North Atlantic deep water production during the last glacial maximum

Howe, J. N. W. and Piotrowski, A. M. and Noble, T. L. and Mulitza, S. and Chiessi, C. M. and Bayon, G. (2016) North Atlantic deep water production during the last glacial maximum. Nature Communications, 7. p. 11765. ISSN 2041-1723 DOI 10.1038/ncomms11765

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Official URL: http://www.nature.com/ncomms/2016/160603/ncomms117...

Abstract

Changes in deep ocean ventilation are commonly invoked as the primary cause of lower glacial atmospheric CO2. The water mass structure of the glacial deep Atlantic Ocean and the mechanism by which it may have sequestered carbon remain elusive. Here we present neodymium isotope measurements from cores throughout the Atlantic that reveal glacial–interglacial changes in water mass distributions. These results demonstrate the sustained production of North Atlantic Deep Water under glacial conditions, indicating that southern-sourced waters were not as spatially extensive during the Last Glacial Maximum as previously believed. We demonstrate that the depleted glacial δ13C values in the deep Atlantic Ocean cannot be explained solely by water mass source changes. A greater amount of respired carbon, therefore, must have been stored in the abyssal Atlantic during the Last Glacial Maximum. We infer that this was achieved by a sluggish deep overturning cell, comprised of well-mixed northern- and southern-sourced waters.

Item Type: Article
Uncontrolled Keywords: 2015AREP; IA70; weekly list
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
07 - Gold Open Access
Journal or Publication Title: Nature Communications
Volume: 7
Page Range: p. 11765
Identification Number: 10.1038/ncomms11765
Depositing User: Sarah Humbert
Date Deposited: 08 Apr 2016 10:07
Last Modified: 09 Jun 2016 23:34
URI: http://eprints.esc.cam.ac.uk/id/eprint/3604

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