A Lagrangian analysis of the Indian-Atlantic interocean exchange in a regional model

Authors

  • A. M. Doglioli,

    1. Laboratoire de Physique des Océans, UMR 6523, Centre National de la Recherche Scientifique, Institut Français de Recherche pour l'Exploitation de la Mer, Université de Bretagne Occidentale, Brest, France
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  • M. Veneziani,

    1. Rosenstiel School of Marine and Atmospheric Sciences, Division of Meteorology and Physical Oceanography, University of Miami, 4600 Rickenbacker Causeway, Miami, Florida, USA
    2. Now at Ocean Sciences Department, University of California, Santa Cruz, California, USA.
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  • B. Blanke,

    1. Laboratoire de Physique des Océans, UMR 6523, Centre National de la Recherche Scientifique, Institut Français de Recherche pour l'Exploitation de la Mer, Université de Bretagne Occidentale, Brest, France
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  • S. Speich,

    1. Laboratoire de Physique des Océans, UMR 6523, Centre National de la Recherche Scientifique, Institut Français de Recherche pour l'Exploitation de la Mer, Université de Bretagne Occidentale, Brest, France
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  • A. Griffa

    1. Rosenstiel School of Marine and Atmospheric Sciences, Division of Meteorology and Physical Oceanography, University of Miami, 4600 Rickenbacker Causeway, Miami, Florida, USA
    2. Istituto di Scienze Marine, Consiglio Nazionale delle Ricerche, La Spezia, Italy
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Abstract

[1] We present a new numerical Lagrangian technique based on the coupling of transport computation with spin analysis of trajectories. This method was applied to results from a high-resolution numerical model of the oceanic region around South Africa. We estimated an Indian-Atlantic leakage of about 14 Sv. In the western Cape Basin, approximately 30% of this transport is due to trapping eddies with a ratio between cyclones and anticyclones transport of 1.3. These findings are briefly discussed with respect to recent observations of the highly nonlinear regime found in this area of the Cape Basin.

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