Impact of Surface Waves on the Steady Near-Surface Wind Profiles over the Ocean
Impact of Surface Waves on the Steady Near-Surface Wind Profiles over the Ocean
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DOI：
10.1007/s10546-014-9983-6
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发表时间：
2015-04
影响因子：
4.3
通讯作者：
Jinbao Song;W. Fan;Shuang Li;Mingyu Zhou
中科院分区：
文献类型：
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作者：
Jinbao Song;W. Fan;Shuang Li;Mingyu Zhou
基于Ekman理论，通过在总应力上引入波生分量进行修正，研究了海面波对海洋大气边界层定常近地面风廓线的影响。给出了涡粘性系数随高度线性变化的波浪修正Ekman模型的解析解。解可以由海浪的二维波数谱、波的增长或衰减率、地转风速、科里奥利参数以及空气和水的密度来确定。以两种情况为例计算了风廓线：一种是单色波，另一种是充分发展的风生海面。给出了表面波对海洋ABL风廓线的影响，并与忽略波浪应力的模型结果进行了比较。这些解决方案还与波罗的海奥斯特加恩肖姆岛上的一座塔楼上的观测结果进行了比较。算例和观测与理论预报的比较表明，表面波不仅对近地面平均风廓线有相当大的影响，而且对海洋大气边界层的湍流结构也有相当大的影响，因为它们定性地改变了海洋边界层的结构。
The impacts of surface waves on the steady near-surface wind profiles in the marine atmospheric boundary layer (ABL) are studied based on the Ekman theory, modified by introducing a wave-induced component on the total stress. An analytic solution is presented for the wave-modified Ekman model for an eddy viscosity coefficient varying linearly with height. The solution can be determined by the two-dimensional wavenumber spectrum of ocean waves, the wave-growth or decay rate, the geostrophic wind velocity, the Coriolis parameter and the densities of air and water. Wind profiles are calculated as examples for two cases: one with a monochromatic wave and the other with a fully-developed wind-generated sea. The effects of the surface waves on the wind profiles in the marine ABL are illustrated, and solutions proposed are compared with those of the model where the wave-induced stress is neglected. The solutions are also compared with observations from a tower on Östergarnsholm Island in the Baltic Sea. Illustrative examples and the comparisons between observations and the theoretical predictions demonstrate that the surface waves have a considerable impact, not only on the near-surface mean wind profile, but also on the turbulence structure of the marine ABL, as they change qualitatively the structure of the ABL.