Abstract
A western margin frontal zone is described, from measurements of temperature, salinity and currents, in a section taken with R/V Prof. W. Besnard in December 1980, crossing the shelf break border at latitude 26o30'S. The analyses of the sections showed consistently the occurrence of an ascension of the T and S isolines over the shelf break. Simultaneous current measurements showed a surface eddy structure with clockwise circulation and anti-clockwise circulation having a common stem over the break characterizing a shelf break upwelling.
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