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

Thornalley, D. J. R. and Bauch, H. A. and Gebbie, G. and Guo, W. and Ziegler, M. and Bernasconi, S. M. and Barker, S. and 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. ISSN 0036-8075 DOI 10.1126/science.aaa9554

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Official URL: http://dx.doi.org/10.1126/science.aaa9554

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
Uncontrolled Keywords: 2015AREP; IA69; weekly list
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Science
Volume: 349
Page Range: pp. 706-710
Identification Number: 10.1126/science.aaa9554
Depositing User: Sarah Humbert
Date Deposited: 24 Jan 2016 22:26
Last Modified: 24 Jan 2016 22:26
URI: http://eprints.esc.cam.ac.uk/id/eprint/3577

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