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...

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Published in:Nature Communications
Main Authors: Tripati, Aradhna, Darby, Dennis
Format: Article in Journal/Newspaper
Language:unknown
Published: ODU Digital Commons 2018
Subjects:
Bipolar glaciation
Circulation
Calcite compensation
Rafted debris
Sediment sources
Geochemistry
Geology
Glaciology
Paleontology
Arctic
Greenland
Sea ice
Online Access:https://digitalcommons.odu.edu/oeas_fac_pubs/255
https://doi.org/10.1038/s41467-018-03180-5
https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1266/viewcontent/Tripati_2018_Evidence_for_ephemeral_middle_Eo1.pdf
id ftolddominionuni:oai:digitalcommons.odu.edu:oeas_fac_pubs-1266
record_format openpolar
spelling ftolddominionuni:oai:digitalcommons.odu.edu:oeas_fac_pubs-1266 2023-12-03T10:16:41+01:00 Evidence for Ephemeral Middle Eocene to Early Oligocene Greenland Glacial Ice and Pan-Arctic Sea Ice Tripati, Aradhna Darby, Dennis 2018-01-01T08:00:00Z application/pdf https://digitalcommons.odu.edu/oeas_fac_pubs/255 https://doi.org/10.1038/s41467-018-03180-5 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1266/viewcontent/Tripati_2018_Evidence_for_ephemeral_middle_Eo1.pdf unknown ODU Digital Commons https://digitalcommons.odu.edu/oeas_fac_pubs/255 doi:10.1038/s41467-018-03180-5 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1266/viewcontent/Tripati_2018_Evidence_for_ephemeral_middle_Eo1.pdf © The Author(s) 2018 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. OES Faculty Publications Bipolar glaciation Circulation Calcite compensation Rafted debris Sediment sources Geochemistry Geology Glaciology Paleontology article 2018 ftolddominionuni https://doi.org/10.1038/s41467-018-03180-5 2023-11-06T19:09:42Z 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. Article in Journal/Newspaper Arctic Greenland Sea ice Old Dominion University: ODU Digital Commons Arctic Greenland Nature Communications 9 1
institution Open Polar
collection Old Dominion University: ODU Digital Commons
op_collection_id ftolddominionuni
language unknown
topic Bipolar glaciation
Circulation
Calcite compensation
Rafted debris
Sediment sources
Geochemistry
Geology
Glaciology
Paleontology
spellingShingle Bipolar glaciation
Circulation
Calcite compensation
Rafted debris
Sediment sources
Geochemistry
Geology
Glaciology
Paleontology
Tripati, Aradhna
Darby, Dennis
Evidence for Ephemeral Middle Eocene to Early Oligocene Greenland Glacial Ice and Pan-Arctic Sea Ice
topic_facet Bipolar glaciation
Circulation
Calcite compensation
Rafted debris
Sediment sources
Geochemistry
Geology
Glaciology
Paleontology
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 Article in Journal/Newspaper
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 ODU Digital Commons
publishDate 2018
url https://digitalcommons.odu.edu/oeas_fac_pubs/255
https://doi.org/10.1038/s41467-018-03180-5
https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1266/viewcontent/Tripati_2018_Evidence_for_ephemeral_middle_Eo1.pdf
geographic Arctic
Greenland
geographic_facet Arctic
Greenland
genre Arctic
Greenland
Sea ice
genre_facet Arctic
Greenland
Sea ice
op_source OES Faculty Publications
op_relation https://digitalcommons.odu.edu/oeas_fac_pubs/255
doi:10.1038/s41467-018-03180-5
https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1266/viewcontent/Tripati_2018_Evidence_for_ephemeral_middle_Eo1.pdf
op_rights © The Author(s) 2018 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.
op_doi https://doi.org/10.1038/s41467-018-03180-5
container_title Nature Communications
container_volume 9
container_issue 1
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