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Acoustic Doppler current profiler measurements of possible lee waves south of Key West, Florida

Acoustic Doppler current profiler measurements made while underway in 200–240 m of water south of Key West, Florida, show wavelike signals with about 1 km horizontal wavelength and 3–5 cm s−1 amplitude vertical velocity. Vertical displacements of about 5 m are inferred from coherent oscillations in surfaces of constant acoustic backscatter, in features associated with the width of the peak in the Doppler spectrum, and in fine structure of vertical current shear. While the sampling was limited, all the measurable waves occurred over irregular bathymetry in the presence of an east-northeastward mean flow U > 1 m s−1 (averaged over 30- to 90-m depth). The peak strain rate associated with the waves was nearly 1 × 10−3 s−1 at 12-m depth, and this could have produced bands of smooth and rough water observed at the surface. We tentatively identify the waves as being topographically forced by the Florida Current flowing over a rough continental margin.