The atmosphere and the ocean form a coupled system which exchanges heat, momentum and water at the air sea interface. The interface is dynamic and masses and energy are continually transferred across the air sea interface. The energy ?ow from the atmosphere to the ocean generates an aerodynamically rough sea surface. If the energy ?ow is su?ciently intense, at some points the surface waves will lose their stability and eventually break. Breaking is a very localized and non-stationary phenomenon that is a source of vorticity and turbulence. Dissipated energy becomes available for mixing the...