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Space-time behaviour of the Angola-Benguela Frontal Zone during the Benguela Niño of April 1999

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The hydrographic conditions in the south-east Atlantic were investigated during the cruise of R/V Poseidon in April 1999. The area of investigation covers the two major eastern boundary currents of the Southern Atlantic and its convergence in the Angola-Benguela Frontal Zone (ABFZ). Hydrographic measurements have been carried out in combination with current measurements and are supplemented with remote sensing data of sea surface temperature (SST) and wind stress.

The Angola Current transported in its surface part less saline water from the great rivers in the north towards the ABFZ. At the same time, south of the front, strong coastal upwelling in the Benguela was observed. At the beginning of April 1999 the ABFZ was found at an unusual southern position. The rapid dynamic response of the ABFZ to wind forcing is discussed on the basis of satellite SST images combined with hydrographic measurements.

Document Type: Research Article


Affiliations: 1: Institut für Ostseeforschung Seestraße 15 18119 Rostock-Warnemünde Germany 2: Department of Oceanography University of Cape Town 7700 Rondebosch South Africa 3: Deutsches Zentrum für Marine Biodiversität am Forschungsinstitut Senckenberg Martin-Luther-King-Platz 3 20146 Hamburg Germany

Publication date: April 1, 2004

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