Abstract
The relationships between sea surface roughness z 0 and wind-wave parameters are analyzed, and spurious self-correlations are found in all of the parameterization schemes. Sea surface drag coefficient C D is fitted by four wind-wave parameters that are wave age, wave steepness, windsea Reynolds number R B and R H , and the analyzed data are divided into laboratory, field and combined data sets respectively. Comparison and analysis of dependence of C D on wind-wave parameters show that R B can fit the C D most appropriately. Wave age and wave steepness are not suitable to fit CD with a narrow range data set. When the value of wave age has a board range, R H is not suitable to fit C D either. Three relationships between C D and R B are integrated into the bulk algorithm COARE to calculate the observational friction velocity, and the results show that the relationship between C D and R B which is fitted with field data set can describe the momentum transfer in the open ocean, under low-moderate wind speed condition, most appropriately.
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