Obliquity-driven expansion of North Atlantic sea ice during the last glacial
North Atlantic late-Pleistocene climate (60,000 to 11,650 years ago) was characterized by abrupt and extreme millennial-duration oscillations known as Dansgaard-Oeschger (D-O) events. However, during the Last Glacial Maximum (LGM) 23,000 to 19,000 calendar years ago (23 to 19 ka), no D-O events are...
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Online Access: | http://hdl.handle.net/2440/101295 https://doi.org/10.1002/2015GL066344 |
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ftunivadelaidedl:oai:digital.library.adelaide.edu.au:2440/101295 2023-12-24T10:17:06+01:00 Obliquity-driven expansion of North Atlantic sea ice during the last glacial Turney, C. Thomas, Z. Hutchinson, D. Bradshaw, C. Brook, B. England, M. Fogwill, C. Jones, R. Palmer, J. Hughen, K. Cooper, A. 2015 http://hdl.handle.net/2440/101295 https://doi.org/10.1002/2015GL066344 en eng American Geophysical Union (AGU) ARC Geophysical Research Letters, 2015; 42(23):10382-10390 0094-8276 1944-8007 http://hdl.handle.net/2440/101295 doi:10.1002/2015GL066344 Bradshaw, C. [0000-0002-5328-7741] Cooper, A. [0000-0002-7738-7851] © 2015 American Geophysical Union. All Rights Reserved. http://dx.doi.org/10.1002/2015gl066344 Late Pleistocene abrupt climate change geochronology tipping point meridional overturning circulation Greenland ice cores Journal article 2015 ftunivadelaidedl https://doi.org/10.1002/2015GL06634410.1002/2015gl066344 2023-11-27T23:22:55Z North Atlantic late-Pleistocene climate (60,000 to 11,650 years ago) was characterized by abrupt and extreme millennial-duration oscillations known as Dansgaard-Oeschger (D-O) events. However, during the Last Glacial Maximum (LGM) 23,000 to 19,000 calendar years ago (23 to 19 ka), no D-O events are observed in the Greenland ice cores. Our new analysis of the Greenland δ¹⁸O record reveals a switch in the stability of the climate system around 30 ka, suggesting that a critical threshold was passed. Climate-system modelling suggests low axial obliquity at this time caused vastly expanded sea ice in the Labrador Sea, shifting Northern Hemisphere westerly winds south and reducing the strength of Meridional Overturning Circulation. The results suggest these feedbacks tipped the climate system into full glacial conditions, leading to maximum continental ice growth during the LGM. Chris S. M. Turney, Zoë A. Thomas, David K. Hutchinson, Corey J.A. Bradshaw, Barry W. Brook, Matthew H. England, Christopher J. Fogwill, Richard T. Jones, Jonathan Palmer, Konrad A. Hughen, and Alan Cooper Article in Journal/Newspaper Greenland Greenland ice cores Labrador Sea North Atlantic Sea ice The University of Adelaide: Digital Library Greenland Bradshaw ENVELOPE(163.867,163.867,-71.467,-71.467) Corey ENVELOPE(-145.133,-145.133,-76.667,-76.667) Geophysical Research Letters 42 23 |
institution |
Open Polar |
collection |
The University of Adelaide: Digital Library |
op_collection_id |
ftunivadelaidedl |
language |
English |
topic |
Late Pleistocene abrupt climate change geochronology tipping point meridional overturning circulation Greenland ice cores |
spellingShingle |
Late Pleistocene abrupt climate change geochronology tipping point meridional overturning circulation Greenland ice cores Turney, C. Thomas, Z. Hutchinson, D. Bradshaw, C. Brook, B. England, M. Fogwill, C. Jones, R. Palmer, J. Hughen, K. Cooper, A. Obliquity-driven expansion of North Atlantic sea ice during the last glacial |
topic_facet |
Late Pleistocene abrupt climate change geochronology tipping point meridional overturning circulation Greenland ice cores |
description |
North Atlantic late-Pleistocene climate (60,000 to 11,650 years ago) was characterized by abrupt and extreme millennial-duration oscillations known as Dansgaard-Oeschger (D-O) events. However, during the Last Glacial Maximum (LGM) 23,000 to 19,000 calendar years ago (23 to 19 ka), no D-O events are observed in the Greenland ice cores. Our new analysis of the Greenland δ¹⁸O record reveals a switch in the stability of the climate system around 30 ka, suggesting that a critical threshold was passed. Climate-system modelling suggests low axial obliquity at this time caused vastly expanded sea ice in the Labrador Sea, shifting Northern Hemisphere westerly winds south and reducing the strength of Meridional Overturning Circulation. The results suggest these feedbacks tipped the climate system into full glacial conditions, leading to maximum continental ice growth during the LGM. Chris S. M. Turney, Zoë A. Thomas, David K. Hutchinson, Corey J.A. Bradshaw, Barry W. Brook, Matthew H. England, Christopher J. Fogwill, Richard T. Jones, Jonathan Palmer, Konrad A. Hughen, and Alan Cooper |
format |
Article in Journal/Newspaper |
author |
Turney, C. Thomas, Z. Hutchinson, D. Bradshaw, C. Brook, B. England, M. Fogwill, C. Jones, R. Palmer, J. Hughen, K. Cooper, A. |
author_facet |
Turney, C. Thomas, Z. Hutchinson, D. Bradshaw, C. Brook, B. England, M. Fogwill, C. Jones, R. Palmer, J. Hughen, K. Cooper, A. |
author_sort |
Turney, C. |
title |
Obliquity-driven expansion of North Atlantic sea ice during the last glacial |
title_short |
Obliquity-driven expansion of North Atlantic sea ice during the last glacial |
title_full |
Obliquity-driven expansion of North Atlantic sea ice during the last glacial |
title_fullStr |
Obliquity-driven expansion of North Atlantic sea ice during the last glacial |
title_full_unstemmed |
Obliquity-driven expansion of North Atlantic sea ice during the last glacial |
title_sort |
obliquity-driven expansion of north atlantic sea ice during the last glacial |
publisher |
American Geophysical Union (AGU) |
publishDate |
2015 |
url |
http://hdl.handle.net/2440/101295 https://doi.org/10.1002/2015GL066344 |
long_lat |
ENVELOPE(163.867,163.867,-71.467,-71.467) ENVELOPE(-145.133,-145.133,-76.667,-76.667) |
geographic |
Greenland Bradshaw Corey |
geographic_facet |
Greenland Bradshaw Corey |
genre |
Greenland Greenland ice cores Labrador Sea North Atlantic Sea ice |
genre_facet |
Greenland Greenland ice cores Labrador Sea North Atlantic Sea ice |
op_source |
http://dx.doi.org/10.1002/2015gl066344 |
op_relation |
ARC Geophysical Research Letters, 2015; 42(23):10382-10390 0094-8276 1944-8007 http://hdl.handle.net/2440/101295 doi:10.1002/2015GL066344 Bradshaw, C. [0000-0002-5328-7741] Cooper, A. [0000-0002-7738-7851] |
op_rights |
© 2015 American Geophysical Union. All Rights Reserved. |
op_doi |
https://doi.org/10.1002/2015GL06634410.1002/2015gl066344 |
container_title |
Geophysical Research Letters |
container_volume |
42 |
container_issue |
23 |
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1786204987672494080 |