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 Greenl...
Published in: | Nature Communications |
---|---|
Main Authors: | , |
Format: | Text |
Language: | English |
Published: |
Nature Publishing Group
|
Subjects: | |
Online Access: | https://doi.org/10.1038/s41467-018-03180-5 https://archimer.ifremer.fr/doc/00434/54587/55976.pdf https://archimer.ifremer.fr/doc/00434/54587/55977.pdf https://archimer.ifremer.fr/doc/00434/54587/55978.pdf https://archimer.ifremer.fr/doc/00434/54587/55979.xlsx |
id |
fttriple:oai:gotriple.eu:10670/1.gwf4q2 |
---|---|
record_format |
openpolar |
spelling |
fttriple:oai:gotriple.eu:10670/1.gwf4q2 2023-05-15T14:50:55+02:00 Evidence for ephemeral middle Eocene to early Oligocene Greenland glacial ice and pan-Arctic sea ice Tripati, Aradhna Darby, Dennis https://doi.org/10.1038/s41467-018-03180-5 https://archimer.ifremer.fr/doc/00434/54587/55976.pdf https://archimer.ifremer.fr/doc/00434/54587/55977.pdf https://archimer.ifremer.fr/doc/00434/54587/55978.pdf https://archimer.ifremer.fr/doc/00434/54587/55979.xlsx en eng Nature Publishing Group doi:10.1038/s41467-018-03180-5 10670/1.gwf4q2 https://archimer.ifremer.fr/doc/00434/54587/55976.pdf https://archimer.ifremer.fr/doc/00434/54587/55977.pdf https://archimer.ifremer.fr/doc/00434/54587/55978.pdf https://archimer.ifremer.fr/doc/00434/54587/55979.xlsx other Archimer, archive institutionnelle de l'Ifremer Nature Communications (2041-1723) (Nature Publishing Group), 2018-03 , Vol. 9 , N. 1038 , P. 11p.- geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1038/s41467-018-03180-5 2023-01-22T16:46:27Z 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 similar to 68 degrees N and similar to 80 degrees 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 similar to 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 Unknown Arctic Greenland Nature Communications 9 1 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir Tripati, Aradhna Darby, Dennis Evidence for ephemeral middle Eocene to early Oligocene Greenland glacial ice and pan-Arctic sea ice |
topic_facet |
geo envir |
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 similar to 68 degrees N and similar to 80 degrees 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 similar to 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 |
url |
https://doi.org/10.1038/s41467-018-03180-5 https://archimer.ifremer.fr/doc/00434/54587/55976.pdf https://archimer.ifremer.fr/doc/00434/54587/55977.pdf https://archimer.ifremer.fr/doc/00434/54587/55978.pdf https://archimer.ifremer.fr/doc/00434/54587/55979.xlsx |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Sea ice |
genre_facet |
Arctic Greenland Sea ice |
op_source |
Archimer, archive institutionnelle de l'Ifremer Nature Communications (2041-1723) (Nature Publishing Group), 2018-03 , Vol. 9 , N. 1038 , P. 11p.- |
op_relation |
doi:10.1038/s41467-018-03180-5 10670/1.gwf4q2 https://archimer.ifremer.fr/doc/00434/54587/55976.pdf https://archimer.ifremer.fr/doc/00434/54587/55977.pdf https://archimer.ifremer.fr/doc/00434/54587/55978.pdf https://archimer.ifremer.fr/doc/00434/54587/55979.xlsx |
op_rights |
other |
op_doi |
https://doi.org/10.1038/s41467-018-03180-5 |
container_title |
Nature Communications |
container_volume |
9 |
container_issue |
1 |
_version_ |
1766321970927894528 |