What do we need to Probe Upper Ocean Stratification Remotely?
What do we need to Probe Upper Ocean Stratification Remotely?
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远程探测上层海洋层结需要什么？
DOI：
10.1007/s11141-020-10030-2
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发表时间：
2020
影响因子：
0.8
通讯作者：
Shrira V
中科院分区：
文献类型：
--
作者：
Shrira V
我们考虑原则上是否有可能使用理论模型来检索上层海洋混合层的关键参数（其厚度、整体涡动粘度和下面的密度跃层分层），该模型假设表面速度和风应力是已知的从观察。为此，我们研究的Ekman电流的动力学在新的两层模型的上层海洋的两层有很大不同的恒定涡粘度。分层的存在通过湍流的抑制而表现出来，因此，与混合层中的体积涡动粘度ve1相比，涡动粘度的值要小得多。在这个两层模型的绿色函数的一般解决方案已被导出和分析。发现当混合层深度d小于或等于Ekman尺度（其中f是科里奥利参数）时，表面上Ekman流的频率ω的频谱分量“感觉”到分层层的存在。因此，在强风导致大涡动粘度ve1的条件下，混合层的深度（原则上）可以从风和表面速度的观测中推断出来。我们得出结论，指出检索混合层参数的风和表面速度数据，理论模型必须扩展到考虑到斯托克斯漂移由于表面波和混合层底部的强烈混合的可能性的影响。
We consider whether it is possible in principle to retrieve the key parameters of the mixed layer in the upper ocean (its thickness, bulk eddy viscosity and the pycnocline stratification below) using a theoretical model, which assumes the surface velocity and wind stress to be known from observations. To this end we examine the dynamics of the Ekman current in the novel two-layer model of the upper ocean made of two layers with greatly differing constant eddy viscosities. The presence of stratification manifests itself through suppression of turbulence and, hence, in much smaller value of the eddy viscosity compared to the bulk eddy viscosity ve1in the mixed layer. Within this two-layer model the general solution in terms of Green’s function has been derived and analyzed. It was found that a spectral component of frequency ω of the Ekman current on the surface “feels” the presence of the stratified layer when the mixed layer depth d is less then or comparable to the Ekman scale, where f is the Coriolis parameter. Thus, under conditions of strong wind resulting in large eddy viscosity ve1, the depth of the mixed layer could be (in principle) inferred from the observations of wind and surface velocity. We conclude by stating that to retrieve the mixed layer parameters from the wind and surface velocity data, the theoretical model has to be extended by taking into account the effects of the Stokes drift due to surface waves and the possibility of intense mixing at the bottom of the mixed layer.
用于海洋表面流和海况遥感的 VHF 雷达
DOI：
--
发表时间：
1987
期刊：
影响因子：
--
作者：
P. Broche;P. Forget;J. D. Maistre;J. Devenon;M. Crochet
通讯作者：
M. Crochet
上层海洋埃克曼电流动态：新视角
影响因子：
3.7
作者：
Shrira V
通讯作者：
Shrira V