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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ftciteseerx:oai:CiteSeerX.psu:10.1.1.362.4873 2023-05-15T16:41:44+02:00 A new mechanism for Dansgaard-Oeschger cycles The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.362.4873 http://www.leif.org/EOS/palo20005-D-O-Explanation.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.362.4873 http://www.leif.org/EOS/palo20005-D-O-Explanation.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.leif.org/EOS/palo20005-D-O-Explanation.pdf North Atlantic and Nordic Seas text ftciteseerx 2016-01-08T00:53:50Z [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 Text Ice Shelf Nordic Seas North Atlantic Sea ice Unknown |
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Open Polar |
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ftciteseerx |
language |
English |
topic |
North Atlantic and Nordic Seas |
spellingShingle |
North Atlantic and Nordic Seas A new mechanism for Dansgaard-Oeschger cycles |
topic_facet |
North Atlantic and Nordic Seas |
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 |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
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 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.362.4873 http://www.leif.org/EOS/palo20005-D-O-Explanation.pdf |
genre |
Ice Shelf Nordic Seas North Atlantic Sea ice |
genre_facet |
Ice Shelf Nordic Seas North Atlantic Sea ice |
op_source |
http://www.leif.org/EOS/palo20005-D-O-Explanation.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.362.4873 http://www.leif.org/EOS/palo20005-D-O-Explanation.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766032200608776192 |