Experimental results on suppression of fine sea-surface structures by surfactant in terms of the roughness length obtained from wind profiles and of the wave-energy density from sun-glitter photographs, wave-staff measurements, and microwave returns are analyzed. The suppression was shown to be most effective at low winds, say below 7 m s−1, and for wave components with their lengths between 2 and 40 cm. Both wave-staff and microwave measurements further indicate that the maximum suppression can be up to about 95%, occurring at surface-wave lengths of 4–5 cm. Other features of reported experiments were also discussed.

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