North Atlantic Deep Water Production during the Last Glacial Maximum.

Howe, Jacob N. W., Piotrowski, Alexander M., Noble, Taryn L., Mulitza, Stefan, Chiessi, Cristiano M. and Bayon, Germain (2016) North Atlantic Deep Water Production during the Last Glacial Maximum. Open Access Nature Communications, 7 . Art.Nr. 11765. DOI 10.1038/ncomms11765.

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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.

Document Type: Article
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1038/ncomms11765
ISSN: 2041-1723
Projects: PalMod in-kind
Date Deposited: 11 Sep 2018 11:31
Last Modified: 17 Jan 2019 13:26
URI: http://oceanrep.geomar.de/id/eprint/44216

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