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The study is motivated by recent findings of the decrease in the momentumtransfer from strong winds to sea. The Kelvin-Helmholtz instability (KHI) of athree-fluid system of air, foam and water is examined within the range ofintermediately short surface waves. The foam layer thickness necessary foreffective separation of the atmosphere and the ocean is estimated. Due to highdensity contrasts in the three-fluid system, even a relatively thin foam layerbetween the atmosphere and the ocean can provide a significant stabilization ofthe water surface by the wavelength shift of the instability towards smallerscales. It is conjectured that such stabilization qualitatively explains theobserved reduction of roughness and drag.

Wind-wave stabilization by a foam layer between the atmosphere and the ocean