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

dc.contributor.author Thornalley, David J. R.
dc.contributor.author Bauch, H. A.
dc.contributor.author Gebbie, Geoffrey A.
dc.contributor.author Guo, Weifu
dc.contributor.author Ziegler, Martin
dc.contributor.author Bernasconi, Stefano M.
dc.contributor.author Barker, Stephen
dc.contributor.author Skinner, Luke C.
dc.contributor.author Yu, Jimin
dc.date.accessioned 2015-08-21T17:10:39Z
dc.date.available 2015-08-21T17:10:39Z
dc.date.issued 2015-07
dc.description Author Posting. © The Author(s), 2015. This is the author's version of the work. It is posted here by permission of American Association for the Advancement of Science for personal use, not for redistribution. The definitive version was published in Science 349 (2015): 706-710, doi:10.1126/science.aaa9554. en_US
dc.description.abstract Changes in the formation of dense water in the Arctic Ocean and Nordic Seas (the ‘Arctic Mediterranean’, AM) likely contributed to the altered climate of the last glacial period. We examine past changes in AM circulation by reconstructing 14C ventilation ages of the deep Nordic Seas over the last 30,000 years. Our results show that the deep glacial 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 the deep glacial AM was ~2-3°C warmer than modern; deglacial mixing of the deep AM with the upper ocean thus potentially contributed to melting sea-ice and icebergs, as well as proximal terminal ice-sheet margins. en_US
dc.description.sponsorship Funding was provided by a WHOI OCCI scholarship and OCCI grant 27071264 (DJRT); WHOI OCCI and NSF grants OIA-1124880 and OCE-1357121 (GG); the WHOI J. Lamar Worzel Assistant Scientist Fund, the Penzance Endowed Fund in Support of Assistant Scientists and NSF ANT-1246387 (WG); EU FP7 Marie Curie grant No. 298513 (MZ), grant DP140101393 (JY); and NERC grant NE/J008133/1 (SB). en_US
dc.format.mimetype application/pdf
dc.identifier.uri https://hdl.handle.net/1912/7486
dc.language.iso en_US en_US
dc.relation.uri https://doi.org/10.1126/science.aaa9554
dc.title A warm and poorly ventilated deep Arctic Mediterranean during the last glacial period en_US
dc.type Preprint en_US
dspace.entity.type Publication
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