Greenland ice mass loss during the Younger Dryas driven by Atlantic Meridional Overturning Circulation feedbacks
Understanding feedbacks between the Greenland Ice Sheet (GrIS) and the Atlantic Meridional Overturning Circulation (AMOC) is crucial for reducing uncertainties over future sea level and ocean circulation change. Reconstructing past GrIS dynamics can extend the observational record and elucidate mech...
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ftpubmed:oai:pubmedcentral.nih.gov:6085367 2023-05-15T16:27:01+02:00 Greenland ice mass loss during the Younger Dryas driven by Atlantic Meridional Overturning Circulation feedbacks Rainsley, Eleanor Menviel, Laurie Fogwill, Christopher J. Turney, Chris S. M. Hughes, Anna L. C. Rood, Dylan H. 2018-08-09 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6085367/ http://www.ncbi.nlm.nih.gov/pubmed/30093676 https://doi.org/10.1038/s41598-018-29226-8 en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6085367/ http://www.ncbi.nlm.nih.gov/pubmed/30093676 http://dx.doi.org/10.1038/s41598-018-29226-8 © The Author(s) 2018 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/. CC-BY Article Text 2018 ftpubmed https://doi.org/10.1038/s41598-018-29226-8 2018-08-19T00:19:45Z Understanding feedbacks between the Greenland Ice Sheet (GrIS) and the Atlantic Meridional Overturning Circulation (AMOC) is crucial for reducing uncertainties over future sea level and ocean circulation change. Reconstructing past GrIS dynamics can extend the observational record and elucidate mechanisms that operate on multi-decadal timescales. We report a highly-constrained last glacial vertical profile of cosmogenic isotope exposure ages from Sermilik Fjord, a marine-terminating ice stream in the southeast sector of the GrIS. Our reconstruction reveals substantial ice-mass loss throughout the Younger Dryas (12.9-11.7 ka), a period of marked atmospheric and sea-surface cooling. Earth-system modelling reveals that southern GrIS marginal melt was likely driven by strengthening of the Irminger Current at depth due to a weakening of the AMOC during the Younger Dryas. This change in North Atlantic circulation appears to have drawn warm subsurface waters to southeast Greenland despite markedly cooler sea surface temperatures, enhancing thermal erosion at the grounding lines of palaeo ice-streams, supporting interpretation of regional marine-sediment cores. Given current rates of GrIS meltwater input into the North Atlantic and the vulnerability of major ice streams to water temperature changes at the grounding line, this mechanism has important implications for future AMOC changes and northern hemisphere heat transport. Text Greenland Ice Sheet North Atlantic Sermilik PubMed Central (PMC) Greenland Scientific Reports 8 1 |
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Article Rainsley, Eleanor Menviel, Laurie Fogwill, Christopher J. Turney, Chris S. M. Hughes, Anna L. C. Rood, Dylan H. Greenland ice mass loss during the Younger Dryas driven by Atlantic Meridional Overturning Circulation feedbacks |
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Understanding feedbacks between the Greenland Ice Sheet (GrIS) and the Atlantic Meridional Overturning Circulation (AMOC) is crucial for reducing uncertainties over future sea level and ocean circulation change. Reconstructing past GrIS dynamics can extend the observational record and elucidate mechanisms that operate on multi-decadal timescales. We report a highly-constrained last glacial vertical profile of cosmogenic isotope exposure ages from Sermilik Fjord, a marine-terminating ice stream in the southeast sector of the GrIS. Our reconstruction reveals substantial ice-mass loss throughout the Younger Dryas (12.9-11.7 ka), a period of marked atmospheric and sea-surface cooling. Earth-system modelling reveals that southern GrIS marginal melt was likely driven by strengthening of the Irminger Current at depth due to a weakening of the AMOC during the Younger Dryas. This change in North Atlantic circulation appears to have drawn warm subsurface waters to southeast Greenland despite markedly cooler sea surface temperatures, enhancing thermal erosion at the grounding lines of palaeo ice-streams, supporting interpretation of regional marine-sediment cores. Given current rates of GrIS meltwater input into the North Atlantic and the vulnerability of major ice streams to water temperature changes at the grounding line, this mechanism has important implications for future AMOC changes and northern hemisphere heat transport. |
format |
Text |
author |
Rainsley, Eleanor Menviel, Laurie Fogwill, Christopher J. Turney, Chris S. M. Hughes, Anna L. C. Rood, Dylan H. |
author_facet |
Rainsley, Eleanor Menviel, Laurie Fogwill, Christopher J. Turney, Chris S. M. Hughes, Anna L. C. Rood, Dylan H. |
author_sort |
Rainsley, Eleanor |
title |
Greenland ice mass loss during the Younger Dryas driven by Atlantic Meridional Overturning Circulation feedbacks |
title_short |
Greenland ice mass loss during the Younger Dryas driven by Atlantic Meridional Overturning Circulation feedbacks |
title_full |
Greenland ice mass loss during the Younger Dryas driven by Atlantic Meridional Overturning Circulation feedbacks |
title_fullStr |
Greenland ice mass loss during the Younger Dryas driven by Atlantic Meridional Overturning Circulation feedbacks |
title_full_unstemmed |
Greenland ice mass loss during the Younger Dryas driven by Atlantic Meridional Overturning Circulation feedbacks |
title_sort |
greenland ice mass loss during the younger dryas driven by atlantic meridional overturning circulation feedbacks |
publisher |
Nature Publishing Group UK |
publishDate |
2018 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6085367/ http://www.ncbi.nlm.nih.gov/pubmed/30093676 https://doi.org/10.1038/s41598-018-29226-8 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet North Atlantic Sermilik |
genre_facet |
Greenland Ice Sheet North Atlantic Sermilik |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6085367/ http://www.ncbi.nlm.nih.gov/pubmed/30093676 http://dx.doi.org/10.1038/s41598-018-29226-8 |
op_rights |
© The Author(s) 2018 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/. |
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CC-BY |
op_doi |
https://doi.org/10.1038/s41598-018-29226-8 |
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