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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Shear Flow Instabilities and Unstable Events Over the North Bay of Bengal
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Shear Flow Instabilities and Unstable Events Over the North Bay of Bengal

机译：孟加拉北湾的剪切流动量和不稳定事件

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摘要

A year-long mooring data are used to study the upper ocean unstable events and instabilities at 18 degrees N 89 degrees E, which is a climatologically important region in the North Bay of Bengal. Near-surface stability is studied from the context of the buoyancy frequency normalized shear (V-z/N) and reduced shear (S-2-4N(2)) which are convenient measures to quantify flow stability, compared to the more widely used Richardson number (Ri). The analysis is carried out across three contrasting time periods, the monsoon, postmonsoon, and the winter of year 2012. Although it is well known that the flow stability changes from stable to unstable at Ri=Ri(cr)=0.25, the relative importance of the perturbations of shear and buoyancy frequency in driving the unstable events is not well studied over the open oceans and more particularly over the Bay of Bengal. At 18 degrees N, 89 degrees E both higher than average shear and lower than average buoyancy frequency perturbations are crucial in driving the unstable events during the summer and premonsoon period. However, at increasing depths, the influence of shear perturbations becomes more dominant. Invoking the Miles-Howard criteria for flow instability, it is seen that during the postmonsoon period, the buoyancy frequency perturbations are more critical than shear perturbations in driving the unstable events. In winter, the unstable events are influenced by both the buoyancy frequency and shear perturbations.
机译：一年长的系泊数据用于在18摄氏度中研究上海不稳定的事件和稳定性，这是孟加拉北湾的气候上重要地区。从浮力频率归一化剪切（vz / n）的背景下研究了近表面稳定性，并减少了剪切（S-2-4n（2）），这是量化流量稳定性的方便，与更广泛使用的Richardson号相比（ri）。该分析是在三个染色时间段，季风，德蒙森和2012年冬季进行的分析。虽然众所周知，流动稳定性在Ri = Ri（Cr）= 0.25中从稳定变化到不稳定，但相对重要性在驾驶不稳定事件时，剪切和浮力频率的扰动尚不适用于开阔的海洋，更具体地说在孟加拉湾。在18度N值，89摄氏度高于平均剪切，低于平均浮力频率扰动对于在夏季和前大使期间驱动不稳定事件至关重要。然而，在增加深度时，剪切扰动的影响变得更加占主导地位。调用流量不稳定的里程 - 霍华德标准，看来在Postmonsoon期间，浮力频率扰动比驱动不稳定事件的剪切扰动更为关键。在冬季，不稳定事件受到浮力频率和剪切扰动的影响。

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