North Atlantic Deep Water Production during the Last Glacial Maximum

Type Article
Date 2016-06
Language English
Author(s) Howe Jacob N. W.1, Piotrowski Alexander M.1, Noble Taryn L.1, 2, Mulitza Stefan3, Chiessi Cristiano M.4, Bayon Germain5
Affiliation(s) 1 : Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England.
2 : Univ Tasmania, IMAS, Hobart, Tas 7001, Australia.
3 : Univ Bremen, MARUM Ctr Marine Environm Sci, Leobener Str, D-28359 Bremen, Germany.
4 : Univ Sao Paulo, Sch Arts Sci & Humanities, Av Arlindo Bettio 1000, BR-03828000 Sao Paulo, SP, Brazil.
5 : Inst Francais Rech Exploitat Mer IFREMER, Unite Rech Geosci Marines, F-29280 Plouzane, France.
Source Nature Communications (2041-1723) (Nature Publishing Group), 2016-06 , Vol. 7 , N. 11765 , P. 1-8
DOI 10.1038/ncomms11765
WOS© Times Cited 89
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 delta C-13 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.
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