Type of Publication: | Journal article |
URI (citable link): | http://nbn-resolving.de/urn:nbn:de:bsz:352-0-282486 |
Author: | Caley, Thibaut; Peeters, Frank J. C.; Biastoch, Arne; Rossignol, Linda; van Sebille, Erik; Durgadoo, Jonathan; Malaizé, Bruno; Giraudeau, Jacques; Arthur, Kristina; Zahn, Rainer |
Year of publication: | 2014 |
Published in: | Geophysical Research Letters ; 41 (2014), 4. - pp. 1238-1246. - ISSN 0094-8276. - eISSN 1944-8007 |
DOI (citable link): | https://dx.doi.org/10.1002/2014GL059278 |
Summary: |
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.
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Subject (DDC): | 570 Biosciences, Biology |
Keywords: | quantitative palaeo Agulhas leakage, planktic foraminiferal, numerical ocean model, overturning circulation |
Link to License: | In Copyright |
Bibliography of Konstanz: | Yes |
CALEY, Thibaut, Frank J. C. PEETERS, Arne BIASTOCH, Linda ROSSIGNOL, Erik VAN SEBILLE, Jonathan DURGADOO, Bruno MALAIZÉ, Jacques GIRAUDEAU, Kristina ARTHUR, Rainer ZAHN, 2014. Quantitative estimate of the paleo-Agulhas leakage. In: Geophysical Research Letters. 41(4), pp. 1238-1246. ISSN 0094-8276. eISSN 1944-8007. Available under: doi: 10.1002/2014GL059278
@article{Caley2014Quant-30278, title={Quantitative estimate of the paleo-Agulhas leakage}, year={2014}, doi={10.1002/2014GL059278}, number={4}, volume={41}, issn={0094-8276}, journal={Geophysical Research Letters}, pages={1238--1246}, author={Caley, Thibaut and Peeters, Frank J. C. and Biastoch, Arne and Rossignol, Linda and van Sebille, Erik and Durgadoo, Jonathan and Malaizé, Bruno and Giraudeau, Jacques and Arthur, Kristina and Zahn, Rainer} }
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