Deep-water circulation changes lead North Atlantic climate during deglaciation

Muschitiello, Francesco and D’Andrea, William J. and Schmittner, Andreas and Heaton, Timothy J. and Balascio, Nicholas L. and deRoberts, Nicole and Caffee, Marc W. and Woodruff, Thomas E. and Welten, Kees C. and Skinner, Luke C. and Simon, Margit H. and Dokken, Trond M. (2019) Deep-water circulation changes lead North Atlantic climate during deglaciation. Nature Communications, 10 (1). ISSN 2041-1723 DOI https://doi.org/10.1038/s41467-019-09237-3

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Abstract

Constraining the response time of the climate system to changes in North Atlantic Deep Water (NADW) formation is fundamental to improving climate and Atlantic Meridional Overturning Circulation predictability. Here we report a new synchronization of terrestrial, marine, and ice-core records, which allows the first quantitative determination of the response time of North Atlantic climate to changes in high-latitude NADW formation rate during the last deglaciation. Using a continuous record of deep water ventilation from the Nordic Seas, we identify a ∼400-year lead of changes in high-latitude NADW formation ahead of abrupt climate changes recorded in Greenland ice cores at the onset and end of the Younger Dryas stadial, which likely occurred in response to gradual changes in temperature- and wind-driven freshwater transport. We suggest that variations in Nordic Seas deep-water circulation are precursors to abrupt climate changes and that future model studies should address this phasing.

Item Type: Article
Uncontrolled Keywords: 2018AREP; IA74
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
07 - Gold Open Access
Journal or Publication Title: Nature Communications
Volume: 10
Identification Number: https://doi.org/10.1038/s41467-019-09237-3
Depositing User: Sarah Humbert
Date Deposited: 11 Apr 2019 21:08
Last Modified: 11 Apr 2019 21:08
URI: http://eprints.esc.cam.ac.uk/id/eprint/4472

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