A low climate threshold for south Greenland Ice Sheet demise during the Late Pleistocene
The Greenland Ice Sheet (GIS) has been losing mass at an accelerating rate over the recent decades. Models suggest a possible temperature threshold between 0.8 and 3.2 °C, beyond which GIS decline becomes irreversible. The duration of warmth above a given threshold is also a critical determinant for...
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ftpubmed:oai:pubmedcentral.nih.gov:6955352 2023-05-15T16:26:16+02:00 A low climate threshold for south Greenland Ice Sheet demise during the Late Pleistocene Irvalı, Nil Galaasen, Eirik V. Ninnemann, Ulysses S. Rosenthal, Yair Born, Andreas Kleiven, Helga (Kikki) F. 2020-01-07 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6955352/ http://www.ncbi.nlm.nih.gov/pubmed/31871153 https://doi.org/10.1073/pnas.1911902116 en eng National Academy of Sciences http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6955352/ http://www.ncbi.nlm.nih.gov/pubmed/31871153 http://dx.doi.org/10.1073/pnas.1911902116 Copyright © 2020 the Author(s). Published by PNAS. https://creativecommons.org/licenses/by-nc-nd/4.0/ https://creativecommons.org/licenses/by-nc-nd/4.0/This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) (https://creativecommons.org/licenses/by-nc-nd/4.0/) . CC-BY-NC-ND Physical Sciences Text 2020 ftpubmed https://doi.org/10.1073/pnas.1911902116 2020-01-19T01:28:39Z The Greenland Ice Sheet (GIS) has been losing mass at an accelerating rate over the recent decades. Models suggest a possible temperature threshold between 0.8 and 3.2 °C, beyond which GIS decline becomes irreversible. The duration of warmth above a given threshold is also a critical determinant for GIS survival, underlining the role of ocean warming, as its inertia prolongs warmth and triggers longer-term feedbacks. The exact point at which these feedbacks are triggered remains equivocal. Late Pleistocene interglacials provide potential case examples for constraining the past response of the GIS to a range of climate states, including conditions warmer than present. However, little is known about the magnitude and duration of warming near Greenland during these periods. Using high-resolution multiproxy surface ocean climate records off southern Greenland, we show that the previous 4 interglacials over the last ∼450 ka all reached warmer than present climate conditions and exceeded the modeled temperature threshold for GIS collapse but by different magnitudes and durations. Complete deglaciation of the southern GIS in Marine Isotope Stage 11c (MIS 11c; 394.7 to 424.2 ka) occurred under climates only slightly warmer than present (∼0.5 ± 1.6 °C), placing the temperature threshold for major GIS retreat in the lower end of model estimates and within projections for this century. Text Greenland Ice Sheet PubMed Central (PMC) Exact Point ENVELOPE(-132.407,-132.407,53.128,53.128) Greenland Proceedings of the National Academy of Sciences 117 1 190 195 |
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English |
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Physical Sciences |
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Physical Sciences Irvalı, Nil Galaasen, Eirik V. Ninnemann, Ulysses S. Rosenthal, Yair Born, Andreas Kleiven, Helga (Kikki) F. A low climate threshold for south Greenland Ice Sheet demise during the Late Pleistocene |
topic_facet |
Physical Sciences |
description |
The Greenland Ice Sheet (GIS) has been losing mass at an accelerating rate over the recent decades. Models suggest a possible temperature threshold between 0.8 and 3.2 °C, beyond which GIS decline becomes irreversible. The duration of warmth above a given threshold is also a critical determinant for GIS survival, underlining the role of ocean warming, as its inertia prolongs warmth and triggers longer-term feedbacks. The exact point at which these feedbacks are triggered remains equivocal. Late Pleistocene interglacials provide potential case examples for constraining the past response of the GIS to a range of climate states, including conditions warmer than present. However, little is known about the magnitude and duration of warming near Greenland during these periods. Using high-resolution multiproxy surface ocean climate records off southern Greenland, we show that the previous 4 interglacials over the last ∼450 ka all reached warmer than present climate conditions and exceeded the modeled temperature threshold for GIS collapse but by different magnitudes and durations. Complete deglaciation of the southern GIS in Marine Isotope Stage 11c (MIS 11c; 394.7 to 424.2 ka) occurred under climates only slightly warmer than present (∼0.5 ± 1.6 °C), placing the temperature threshold for major GIS retreat in the lower end of model estimates and within projections for this century. |
format |
Text |
author |
Irvalı, Nil Galaasen, Eirik V. Ninnemann, Ulysses S. Rosenthal, Yair Born, Andreas Kleiven, Helga (Kikki) F. |
author_facet |
Irvalı, Nil Galaasen, Eirik V. Ninnemann, Ulysses S. Rosenthal, Yair Born, Andreas Kleiven, Helga (Kikki) F. |
author_sort |
Irvalı, Nil |
title |
A low climate threshold for south Greenland Ice Sheet demise during the Late Pleistocene |
title_short |
A low climate threshold for south Greenland Ice Sheet demise during the Late Pleistocene |
title_full |
A low climate threshold for south Greenland Ice Sheet demise during the Late Pleistocene |
title_fullStr |
A low climate threshold for south Greenland Ice Sheet demise during the Late Pleistocene |
title_full_unstemmed |
A low climate threshold for south Greenland Ice Sheet demise during the Late Pleistocene |
title_sort |
low climate threshold for south greenland ice sheet demise during the late pleistocene |
publisher |
National Academy of Sciences |
publishDate |
2020 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6955352/ http://www.ncbi.nlm.nih.gov/pubmed/31871153 https://doi.org/10.1073/pnas.1911902116 |
long_lat |
ENVELOPE(-132.407,-132.407,53.128,53.128) |
geographic |
Exact Point Greenland |
geographic_facet |
Exact Point Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6955352/ http://www.ncbi.nlm.nih.gov/pubmed/31871153 http://dx.doi.org/10.1073/pnas.1911902116 |
op_rights |
Copyright © 2020 the Author(s). Published by PNAS. https://creativecommons.org/licenses/by-nc-nd/4.0/ https://creativecommons.org/licenses/by-nc-nd/4.0/This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) (https://creativecommons.org/licenses/by-nc-nd/4.0/) . |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1073/pnas.1911902116 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
117 |
container_issue |
1 |
container_start_page |
190 |
op_container_end_page |
195 |
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1766015177558327296 |