Abstract
Records from moored current meters located off the northern tip of Madagascar in the South Equatorial Current during March–July 1975 indicate a 50-day period oscillation with an amplitude of 12 cm s −1. Meanders of similar amplitude and an approximate wavelength of 400 km could be seen in surface current vectors observed in August 1975 along a section at 11° S. These oscillations are interpreted as evidence of a barotropic Rossby wave. Further evidence can be seen in oscillations in drifter trajectories east of Madagascar. A likely cause for these waves appears to be a globally observed atmospheric oscillation with the same period.
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