155,000 years of West African monsoon and ocean thermal evolution

Weldeab, Syee, Lea, David W., Schneider, Ralph and Andersen, Nils (2007) 155,000 years of West African monsoon and ocean thermal evolution Science, 316 (5829). pp. 1303-1307. DOI 10.1126/science.1140461.

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A detailed reconstruction of West African monsoon hydrology over the past 155,000 years suggests a close linkage to northern high-latitude climate oscillations. Ba/Ca ratio and oxygen isotope composition of planktonic foraminifera in a marine sediment core from the Gulf of Guinea, in the eastern equatorial Atlantic (EEA), reveal centennial-scale variations of riverine freshwater input that are synchronous with northern high-latitude stadials and interstadials of the penultimate interglacial and the last deglaciation. EEA Mg/Ca-based sea surface temperatures (SSTs) were decoupled from northern high-latitude millennial-scale fluctuation and primarily responded to changes in atmospheric greenhouse gases and low-latitude solar insolation. The onset of enhanced monsoon precipitation lags behind the changes in EEA SSTs by up to 7000 years during glacial-interglacial transitions. This study demonstrates that the stadial-interstadial and deglacial climate instability of the northern high latitudes exerts dominant control on the West African monsoon dynamics through an atmospheric linkage.

Document Type: Article
Keywords: West African monsoon, ocean, thermal evolution
Research affiliation: Kiel University
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
DOI etc.: 10.1126/science.1140461
ISSN: 0036-8075
Projects: Future Ocean
Date Deposited: 28 Apr 2009 14:41
Last Modified: 08 Sep 2016 09:16
URI: http://eprints.uni-kiel.de/id/eprint/6883

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