Evidence for ephemeral middle Eocene to early Oligocene Greenland glacial ice and pan-Arctic sea ice
Earth’s modern climate is defined by the presence of ice at both poles, but that ice is now disappearing. Therefore understanding the origin and causes of polar ice stability is more critical than ever. Here we provide novel geochemical data that constrain past dynamics of glacial ice on Greenland a...
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ftpubmed:oai:pubmedcentral.nih.gov:5847593 2023-05-15T14:49:37+02:00 Evidence for ephemeral middle Eocene to early Oligocene Greenland glacial ice and pan-Arctic sea ice Tripati, Aradhna Darby, Dennis 2018-03-12 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5847593/ http://www.ncbi.nlm.nih.gov/pubmed/29531221 https://doi.org/10.1038/s41467-018-03180-5 en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5847593/ http://www.ncbi.nlm.nih.gov/pubmed/29531221 http://dx.doi.org/10.1038/s41467-018-03180-5 © 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/s41467-018-03180-5 2018-03-18T01:20:43Z Earth’s modern climate is defined by the presence of ice at both poles, but that ice is now disappearing. Therefore understanding the origin and causes of polar ice stability is more critical than ever. Here we provide novel geochemical data that constrain past dynamics of glacial ice on Greenland and Arctic sea ice. Based on accurate source determinations of individual ice-rafted Fe-oxide grains, we find evidence for episodic glaciation of distinct source regions on Greenland as far-ranging as ~68°N and ~80°N synchronous with ice-rafting from circum-Arctic sources, beginning in the middle Eocene. Glacial intervals broadly coincide with reduced CO2, with a potential threshold for glacial ice stability near ~500 p.p.m.v. The middle Eocene represents the Cenozoic onset of a dynamic cryosphere, with ice in both hemispheres during transient glacials and substantial regional climate heterogeneity. A more stable cryosphere developed at the Eocene-Oligocene transition, and is now threatened by anthropogenic emissions. Text Arctic Greenland Sea ice PubMed Central (PMC) Arctic Greenland Nature Communications 9 1 |
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Article Tripati, Aradhna Darby, Dennis Evidence for ephemeral middle Eocene to early Oligocene Greenland glacial ice and pan-Arctic sea ice |
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Article |
description |
Earth’s modern climate is defined by the presence of ice at both poles, but that ice is now disappearing. Therefore understanding the origin and causes of polar ice stability is more critical than ever. Here we provide novel geochemical data that constrain past dynamics of glacial ice on Greenland and Arctic sea ice. Based on accurate source determinations of individual ice-rafted Fe-oxide grains, we find evidence for episodic glaciation of distinct source regions on Greenland as far-ranging as ~68°N and ~80°N synchronous with ice-rafting from circum-Arctic sources, beginning in the middle Eocene. Glacial intervals broadly coincide with reduced CO2, with a potential threshold for glacial ice stability near ~500 p.p.m.v. The middle Eocene represents the Cenozoic onset of a dynamic cryosphere, with ice in both hemispheres during transient glacials and substantial regional climate heterogeneity. A more stable cryosphere developed at the Eocene-Oligocene transition, and is now threatened by anthropogenic emissions. |
format |
Text |
author |
Tripati, Aradhna Darby, Dennis |
author_facet |
Tripati, Aradhna Darby, Dennis |
author_sort |
Tripati, Aradhna |
title |
Evidence for ephemeral middle Eocene to early Oligocene Greenland glacial ice and pan-Arctic sea ice |
title_short |
Evidence for ephemeral middle Eocene to early Oligocene Greenland glacial ice and pan-Arctic sea ice |
title_full |
Evidence for ephemeral middle Eocene to early Oligocene Greenland glacial ice and pan-Arctic sea ice |
title_fullStr |
Evidence for ephemeral middle Eocene to early Oligocene Greenland glacial ice and pan-Arctic sea ice |
title_full_unstemmed |
Evidence for ephemeral middle Eocene to early Oligocene Greenland glacial ice and pan-Arctic sea ice |
title_sort |
evidence for ephemeral middle eocene to early oligocene greenland glacial ice and pan-arctic sea ice |
publisher |
Nature Publishing Group UK |
publishDate |
2018 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5847593/ http://www.ncbi.nlm.nih.gov/pubmed/29531221 https://doi.org/10.1038/s41467-018-03180-5 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Sea ice |
genre_facet |
Arctic Greenland Sea ice |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5847593/ http://www.ncbi.nlm.nih.gov/pubmed/29531221 http://dx.doi.org/10.1038/s41467-018-03180-5 |
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/s41467-018-03180-5 |
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Nature Communications |
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9 |
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1 |
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1766320699887058944 |