A “Triple Sea-Ice State” Mechanism for the Abrupt Warming and Synchronous Ice Sheet Collapses During Heinrich Events
Abrupt, switch-like, changes in sea ice cover are proposed as a mechanism for the large-amplitude abrupt warming that seemed to have occurred after each Heinrich event. Sea ice changes are also used to explain the colder-than-ambient glacial conditions around the time of the glacier discharge. The a...
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American Geophysical Union
2004
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Online Access: | http://nrs.harvard.edu/urn-3:HUL.InstRepos:3440625 https://doi.org/10.1029/2004PA001009 |
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ftharvardudash:oai:dash.harvard.edu:1/3440625 2023-05-15T16:00:05+02:00 A “Triple Sea-Ice State” Mechanism for the Abrupt Warming and Synchronous Ice Sheet Collapses During Heinrich Events Kaspi, Yohai Sayag, Roiy Tziperman, Eli 2004 application/pdf http://nrs.harvard.edu/urn-3:HUL.InstRepos:3440625 https://doi.org/10.1029/2004PA001009 en_US eng American Geophysical Union http://dx.doi.org/10.1029/2004PA001009 Paleoceanography Kaspi, Yohai, Roiy Sayag, and Eli Tziperman. 2004. A "triple sea-ice state" mechanism for the abrupt warming and synchronous ice sheet collapses during heinrich events. Paleoceanography, 19(PA3004): 1-12. 0883-8305 http://nrs.harvard.edu/urn-3:HUL.InstRepos:3440625 doi:10.1029/2004PA001009 Journal Article 2004 ftharvardudash https://doi.org/10.1029/2004PA001009 2022-04-04T12:36:29Z Abrupt, switch-like, changes in sea ice cover are proposed as a mechanism for the large-amplitude abrupt warming that seemed to have occurred after each Heinrich event. Sea ice changes are also used to explain the colder-than-ambient glacial conditions around the time of the glacier discharge. The abrupt warming events occur in this mechanism, owing to rapid sea ice melting which warmed the atmosphere via the strong sea ice albedo and insulating feedbacks. Such abrupt sea ice changes can also account for the warming observed during Dansgaard-Oeschger events. The sea ice changes are caused by a weak (order of 5 Sv) response of the thermohaline circulation (THC) to glacier discharges. The main point of this work is therefore that sea ice may be thought of as a very effective amplifier of a weak THC variability, explaining the abrupt temperature changes over Greenland. Synchronous ice sheet collapses from different ice sheets around the North Atlantic, indicated by some proxy records, are shown to be possible via the weak coupling between the different ice sheets by the atmospheric temperature changes caused by the sea ice changes. This weak coupling can lead to a “nonlinear phase locking” of the different ice sheets which therefore discharge synchronously. It is shown that the phase locking may also lead to “precursor” glacier discharge events from smaller ice sheets before the Laurentide Ice Sheet discharges. The precursor events in this mechanism are the result rather than the cause of the major glacier discharges from the Laurentide Ice Sheet. Earth and Planetary Sciences Version of Record Article in Journal/Newspaper Dansgaard-Oeschger events glacier Greenland Ice Sheet North Atlantic Sea ice Harvard University: DASH - Digital Access to Scholarship at Harvard Greenland Paleoceanography 19 3 n/a n/a |
institution |
Open Polar |
collection |
Harvard University: DASH - Digital Access to Scholarship at Harvard |
op_collection_id |
ftharvardudash |
language |
English |
description |
Abrupt, switch-like, changes in sea ice cover are proposed as a mechanism for the large-amplitude abrupt warming that seemed to have occurred after each Heinrich event. Sea ice changes are also used to explain the colder-than-ambient glacial conditions around the time of the glacier discharge. The abrupt warming events occur in this mechanism, owing to rapid sea ice melting which warmed the atmosphere via the strong sea ice albedo and insulating feedbacks. Such abrupt sea ice changes can also account for the warming observed during Dansgaard-Oeschger events. The sea ice changes are caused by a weak (order of 5 Sv) response of the thermohaline circulation (THC) to glacier discharges. The main point of this work is therefore that sea ice may be thought of as a very effective amplifier of a weak THC variability, explaining the abrupt temperature changes over Greenland. Synchronous ice sheet collapses from different ice sheets around the North Atlantic, indicated by some proxy records, are shown to be possible via the weak coupling between the different ice sheets by the atmospheric temperature changes caused by the sea ice changes. This weak coupling can lead to a “nonlinear phase locking” of the different ice sheets which therefore discharge synchronously. It is shown that the phase locking may also lead to “precursor” glacier discharge events from smaller ice sheets before the Laurentide Ice Sheet discharges. The precursor events in this mechanism are the result rather than the cause of the major glacier discharges from the Laurentide Ice Sheet. Earth and Planetary Sciences Version of Record |
format |
Article in Journal/Newspaper |
author |
Kaspi, Yohai Sayag, Roiy Tziperman, Eli |
spellingShingle |
Kaspi, Yohai Sayag, Roiy Tziperman, Eli A “Triple Sea-Ice State” Mechanism for the Abrupt Warming and Synchronous Ice Sheet Collapses During Heinrich Events |
author_facet |
Kaspi, Yohai Sayag, Roiy Tziperman, Eli |
author_sort |
Kaspi, Yohai |
title |
A “Triple Sea-Ice State” Mechanism for the Abrupt Warming and Synchronous Ice Sheet Collapses During Heinrich Events |
title_short |
A “Triple Sea-Ice State” Mechanism for the Abrupt Warming and Synchronous Ice Sheet Collapses During Heinrich Events |
title_full |
A “Triple Sea-Ice State” Mechanism for the Abrupt Warming and Synchronous Ice Sheet Collapses During Heinrich Events |
title_fullStr |
A “Triple Sea-Ice State” Mechanism for the Abrupt Warming and Synchronous Ice Sheet Collapses During Heinrich Events |
title_full_unstemmed |
A “Triple Sea-Ice State” Mechanism for the Abrupt Warming and Synchronous Ice Sheet Collapses During Heinrich Events |
title_sort |
“triple sea-ice state” mechanism for the abrupt warming and synchronous ice sheet collapses during heinrich events |
publisher |
American Geophysical Union |
publishDate |
2004 |
url |
http://nrs.harvard.edu/urn-3:HUL.InstRepos:3440625 https://doi.org/10.1029/2004PA001009 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Dansgaard-Oeschger events glacier Greenland Ice Sheet North Atlantic Sea ice |
genre_facet |
Dansgaard-Oeschger events glacier Greenland Ice Sheet North Atlantic Sea ice |
op_relation |
http://dx.doi.org/10.1029/2004PA001009 Paleoceanography Kaspi, Yohai, Roiy Sayag, and Eli Tziperman. 2004. A "triple sea-ice state" mechanism for the abrupt warming and synchronous ice sheet collapses during heinrich events. Paleoceanography, 19(PA3004): 1-12. 0883-8305 http://nrs.harvard.edu/urn-3:HUL.InstRepos:3440625 doi:10.1029/2004PA001009 |
op_doi |
https://doi.org/10.1029/2004PA001009 |
container_title |
Paleoceanography |
container_volume |
19 |
container_issue |
3 |
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n/a |
op_container_end_page |
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1766395953728716800 |