A New Mechanism for Dansgaard-Oeschger Cycles
[1] We present a new hypothesis to explain the millennial-scale temperature variability recorded in ice cores known as Dansgaard-Oeschger (DO) cycles. We propose that an ice shelf acted in concert with sea ice to set the slow and fast timescales of the DO cycle, respectively. The abrupt warming at t...
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Language: | English |
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Online Access: | http://nrs.harvard.edu/urn-3:HUL.InstRepos:14117051 https://doi.org/10.1029/2012PA002364 |
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ftharvardudash:oai:dash.harvard.edu:1/14117051 2023-05-15T16:41:45+02:00 A New Mechanism for Dansgaard-Oeschger Cycles Petersen, Sierra Victoria Schrag, Daniel P. Clark, P. U. 2013 application/pdf application/msword http://nrs.harvard.edu/urn-3:HUL.InstRepos:14117051 https://doi.org/10.1029/2012PA002364 en_US eng Wiley-Blackwell doi:10.1029/2012PA002364 Paleoceanography Quick submit: 2015-01-16T18:15:17-05:00 Petersen, Sierra Victoria, Daniel P. Schrag, and P. U. Clark. 2013. “A New Mechanism for Dansgaard-Oeschger Cycles.” Paleoceanography 28 (1): 24–30. 0883-8305 http://nrs.harvard.edu/urn-3:HUL.InstRepos:14117051 Sierra V. Petersen, Daniel P. Schrag, and Peter U. Clark Dansgaard-Oeschger cycles Journal Article 2013 ftharvardudash https://doi.org/10.1029/2012PA002364 2022-04-05T06:46:42Z [1] We present a new hypothesis to explain the millennial-scale temperature variability recorded in ice cores known as Dansgaard-Oeschger (DO) cycles. We propose that an ice shelf acted in concert with sea ice to set the slow and fast timescales of the DO cycle, respectively. The abrupt warming at the onset of a cycle is caused by the rapid retreat of sea ice after the collapse of an ice shelf. The gradual cooling during the subsequent interstadial phase is determined by the timescale of ice-shelf regrowth. Once the ice shelf reaches a critical size, sea ice expands, driving the climate rapidly back into stadial conditions. The stadial phase ends when warm subsurface waters penetrate beneath the ice shelf and cause it to collapse. This hypothesis explains the full shape of the DO cycle, the duration of the different phases, and the transitions between them and is supported by proxy records in the North Atlantic and Nordic Seas. Engineering and Applied Sciences Accepted Manuscript Article in Journal/Newspaper Ice Shelf Nordic Seas North Atlantic Sea ice Harvard University: DASH - Digital Access to Scholarship at Harvard Paleoceanography 28 1 24 30 |
institution |
Open Polar |
collection |
Harvard University: DASH - Digital Access to Scholarship at Harvard |
op_collection_id |
ftharvardudash |
language |
English |
topic |
Dansgaard-Oeschger cycles |
spellingShingle |
Dansgaard-Oeschger cycles Petersen, Sierra Victoria Schrag, Daniel P. Clark, P. U. A New Mechanism for Dansgaard-Oeschger Cycles |
topic_facet |
Dansgaard-Oeschger cycles |
description |
[1] We present a new hypothesis to explain the millennial-scale temperature variability recorded in ice cores known as Dansgaard-Oeschger (DO) cycles. We propose that an ice shelf acted in concert with sea ice to set the slow and fast timescales of the DO cycle, respectively. The abrupt warming at the onset of a cycle is caused by the rapid retreat of sea ice after the collapse of an ice shelf. The gradual cooling during the subsequent interstadial phase is determined by the timescale of ice-shelf regrowth. Once the ice shelf reaches a critical size, sea ice expands, driving the climate rapidly back into stadial conditions. The stadial phase ends when warm subsurface waters penetrate beneath the ice shelf and cause it to collapse. This hypothesis explains the full shape of the DO cycle, the duration of the different phases, and the transitions between them and is supported by proxy records in the North Atlantic and Nordic Seas. Engineering and Applied Sciences Accepted Manuscript |
format |
Article in Journal/Newspaper |
author |
Petersen, Sierra Victoria Schrag, Daniel P. Clark, P. U. |
author_facet |
Petersen, Sierra Victoria Schrag, Daniel P. Clark, P. U. |
author_sort |
Petersen, Sierra Victoria |
title |
A New Mechanism for Dansgaard-Oeschger Cycles |
title_short |
A New Mechanism for Dansgaard-Oeschger Cycles |
title_full |
A New Mechanism for Dansgaard-Oeschger Cycles |
title_fullStr |
A New Mechanism for Dansgaard-Oeschger Cycles |
title_full_unstemmed |
A New Mechanism for Dansgaard-Oeschger Cycles |
title_sort |
new mechanism for dansgaard-oeschger cycles |
publisher |
Wiley-Blackwell |
publishDate |
2013 |
url |
http://nrs.harvard.edu/urn-3:HUL.InstRepos:14117051 https://doi.org/10.1029/2012PA002364 |
genre |
Ice Shelf Nordic Seas North Atlantic Sea ice |
genre_facet |
Ice Shelf Nordic Seas North Atlantic Sea ice |
op_relation |
doi:10.1029/2012PA002364 Paleoceanography Quick submit: 2015-01-16T18:15:17-05:00 Petersen, Sierra Victoria, Daniel P. Schrag, and P. U. Clark. 2013. “A New Mechanism for Dansgaard-Oeschger Cycles.” Paleoceanography 28 (1): 24–30. 0883-8305 http://nrs.harvard.edu/urn-3:HUL.InstRepos:14117051 |
op_rights |
Sierra V. Petersen, Daniel P. Schrag, and Peter U. Clark |
op_doi |
https://doi.org/10.1029/2012PA002364 |
container_title |
Paleoceanography |
container_volume |
28 |
container_issue |
1 |
container_start_page |
24 |
op_container_end_page |
30 |
_version_ |
1766032211141722112 |