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The Atlantic Meridional Overturning Circulation and Abrupt Climate Change

The Atlantic Meridional Overturning Circulation and Abrupt Climate Change

Annual Review of Marine Science 9: 83-104

ISSN/ISBN: 1941-1405

PMID: 27814029

DOI: 10.1146/annurev-marine-010816-060415

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.

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Accession: 058992513

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