Abstract
Six parameterization schemes of roughness or drag coefficient are evaluated on the basis of the data from six experiments. They present great consistency with measurement when friction velocity u*<0.5 m/s (approximately corresponding to 10 m wind speed U 10<12 m/s) and large deviation from measurement when u*⩾0.5m/s (approximatelyU 10⩾12m/s). In order to improve the deviation, a newparameterization of drag coefficient is derived on the basis of the similarity theory, Charnock relationship and Toba 3/2 power law. Wave steepness andwind-sea Reynolds number are considered in the new parameterization. Then it is tested on the basis of the measurements and shows significant improvement when u* ⩾0.5 m/s. Its standard errors are much smaller than the ones of the other six parameterizations. However, the new parameterization still needs more tests especially for high winds.
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Foundation item: The National Basic Research Program of China under contract Nos 2011CB403501 and 2012CB417402; the Fund for Creative Research Groups by the National Natural Science Foundation of China under contract No. 41121064.
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Wang, J., Song, J., Huang, Y. et al. On the parameterization of drag coefficient over sea surface. Acta Oceanol. Sin. 32, 68–74 (2013). https://doi.org/10.1007/s13131-013-0315-3
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DOI: https://doi.org/10.1007/s13131-013-0315-3