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South African Journal of Science

Print version ISSN 0038-2353

Abstract

ANSORGE, I.J. et al. The first oceanographic survey of the Conrad Rise. S. Afr. j. sci. [online]. 2008, vol.104, n.9-10, pp. 333-336. ISSN 0038-2353.

This article presents data collected during the first hydrographic survey of the Conrad Rise, South-West Indian Ocean. Past investigations have shown that the Conrad Rise acts as an obstacle to the flow of the Antarctic Circumpolar Current (ACC). Numerical modelled data suggest that two eastward-flowing jets are formed on the northern and southern extremities of the rise as a result of the bifurcation of the ACC. Hydrographic data collected during the research cruise corroborate the model findings and provide a wealth of empirical data for further investigation of this dynamic ocean region. Counts of seabirds conducted during the cruise revealed unusually large numbers of penguins and diving petrels associated with the frontal jets, suggesting that the area is important for the large populations of penguins breeding at the Prince Edward and Crozet islands farther north.

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