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The Atlantic Meridional Overturning Circulation and Abrupt Climate Change

The Atlantic Meridional Overturning Circulation and Abrupt Climate Change Abrupt changes in climate have occurred in many locations around the globe over the last glacial cycle, with pronounced temperature swings on timescales of decades or less in the North Atlantic. The global pattern of these changes suggests that they reflect variability in the Atlantic meridional overturning circulation (AMOC). This review examines the evidence from ocean sediments for ocean circulation change over these abrupt events. The evidence for changes in the strength and structure of the AMOC associated with the Younger Dryas and many of the Heinrich events is strong. Although it has been difficult to directly document changes in the AMOC over the relatively short Dansgaard-Oeschger events, there is recent evidence supporting AMOC changes over most of these oscillations as well. The lack of direct evidence for circulation changes over the shortest events leaves open the possibility of other driving mechanisms for millennial-scale climate variability. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annual Review of Marine Science Annual Reviews

The Atlantic Meridional Overturning Circulation and Abrupt Climate Change

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References (120)

Publisher
Annual Reviews
Copyright
Copyright © 2017 by Annual Reviews. All rights reserved
ISSN
1941-1405
eISSN
1941-0611
DOI
10.1146/annurev-marine-010816-060415
pmid
27814029
Publisher site
See Article on Publisher Site

Abstract

Abrupt changes in climate have occurred in many locations around the globe over the last glacial cycle, with pronounced temperature swings on timescales of decades or less in the North Atlantic. The global pattern of these changes suggests that they reflect variability in the Atlantic meridional overturning circulation (AMOC). This review examines the evidence from ocean sediments for ocean circulation change over these abrupt events. The evidence for changes in the strength and structure of the AMOC associated with the Younger Dryas and many of the Heinrich events is strong. Although it has been difficult to directly document changes in the AMOC over the relatively short Dansgaard-Oeschger events, there is recent evidence supporting AMOC changes over most of these oscillations as well. The lack of direct evidence for circulation changes over the shortest events leaves open the possibility of other driving mechanisms for millennial-scale climate variability.

Journal

Annual Review of Marine ScienceAnnual Reviews

Published: Jan 3, 2017

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