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首页> 外文期刊>Journal of Physical Oceanography >Symmetric and Geostrophic Instabilities in the Wave-Forced Ocean Mixed Layer
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Symmetric and Geostrophic Instabilities in the Wave-Forced Ocean Mixed Layer

机译：波浪强迫海洋混合层的对称性和地转不稳定性

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Here, the effects of surface waves on submesoscale instabilities are studied through analytical and linear analyses as well as nonlinear large-eddy simulations of the wave-averaged Boussinesq equations. The wave averaging yields a surface-intensified current (Stokes drift) that advects momentum, adds to the total Coriolis force, and induces a Stokes shear force. The Stokes-Coriolis force alters the geostrophically balanced flow by reducing the burden on the Eulerian-Coriolis force to prop up the front, thereby potentially inciting an anti-Stokes Eulerian shear, while maintaining the Lagrangian (Eulerian plus Stokes) shear. Since the Lagrangian shear is maintained, the Charney-Stern-Pedlosky criteria for quasigeostrophic (QG) baroclinic instability are unchanged with the appropriate Lagrangian interpretation of the shear and QG potential vorticity. While the Stokes drift does not directly affect vorticity, the anti-Stokes Eulerian shear contributes to the Ertel potential vorticity (PV). When the Stokes shear and geostrophic shear are aligned (antialigned), the PV is more (less) cyclonic. If the Stokes-modified PV is anticyclonic, the flow is unstable to symmetric instabilities (SI). Stokes drift also weakly impacts SI through the Stokes shear force. When the Stokes and Eulerian shears are the same (opposite) sign, the Stokes shear force does positive (negative) work on the flow associated with SI. Stokes drift also allows SI to extract more potential energy from the front, providing an indirect mechanism for Stokes-induced restratification.
机译：在此，通过分析和线性分析以及平均波型Boussinesq方程的非线性大涡模拟，研究了表面波对亚中尺度不稳定性的影响。波平均产生表面增强的电流（斯托克斯漂移），该电流使动量平流，增加了科里奥利力的总和，并诱发了斯托克斯剪切力。 Stokes-Coriolis力通过减少Eulerian-Coriolis力支撑前部的负担来改变地层平衡流动，从而有可能煽动反Stokes的Eulerian剪切力，同时保持拉格朗日（Eulerian加Stokes）剪切力。由于保持了拉格朗日剪切力，因此通过适当的拉格朗日解释对剪切力和QG的潜在涡度，拟地转（QG）斜压不稳定性的Charney-Stern-Pedlosky标准不变。尽管斯托克斯漂移不会直接影响涡度，但反斯托克斯欧拉剪切作用会导致Ertel势涡（PV）。当斯托克斯剪切力和地转剪切力对齐（反对齐）时，PV旋风越多（越少）。如果Stokes改性的PV是反气旋的，则流量不稳定，对称不稳定（SI）。斯托克斯漂移还通过斯托克斯剪切力对SI产生了微弱的影响。当斯托克斯剪切力和欧拉剪切力相同（相反）时，斯托克斯剪切力对与SI相关的流动产生正（负）作用。斯托克斯漂移还允许SI从前方提取更多势能，从而为斯托克斯诱导的重新定殖提供了间接机制。

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