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A formal averaging procedure over the air-sea interface is developed for bothmomentum and enthalpy surface-transfer coefficients, C_D and C_K, in hurricaneconditions. This leads to splitting of both the transfer coefficients acrossthe total area of the sea surface, C_(D,K), into the sums of their partialvalues over the foam-free, C_(D,Kw), and foam-covered, C_(D,Kf), fractionsweighted with foam- and water-coverage coefficients {\alpha}f and 1-{\alpha}f .The transfer coefficients, C_(D,K) and C_(D,Kw), are estimated by measurementsin open-sea and in laboratory conditions, respectively, while the transfercoefficients across the foam-covered fraction, C_(D,Kf), which cannot bemeasured directly, are estimated from the splitting relations. Applying theMonin-Obukhov similarity theory at the neutral stability atmospheric conditionsto the transfer coefficients, separately to the foam-free, the foam-covered,and the total sea surfaces, yields the roughness lengths,Z_(D,Kw),Z_(D,Kf),Z_(D,K). The study is aimed at explaining an anomalousbehavior of the momentum and enthalpy transfer coefficients, C_D and C_K, withwind speed U10 under hurricane conditions, by the effect of the foam slippinglayer sandwiched between the atmosphere and the ocean.

Modeling of the drag and thermal conductivity coefficients in tropical cyclones taking into account foam cover