Quantitative estimate of the paleo-Agulhas leakage

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2014
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Caley, Thibaut
Biastoch, Arne
Rossignol, Linda
van Sebille, Erik
Durgadoo, Jonathan
Malaizé, Bruno
Giraudeau, Jacques
Arthur, Kristina
Zahn, Rainer
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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.

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570 Biowissenschaften, Biologie
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quantitative palaeo Agulhas leakage, planktic foraminiferal, numerical ocean model, overturning circulation
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ISO 690CALEY, Thibaut, Frank 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. 2014, 41(4), pp. 1238-1246. ISSN 0094-8276. eISSN 1944-8007. Available under: doi: 10.1002/2014GL059278
BibTex
@article{Caley2014Quant-30278,
  year={2014},
  doi={10.1002/2014GL059278},
  title={Quantitative estimate of the paleo-Agulhas leakage},
  number={4},
  volume={41},
  issn={0094-8276},
  journal={Geophysical Research Letters},
  pages={1238--1246},
  author={Caley, Thibaut and Peeters, Frank 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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