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Min Liu,Bailin Yang 한국해양과학기술원 2022 Ocean science journal Vol.57 No.2
This study aims to evaluate previous parameterizations of whitecap coverage (W) based on in-situ observational datasets. Ten-meter wind speed measurements over the sea surface (U10) have been the most traditional and effective method of estimating W. A secondary variable—sea surface temperature (Tw)—is considered for better parameterization of W. A non-monotonic relationship is found between the W and Tw because all the coefficients and exponent in the W-U10 power-law fit are Tw-dependent. Therefore, replacing the fixed slope variable of the power-law fit with the positively or negatively Tw-dependent function does not result in significant improvements. When the Tw-dependent coefficients and exponent are embedded in the W parameterization, a better estimation of W is obtained. Tw related parameter of wind-sea Reynolds number contains wavefield information, which is also related to Tw, making wind-sea Reynolds number an optional parameter for estimating W. We suggest that further improvement of W (U10, Tw) parameterization requires consideration of more wavefield information.