Abstract
At an array of current meters and temperature sensors 400 m deep over the continental shelf, strong motions were observed at frequencies in the semidiurnal tidal band and it its first overtide. These motions are probably due to the bottom slope, which is slightly less steep than the characteristic slope of internal waves at the overtide frequency. The tidal currents are strongest in the longshore direction while the overtide currents are strongest in the up-down slope direction. Analysis shows the motions to be parts of large coherent structures within the water column; the tidal structure is composed of baroclinic and barotropic components while the overtide structure is baroclinic. The observations are consistent with the idea of generation of the baroclinic motions in both frequency bands by the action of the barotropic tide over the sloping bottom, but the mechanism of interaction is poorly understood.
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