Rapidly receding Arctic Canada glaciers revealing landscapes continuously ice-covered for more than 40,000 years
Arctic temperatures are increasing faster than the Northern Hemisphere average due to strong positive feedbacks unique to polar regions. However, the degree to which recent Arctic warming is unprecedented remains debated. Ages of entombed plants in growth position preserved by now receding ice caps...
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ftpubmed:oai:pubmedcentral.nih.gov:6347664 2023-05-15T14:37:41+02:00 Rapidly receding Arctic Canada glaciers revealing landscapes continuously ice-covered for more than 40,000 years Pendleton, Simon L. Miller, Gifford H. Lifton, Nathaniel Lehman, Scott J. Southon, John Crump, Sarah E. Anderson, Robert S. 2019-01-25 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6347664/ http://www.ncbi.nlm.nih.gov/pubmed/30683866 https://doi.org/10.1038/s41467-019-08307-w en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6347664/ http://www.ncbi.nlm.nih.gov/pubmed/30683866 http://dx.doi.org/10.1038/s41467-019-08307-w © The Author(s) 2019 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 2019 ftpubmed https://doi.org/10.1038/s41467-019-08307-w 2019-02-03T01:37:52Z Arctic temperatures are increasing faster than the Northern Hemisphere average due to strong positive feedbacks unique to polar regions. However, the degree to which recent Arctic warming is unprecedented remains debated. Ages of entombed plants in growth position preserved by now receding ice caps in Arctic Canada help to address this issue by placing recent conditions in a multi-millennial context. Here we show that pre-Holocene radiocarbon dates on plants collected at the margins of 30 ice caps in Arctic Canada suggest those locations were continuously ice covered for > 40 kyr, but are now ice-free. We use in situ 14C inventories in rocks from nine locations to explore the possibility of brief exposure during the warm early Holocene. Modeling the evolution of in situ 14C confirms that Holocene exposure is unlikely at all but one of the sites. Viewed in the context of temperature records from Greenland ice cores, our results suggest that summer warmth of the past century exceeds now any century in ~115,000 years. Text Arctic glacier* Greenland Greenland ice cores PubMed Central (PMC) Arctic Canada Greenland Nature Communications 10 1 |
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Article Pendleton, Simon L. Miller, Gifford H. Lifton, Nathaniel Lehman, Scott J. Southon, John Crump, Sarah E. Anderson, Robert S. Rapidly receding Arctic Canada glaciers revealing landscapes continuously ice-covered for more than 40,000 years |
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Article |
description |
Arctic temperatures are increasing faster than the Northern Hemisphere average due to strong positive feedbacks unique to polar regions. However, the degree to which recent Arctic warming is unprecedented remains debated. Ages of entombed plants in growth position preserved by now receding ice caps in Arctic Canada help to address this issue by placing recent conditions in a multi-millennial context. Here we show that pre-Holocene radiocarbon dates on plants collected at the margins of 30 ice caps in Arctic Canada suggest those locations were continuously ice covered for > 40 kyr, but are now ice-free. We use in situ 14C inventories in rocks from nine locations to explore the possibility of brief exposure during the warm early Holocene. Modeling the evolution of in situ 14C confirms that Holocene exposure is unlikely at all but one of the sites. Viewed in the context of temperature records from Greenland ice cores, our results suggest that summer warmth of the past century exceeds now any century in ~115,000 years. |
format |
Text |
author |
Pendleton, Simon L. Miller, Gifford H. Lifton, Nathaniel Lehman, Scott J. Southon, John Crump, Sarah E. Anderson, Robert S. |
author_facet |
Pendleton, Simon L. Miller, Gifford H. Lifton, Nathaniel Lehman, Scott J. Southon, John Crump, Sarah E. Anderson, Robert S. |
author_sort |
Pendleton, Simon L. |
title |
Rapidly receding Arctic Canada glaciers revealing landscapes continuously ice-covered for more than 40,000 years |
title_short |
Rapidly receding Arctic Canada glaciers revealing landscapes continuously ice-covered for more than 40,000 years |
title_full |
Rapidly receding Arctic Canada glaciers revealing landscapes continuously ice-covered for more than 40,000 years |
title_fullStr |
Rapidly receding Arctic Canada glaciers revealing landscapes continuously ice-covered for more than 40,000 years |
title_full_unstemmed |
Rapidly receding Arctic Canada glaciers revealing landscapes continuously ice-covered for more than 40,000 years |
title_sort |
rapidly receding arctic canada glaciers revealing landscapes continuously ice-covered for more than 40,000 years |
publisher |
Nature Publishing Group UK |
publishDate |
2019 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6347664/ http://www.ncbi.nlm.nih.gov/pubmed/30683866 https://doi.org/10.1038/s41467-019-08307-w |
geographic |
Arctic Canada Greenland |
geographic_facet |
Arctic Canada Greenland |
genre |
Arctic glacier* Greenland Greenland ice cores |
genre_facet |
Arctic glacier* Greenland Greenland ice cores |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6347664/ http://www.ncbi.nlm.nih.gov/pubmed/30683866 http://dx.doi.org/10.1038/s41467-019-08307-w |
op_rights |
© The Author(s) 2019 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/. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/s41467-019-08307-w |
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Nature Communications |
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10 |
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1 |
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1766309894189744128 |