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首页> 外文期刊>Journal of Physical Oceanography >Stirring by Small-Scale Vortices Caused by Patchy Mixing
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Stirring by Small-Scale Vortices Caused by Patchy Mixing

机译：斑片混合引起的小规模涡旋搅动

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摘要

Evidence is presented that lateral dispersion on scales of 1-10 km in the stratified waters of the continental shelf may be significantly enhanced by stirring by small-scale geostrophic motions caused by patches of mixed fluid adjusting in the aftermath of diapycnal mixing events. Dye-release experiments conducted during the recent Coastal Mixing and Optics (CMO) experiment provide estimates of diapycnal and lateral dispersion. Microstructure observations made during these experiments showed patchy turbulence on vertical scales of 1-10 m and horizontal scales of a few hundred meters to a few kilometers. Momentum scaling and a simple random walk formulation were used to estimate the effective lateral dispersion caused by motions resulting from lateral adjustment following episodic mixing events. It is predicted that lateral dispersion is largest when the scale of mixed patches is on the order of the internal Rossby radius of deformation, which seems to have been the case for CMO. For parameter values relevant to CMO, lower-bound estimates of the effective lateral diffusivity by this mechanism ranged from 0.1 to 1 m~2 s~(-1). Revised estimates after accounting for the possibility of long-lived motions were an order of magnitude larger and ranged from 1 to 10 m~2 s~(-1). The predicted dispersion is large enough to explain the observed lateral dispersion in all four CMO dye-release experiments examined.
机译：有证据表明，在洋底混合事件发生后，由于混合流体斑块的调整引起的小规模地转运动的搅动，可以大大增强大陆架分层水域中1-10 km尺度上的横向弥散。在最近的海岸混合与光学（CMO）实验过程中进行的染料释放实验提供了对辉石和横向扩散的估计。在这些实验中进行的微观结构观察显示，垂直尺度为1-10 m，水平尺度为几百米至几千米，有片状湍流。动量缩放和简单的随机游走公式用于估计由偶发混合事件后的横向调整所引起的运动引起的有效横向分散。据预测，当混合斑块的尺寸在内部Rossby变形半径的数量级上时，横向弥散最大，这似乎是CMO的情况。对于与CMO有关的参数值，通过该机制进行的有效横向扩散率的下界估计范围为0.1到1 m〜2 s〜（-1）。在考虑了长寿命运动的可能性后，修订后的估计值要大一个数量级，范围从1到10 m〜2 s〜（-1）。预测的色散足够大，足以解释在所检查的所有四个CMO染料释放实验中观察到的横向色散。

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