L (2006) Glacial abrupt climate changes and Dansgaard–Oeschger oscillations in a coupled climate model
[1] There are three fundamental features which characterize large glacial millennial (Dansgaard-Oeschger) oscillations: (1) the climatic transitions were abrupt and large; (2) the lengths of both interstadials and stadials and the period of Dansgaard-Oeschger oscillations were not uniform; and (3) t...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.476.1298 2023-05-15T16:30:07+02:00 L (2006) Glacial abrupt climate changes and Dansgaard–Oeschger oscillations in a coupled climate model Zhaomin Wang Lawrence A. Mysak The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.476.1298 http://www.esmg.mcgill.ca/zhaomin_paper/Paleoceanography.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.476.1298 http://www.esmg.mcgill.ca/zhaomin_paper/Paleoceanography.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.esmg.mcgill.ca/zhaomin_paper/Paleoceanography.pdf oscillations [Dansgaard et al 1993 North Greenland Ice text ftciteseerx 2016-01-08T07:35:44Z [1] There are three fundamental features which characterize large glacial millennial (Dansgaard-Oeschger) oscillations: (1) the climatic transitions were abrupt and large; (2) the lengths of both interstadials and stadials and the period of Dansgaard-Oeschger oscillations were not uniform; and (3) there were no large millennial oscillations during an early stage of a glacial period and a peak glacial period. In this modeling study we offer a consistent explanation for these three features by employing an Earth system Model of Intermediate Complexity. We demonstrate that a moderate global cooling forces the Atlantic meridional overturning circulation (MOC) into an unstable state and hence causes the flip-flop of the Atlantic MOC between a strong mode and a weak mode. The durations of both interstadials and stadials associated with these millennial oscillations are modulated by the changing background climate in qualitative agreement with the observations. In a warm climate the Atlantic MOC is strong and stable, with the deep water formed mainly by intense heat loss to the atmosphere. In a cold climate the Atlantic MOC is weak and stable, and this mode is largely maintained by the process of sea ice brine rejection. Since the Dansgaard-Oeschger oscillations result from an alternation between these two MOC states during an intermediate phase climate, we conclude that brine rejection plays a necessary role in the oscillations, confirming a hypothesis suggested in some proxy data studies. Citation: Wang, Z., and L. A. Mysak (2006), Glacial abrupt climate changes and Dansgaard-Oeschger oscillations in a coupled climate model, Paleoceanography, 21, PA2001, doi:10.1029/2005PA001238. 1. Text Greenland North Greenland Sea ice Unknown Flop ENVELOPE(-56.753,-56.753,-61.028,-61.028) Greenland |
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English |
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oscillations [Dansgaard et al 1993 North Greenland Ice |
spellingShingle |
oscillations [Dansgaard et al 1993 North Greenland Ice Zhaomin Wang Lawrence A. Mysak L (2006) Glacial abrupt climate changes and Dansgaard–Oeschger oscillations in a coupled climate model |
topic_facet |
oscillations [Dansgaard et al 1993 North Greenland Ice |
description |
[1] There are three fundamental features which characterize large glacial millennial (Dansgaard-Oeschger) oscillations: (1) the climatic transitions were abrupt and large; (2) the lengths of both interstadials and stadials and the period of Dansgaard-Oeschger oscillations were not uniform; and (3) there were no large millennial oscillations during an early stage of a glacial period and a peak glacial period. In this modeling study we offer a consistent explanation for these three features by employing an Earth system Model of Intermediate Complexity. We demonstrate that a moderate global cooling forces the Atlantic meridional overturning circulation (MOC) into an unstable state and hence causes the flip-flop of the Atlantic MOC between a strong mode and a weak mode. The durations of both interstadials and stadials associated with these millennial oscillations are modulated by the changing background climate in qualitative agreement with the observations. In a warm climate the Atlantic MOC is strong and stable, with the deep water formed mainly by intense heat loss to the atmosphere. In a cold climate the Atlantic MOC is weak and stable, and this mode is largely maintained by the process of sea ice brine rejection. Since the Dansgaard-Oeschger oscillations result from an alternation between these two MOC states during an intermediate phase climate, we conclude that brine rejection plays a necessary role in the oscillations, confirming a hypothesis suggested in some proxy data studies. Citation: Wang, Z., and L. A. Mysak (2006), Glacial abrupt climate changes and Dansgaard-Oeschger oscillations in a coupled climate model, Paleoceanography, 21, PA2001, doi:10.1029/2005PA001238. 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Zhaomin Wang Lawrence A. Mysak |
author_facet |
Zhaomin Wang Lawrence A. Mysak |
author_sort |
Zhaomin Wang |
title |
L (2006) Glacial abrupt climate changes and Dansgaard–Oeschger oscillations in a coupled climate model |
title_short |
L (2006) Glacial abrupt climate changes and Dansgaard–Oeschger oscillations in a coupled climate model |
title_full |
L (2006) Glacial abrupt climate changes and Dansgaard–Oeschger oscillations in a coupled climate model |
title_fullStr |
L (2006) Glacial abrupt climate changes and Dansgaard–Oeschger oscillations in a coupled climate model |
title_full_unstemmed |
L (2006) Glacial abrupt climate changes and Dansgaard–Oeschger oscillations in a coupled climate model |
title_sort |
l (2006) glacial abrupt climate changes and dansgaard–oeschger oscillations in a coupled climate model |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.476.1298 http://www.esmg.mcgill.ca/zhaomin_paper/Paleoceanography.pdf |
long_lat |
ENVELOPE(-56.753,-56.753,-61.028,-61.028) |
geographic |
Flop Greenland |
geographic_facet |
Flop Greenland |
genre |
Greenland North Greenland Sea ice |
genre_facet |
Greenland North Greenland Sea ice |
op_source |
http://www.esmg.mcgill.ca/zhaomin_paper/Paleoceanography.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.476.1298 http://www.esmg.mcgill.ca/zhaomin_paper/Paleoceanography.pdf |
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1766019840656539648 |