstructions from a sediment core collected in the western subpolar North Atlantic, showing a consistent pattern of rapid subsurface ocean warming preceding the transition into each Heinrich Event identified in the same core of the last 27,000 years. These results provide the first solid evidence for the massive accumulation of ocean heat near the critical depth to trigger melting of marine-terminating portions of the Laurentide Ice Sheet around Labrador Sea followed by Heinrich Events. The repeated build-up of a subsurface heat reservoir in the subpolar Atlantic closely corresponds to times of weakened Atlantic Meridional Overturning Circulation, indicating a precursor role of ocean circulation changes for initiating abrupt ice-sheet instabilities during Heinrich Events. We infer that a weaker ocean circulation in future may result in accelerated interior-ocean warming of the subpolar Atlantic, which could be critical for the stability of modern, marine-terminating Arctic glaciers and the freshwater budget of the North Atlantic. |
format |
Text |
author |
Max, Lars Nürnberg, Dirk Chiessi, Cristiano M. Lenz, Marlene M. Mulitza, Stefan |
author_facet |
Max, Lars Nürnberg, Dirk Chiessi, Cristiano M. Lenz, Marlene M. Mulitza, Stefan |
author_sort |
Max, Lars |
title |
Subsurface ocean warming preceded Heinrich Events |
title_short |
Subsurface ocean warming preceded Heinrich Events |
title_full |
Subsurface ocean warming preceded Heinrich Events |
title_fullStr |
Subsurface ocean warming preceded Heinrich Events |
title_full_unstemmed |
Subsurface ocean warming preceded Heinrich Events |
title_sort |
subsurface ocean warming preceded heinrich events |
publisher |
Nature Publishing Group UK |
publishDate |
2022 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9304376/ http://www.ncbi.nlm.nih.gov/pubmed/35864111 https://doi.org/10.1038/s41467-022-31754-x |
geographic |
Arctic |
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Arctic |
genre |
Arctic Foraminifera* Ice Sheet Labrador Sea North Atlantic |
genre_facet |
Arctic Foraminifera* Ice Sheet Labrador Sea North Atlantic |
op_source |
Nat Commun |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9304376/ http://www.ncbi.nlm.nih.gov/pubmed/35864111 http://dx.doi.org/10.1038/s41467-022-31754-x |
op_rights |
© The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
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CC-BY |
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https://doi.org/10.1038/s41467-022-31754-x |
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Nature Communications |
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13 |
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