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A warm and poorly ventilated deep Arctic Mediterranean during the last glacial period

Thornalley, D. J. R., Bauch, H. A., Gebbie, G., Guo, W., Ziegler, M., Bernasconi, S. M., Barker, Stephen, Skinner, L. C. and Yu, J. 2015. A warm and poorly ventilated deep Arctic Mediterranean during the last glacial period. Science 349 (6249) , pp. 706-710. 10.1126/science.aaa9554

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Abstract

Changes in the formation of dense water in the Arctic Ocean and Nordic Seas [the “Arctic Mediterranean” (AM)] probably contributed to the altered climate of the last glacial period. We examined past changes in AM circulation by reconstructing radiocarbon ventilation ages of the deep Nordic Seas over the past 30,000 years. Our results show that the glacial deep AM was extremely poorly ventilated (ventilation ages of up to 10,000 years). Subsequent episodic overflow of aged water into the mid-depth North Atlantic occurred during deglaciation. Proxy data also suggest that the deep glacial AM was ~2° to 3°C warmer than modern temperatures; deglacial mixing of the deep AM with the upper ocean thus potentially contributed to the melting of sea ice, icebergs, and terminal ice-sheet margins.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > QE Geology
Publisher: American Association for the Advancement of Science
ISSN: 0036-8075
Funders: NERC
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 8 July 2015
Last Modified: 27 Jun 2019 14:02
URI: http://orca.cf.ac.uk/id/eprint/76298

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