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 cal years ago (23 to 19 ka), no D-O events are obser...
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ftsouthampton:oai:eprints.soton.ac.uk:476637 2023-07-30T04:03:48+02:00 Obliquity-driven expansion of North Atlantic sea ice during the last glacial Turney, Chris S.M. Thomas, Zoë A. Hutchinson, David K. Bradshaw, Corey J.A. Brook, Barry W. England, Matthew H. Fogwill, Christopher J. Jones, Richard T. Palmer, Jonathan Hughen, Konrad A. Cooper, Alan 2015-12-16 https://eprints.soton.ac.uk/476637/ English eng Turney, Chris S.M., Thomas, Zoë A. and Hutchinson, David K. , et al. (2015) Obliquity-driven expansion of North Atlantic sea ice during the last glacial. Geophysical Research Letters, 42 (23), 10382-10390. (doi:10.1002/2015GL066344 <http://dx.doi.org/10.1002/2015GL066344>). Article PeerReviewed 2015 ftsouthampton https://doi.org/10.1002/2015GL066344 2023-07-09T22:59:37Z 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 cal 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 modeling suggests that 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 that these feedbacks tipped the climate system into full glacial conditions, leading to maximum continental ice growth during the LGM. Article in Journal/Newspaper Greenland Greenland ice cores Labrador Sea North Atlantic Sea ice University of Southampton: e-Prints Soton Greenland Geophysical Research Letters 42 23 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
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 cal 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 modeling suggests that 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 that these feedbacks tipped the climate system into full glacial conditions, leading to maximum continental ice growth during the LGM. |
format |
Article in Journal/Newspaper |
author |
Turney, Chris S.M. Thomas, Zoë A. Hutchinson, David K. Bradshaw, Corey J.A. Brook, Barry W. England, Matthew H. Fogwill, Christopher J. Jones, Richard T. Palmer, Jonathan Hughen, Konrad A. Cooper, Alan |
spellingShingle |
Turney, Chris S.M. Thomas, Zoë A. Hutchinson, David K. Bradshaw, Corey J.A. Brook, Barry W. England, Matthew H. Fogwill, Christopher J. Jones, Richard T. Palmer, Jonathan Hughen, Konrad A. Cooper, Alan Obliquity-driven expansion of North Atlantic sea ice during the last glacial |
author_facet |
Turney, Chris S.M. Thomas, Zoë A. Hutchinson, David K. Bradshaw, Corey J.A. Brook, Barry W. England, Matthew H. Fogwill, Christopher J. Jones, Richard T. Palmer, Jonathan Hughen, Konrad A. Cooper, Alan |
author_sort |
Turney, Chris S.M. |
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 |
publishDate |
2015 |
url |
https://eprints.soton.ac.uk/476637/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice cores Labrador Sea North Atlantic Sea ice |
genre_facet |
Greenland Greenland ice cores Labrador Sea North Atlantic Sea ice |
op_relation |
Turney, Chris S.M., Thomas, Zoë A. and Hutchinson, David K. , et al. (2015) Obliquity-driven expansion of North Atlantic sea ice during the last glacial. Geophysical Research Letters, 42 (23), 10382-10390. (doi:10.1002/2015GL066344 <http://dx.doi.org/10.1002/2015GL066344>). |
op_doi |
https://doi.org/10.1002/2015GL066344 |
container_title |
Geophysical Research Letters |
container_volume |
42 |
container_issue |
23 |
_version_ |
1772814892596723712 |