Quantitative estimate of the paleo-Agulhas leakage.

Caley, Thibaut, Peeters, Frank J. C., Biastoch, Arne , Rossignol, Linda, van Sebille, Erik, Durgadoo, Jonathan V. , Malaizé, Bruno, Giraudeau, Jacques, Arthur, Kristina and Zahn, Rainer (2014) Quantitative estimate of the paleo-Agulhas leakage. Open Access Geophysical Research Letters, 41 (4). pp. 1238-1246. DOI 10.1002/2014GL059278.

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The Indian-Atlantic water exchange south of Africa (Agulhas leakage) is a key component of the global ocean circulation. No quantitative estimation of the paleo-Agulhas leakage exists. We quantify the variability in interocean exchange over the past 640,000 years, using planktic foraminiferal assemblage data from two marine sediment records to define an Agulhas leakage efficiency index. We confirm the validity of our new approach with a numerical ocean model that realistically simulates the modern Agulhas leakage changes. Our results suggest that, during the past several glacial-interglacial cycles, the Agulhas leakage varied by ~10 sverdrup and more during major climatic transitions. This lends strong credence to the hypothesis that modifications in the leakage played a key role in changing the overturning circulation to full strength mode. Our results are instrumental for validating and quantifying the contribution of the Indian-Atlantic water leakage to the global climate changes.

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/FP7/238512; info:eu-repo/grantAgreement/EC/FP7/243908
Additional Information: WOS:000333022700023
Keywords: quantitative palaeo Agulhas leakage; planktic foraminiferal; numerical ocean model; overturning circulation
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
Refereed: Yes
Open Access Journal?: No
Publisher: AGU (American Geophysical Union), Wiley
Projects: Past4Future, MOMIES, GATEWAYS
Date Deposited: 24 Apr 2014 08:05
Last Modified: 10 Apr 2017 08:43
URI: https://oceanrep.geomar.de/id/eprint/24365

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