A new parameterization scheme for sea surface aerodynamic roughness

The dimensionless roughness length derived from dimensional analysis bears a relation to wave age, and the dimensionless form of roughness length can be expressed with the relation with significant wave height. Based on six experiments (HEXMAX, RASEX, BIO steady platform, Lake Ontario data analysis FETCH, CBLAST low wind), we verified that the Charnock parameter z_ch and dimensionless roughness length z₀/H_s are dependent on wave age u_*/c_p. Moreover, we constructed a new scheme for roughness length, and explored its sensitivity to friction velocity and wave age. Combining the newly-developed parameterization scheme (PS07) with COARE (Coupled Ocean-Atmosphere Response Experiment V.3.0) algorithm, we calculated the data from the North Sea Platform experiment in December, 1985, and made an attempt to validate the suitability of the PS07 compared to the other 3 schemes of COARE. We found that the calculated results based on the PS07 are close to the measurements. We also conducted an experiment in which the PS07 was combined with the nested model of waves coupling in datasets of 3 typhoons occurred at the Zhanjiang Seaport. The comparison results between the calculated and observed waves around the Naozhou Island indicate that the new parameterization scheme (PS07) has a good applicability.