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

Thornalley, DJ; Bauch, HA; Gebbie, G; Guo, W; Ziegler, M; Bernasconi, SM; Barker, S; ... Yu, J; + view all (2015) A warm and poorly ventilated deep Arctic Mediterranean during the last glacial period. Science , 349 (6249) pp. 706-710. 10.1126/science.aaa9554. Green open access

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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.

Type: Article
Title: A warm and poorly ventilated deep Arctic Mediterranean during the last glacial period
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1126/science.aaa9554
Publisher version: http://dx.doi.org/10.1126/science.aaa9554
Language: English
Additional information: "This is the author's version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science 349(6249) on 14 August 2015, doi: http://dx.doi.org/10.1126/science.aaa9554.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL SLASH
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Dept of Geography
URI: https://discovery.ucl.ac.uk/id/eprint/1472807
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