Abstract
Based on a combination of laboratory and field data, the influence of wind waves on wind stress with respect to sea-surface roughness z0 and drag coefficient CD was comprehensively analyzed. Wave steepness is an internal parameter denoting wave stability and is directly related to z0. Wave age is an external parameter representing the ability of wind to input energy into waves. In low and moderate winds, wave steepness increases monotonically with decreasing wave age, which is equivalent to the growth relationships of wind waves. In high winds, wave steepness reaches a maximum due to intense wave breaking and remains as a constant, whereas wave age continues to decrease with increasing wind speed. The dimensionless roughness z0/Hs as a function of wave steepness is more suitable than wave age, because wave height is related to wave age through the growth relationships of wind waves. In low and moderate winds, wave steepness can be replaced by wave age; CD increases with the wind speed, with a weak dependence on wave state. In high winds, intense wave breaking results in the collapse of the relationship between wave steepness and wave age, and CD decreases significantly with decreasing wave age and levels off with wind speed. Further, the reduction of CD in high winds is a matter of fact if both their data are available.
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Acknowledgements
The efforts of the researchers who obtained and published the data used in this study, as well as their funding organizations, are much appreciated. All the observational data used are from the cited references. This work was financially supported by the National Natural Science Foundation of China (NSFC) (41876010,41276015), the Public Science and Technology Research Funds Projects of Ocean (201505007), the Joint Project for the National Oceanographic Center by the NSFC and Shandong Government (U1406402), and the Doctoral Fund of Ministry of Education of China (20120132110004).
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Zhao, D., Li, M. Dependence of wind stress across an air–sea interface on wave states. J Oceanogr 75, 207–223 (2019). https://doi.org/10.1007/s10872-018-0494-9
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DOI: https://doi.org/10.1007/s10872-018-0494-9