The ‘core method’ together with geostrophic computations, is used to make a tentative interpretation of the circulation of the deep water in the southwest Indian Ocean. A deep current towards the north, having the characteristics of a western boundary current, is shown to be deflected and weakened by the complex system of ridges. The existence of a homogeneous body of water, east of 60°E, is attributed to the mixing of the Atlantic deep water with Antarctic waters, the salinity being kept constant by a small inflow of deep water of north Indian Ocean origin.
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