A stagnation event in the deep South Atlantic during the last interglacial period

Hayes, Christopher T. and Martinez-Garcia, Alfredo and Hasenfratz, Adam P. and Jaccard, Samuel L. and Hodell, David A. and Sigman, Daniel M. and Haug, Gerald H. and Anderson, Robert F. (2014) A stagnation event in the deep South Atlantic during the last interglacial period. Science, 346 (6216). pp. 1514-1517. ISSN 0036-8075 (print), 1095-9203 (online) DOI 10.1126/science.1256620

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Official URL: http://www.sciencemag.org/content/346/6216/1514

Abstract

During the last interglacial period, global temperatures were ~2°C warmer than at present and sea level was 6 to 8 meters higher. Southern Ocean sediments reveal a spike in authigenic uranium 127,000 years ago, within the last interglacial, reflecting decreased oxygenation of deep water by Antarctic Bottom Water (AABW). Unlike ice age reductions in AABW, the interglacial stagnation event appears decoupled from open ocean conditions and may have resulted from coastal freshening due to mass loss from the Antarctic ice sheet. AABW reduction coincided with increased North Atlantic Deep Water (NADW) formation, and the subsequent reinvigoration in AABW coincided with reduced NADW formation. Thus, alternation of deep water formation between the Antarctic and the North Atlantic, believed to characterize ice ages, apparently also occurs in warm climates.

Item Type: Article
Uncontrolled Keywords: 2014AREP; IA68;
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Science
Volume: 346
Page Range: pp. 1514-1517
Identification Number: 10.1126/science.1256620
Depositing User: Sarah Humbert
Date Deposited: 06 Feb 2015 18:04
Last Modified: 16 Feb 2015 18:14
URI: http://eprints.esc.cam.ac.uk/id/eprint/3232

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