The drag coefficient of the sea surface has been measured with a telemetering thrust anemometer on a stable platform. The mean value for 32 runs, C10 = 1.35 × 10−3 ± 0.34 × 10−3 is believed to be representative of open-sea conditions. No significant variation of the drag coefficient with wind speeds from 7 to 16 m/sec is detected. Downwind-vertical quadrature spectra are consistently negative between 0.1 and 1 Hz.
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Stuart D. Smith (1970) studied this question.