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首页> 外文期刊>Journal of Physical Oceanography >Wind-Driven Mixing below the Oceanic Mixed Layer
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Wind-Driven Mixing below the Oceanic Mixed Layer

机译：海洋混合层下的风动混合

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This study describes the turbulent processes in the upper ocean boundary layer forced by a constant surface stress in the absence of the Coriolis force using large-eddy simulation. The boundary layer that develops has a two-layer structure, a well-mixed layer above a stratified shear layer. The depth of the mixed layer is approximately constant, whereas the depth of the shear layer increases with time. The turbulent momentum flux varies approximately linearly from the surface to the base of the shear layer. There is a maximum in the production of turbulence through shear at the base of the mixed layer. The magnitude of the shear production increases with time. The increase is mainly a result of the increase in the turbulent momentum flux at the base of the mixed layer due to the increase in the depth of the boundary layer. The length scale for the shear turbulence is the boundary layer depth. A simple scaling is proposed for the magnitude of the shear production that depends on the surface forcing and the average mixed layer current. The scaling can be interpreted in terms of the divergence of a mean kinetic energy flux. A simple bulk model of the boundary layer is developed to obtain equations describing the variation of the mixed layer and boundary layer depths with time. The model shows that the rate at which the boundary layer deepens does not depend on the stratification of the thermocline. The bulk model shows that the variation in the mixed layer depth is small as long as the surface buoyancy flux is small.
机译：这项研究使用大涡模拟描述了在没有科里奥利力的情况下在恒定的表面应力作用下海洋上边界层的湍流过程。形成的边界层具有两层结构，即分层剪切层上方的充分混合层。混合层的深度近似恒定，而剪切层的深度随时间增加。湍动量通量从剪切层的表面到基底大约呈线性变化。在混合层的底部通过剪切产生的湍流最大。剪切力的大小随时间增加。该增加主要是由于边界层深度的增加而在混合层底部的湍动量通量增加的结果。剪切湍流的长度尺度是边界层深度。对于剪切产生的大小，提出了一种简单的缩放比例，该缩放比例取决于表面作用力和平均混合层电流。可以用平均动能通量的发散来解释换算。建立边界层的简单体模型以获得描述混合层和边界层深度随时间变化的方程。该模型表明边界层加深的速率不取决于温跃层的分层。本体模型表明，只要表面浮力通量较小，混合层深度的变化就较小。

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