Breakup of last glacial deep stratification in the South Pacific.

Basak, Chandranath, Fröllje, Henning, Lamy, Frank, Gersonde, Rainer, Benz, Verena, Anderson, Robert F., Molina-Kescher, Mario and Pahnke, Katharina (2018) Breakup of last glacial deep stratification in the South Pacific. Science, 359 (6378). pp. 900-904. DOI 10.1126/science.aao2473.

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Abstract

Stratification of the deep Southern Ocean during the Last Glacial Maximum is thought to have facilitated carbon storage and subsequent release during the deglaciation as stratification broke down, contributing to atmospheric CO2 rise. Here, we present neodymium isotope evidence from deep to abyssal waters in the South Pacific that confirms stratification of the deepwater column during the Last Glacial Maximum. The results indicate a glacial northward expansion of Ross Sea Bottom Water and a Southern Hemisphere climate trigger for the deglacial breakup of deep stratification. It highlights the important role of abyssal waters in sustaining a deep glacial carbon reservoir and Southern Hemisphere climate change as a prerequisite for the destabilization of the water column and hence the deglacial release of sequestered CO2 through upwelling.

Document Type: Article
Keywords: Last glacial deep stratification, South Pacific
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
AWI
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1126/science.aao2473
ISSN: 0036-8075
Related URLs:
Expeditions/Models/Experiments:
Date Deposited: 26 Feb 2018 08:03
Last Modified: 01 Feb 2019 15:04
URI: http://oceanrep.geomar.de/id/eprint/42016

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