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Revisiting dependences of the drag coefficient at the sea surface on wind speed and sea state

机译：在风速和海水状态下重新探测海面拖曳系数的依赖

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摘要

Accurate representation of wind stress is important for modelling and predictions of marine environmental conditions. The effect of sea state on wind stress is usually parameterized by relating the equivalent sea surface roughness to the wave age or wave steepness. In this study, a new parameterization is presented for the dependences of sea surface roughness on the wind speed and sea state based on observations. Analyses of observations demonstrate that the sea surface roughness is correlated with the wave age stronger than the wave steepness. As a result, the wave-dependent sea surface roughness is parameterized in terms of the wave age in the new parameterization. The new parameterization features that the sea surface roughness has different dependences on the wave age under wind-sea-dominated, mixed and swell-dominated sea states. Younger waves have larger values of the drag coefficient under wind-sea-dominated and mixed sea states but older waves have larger values under swell-dominated sea states. The drag coefficient predicted by the new parameterization is enhanced at low winds and levels off at high winds. The applicability of the new parameterization is investigated using a nested-grid wave model for the northwest Atlantic based on WAVEWATCH Ⅲ. The wave model results during a winter storm in March 2014 are compared with the available measurements from buoys and satellite altimeters over the study region. Our results demonstrate that the new parameterization reduces deficiencies of three existing parameterizations of underestimating significant wave heights (SWHs) at low winds (or old waves) and overestimating SWHs at moderate and high winds (or young waves). Overall, the new parameterization performs the best in predicting SWHs during the winter storm in comparison with the existing schemes.
机译：风力应力的准确表示对于海洋环境条件的建模和预测是重要的。通过将相同的海面粗糙度与波浪时代或波陡度相关的相同海面粗糙度来参数化，海态对风力应力的影响。在这项研究中，介绍了一种新的参数化，用于基于观测的海面粗糙度对风速和海状态的依赖性。观察分析表明海面粗糙度与比波陡度强的波浪年龄相关。结果，在新参数化中的波浪时代，波依赖的海面粗糙度是参数化的。新的参数化特征是海面粗糙度对风海导，混合和膨胀的海洋州下的波浪时代的不同依赖性。较小的波在风海统主导和混合海区下的阻力系数具有更大的拖拉系数，但较旧的波浪在膨胀主导的海洋状态下具有更大的值。新参数化预测的拖动系数在低风中增强，在高风中升温。基于WavewatchⅢ使用西北大西洋的嵌套 - 网格波模型来研究新参数化的适用性。将在2014年3月在冬季风暴期间产生的波模型与研究区上的浮标和卫星高度计的可用测量进行了比较。我们的结果表明，新的参数化降低了在低风（或旧波）下低估了显着波浪高度（SWH）的三个现有参数化的缺陷，并在中等和高风（或年轻波）处高估SWH。总的来说，新的参数化与现有方案相比，在冬季风暴期间执行最佳。

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  • 来源
    《Oceanographic Literature Review》 |2020年第10期|2296-2297|共2页
  • 作者

    S. Lin; J. Sheng;

  • 作者单位

    Department of Oceanography Dalhousie University Halifax NS Canada;

    Department of Oceanography Dalhousie University Halifax NS Canada;

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