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首页> 外文期刊>Journal of Physical Oceanography >Observations of Eddy-Modulated Turbulent Mixing in the Southern Bay of Bengal
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Observations of Eddy-Modulated Turbulent Mixing in the Southern Bay of Bengal

机译：孟加拉南湾涡流湍流混合的观察

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摘要

Long-term measurements of turbulent kinetic energy dissipation rate (epsilon), and turbulent temperature variance dissipation rate (chi(T)) in the thermocline, along with currents, temperature, and salinity were made at two subsurface moorings in the southern Bay of Bengal (BoB). This is a part of a major international program, conducted between July 2018 and June 2019, for investigating the role of the BoB on the monsoon intraseasonal oscillations. One mooring was located on the typical path of the Southwest Monsoon Current (SMC), and the other was in a region where the Sri Lanka dome is typically found during the summer monsoon. Microstructure and finescale estimates of vertical diffusivity revealed the long-term subthermocline mixing patterns in the southern BoB. Enhanced turbulence and large eddy diffusivities were observed within the SMC during the passage of a subsurface-intensified anticyclonic eddy. During this time, background shear and strain appeared to influence high-frequency motions such as near-inertial waves and internal tides, leading to increased mixing. Near the Sri Lanka dome, enhanced dissipation occurred at the margins of the cyclonic feature. Turbulent mixing was enhanced with the passage of Rossby waves and eddies. During these events, values of chi(T) exceeding 10(-4) degrees C-2 s(-1) were recorded concurrently with epsilon values exceeding 10(-5) W kg(-1). Inferred diffusivity peaked well above background values of 10(-6) m(2) s(-1), leading to an annually averaged diffusivity near 10(-4) m(2) s(-1). Turbulence appeared low throughout much of the deployment period. Most of the mixing occurred in spurts during isolated events.
机译：湍流动能耗散速率（ε），以及热割机中的湍流温度方差耗散速率（湍流温度方差耗散速率（Chi（t））以及在孟加拉南部湾的两个地下停泊处制作了电流，温度和盐度（鲍勃）。这是2018年7月至2019年6月至2019年6月至2019年6月至2019年6月的主要国际计划的一部分，用于调查鲍勃对季风陷入困境振荡的作用。一个系泊位于西南季风电流（SMC）的典型路径上，另一个位于夏季季风通常在斯里兰卡圆顶的一个地区。垂直扩散率的微观结构和FineScale估计揭示了南部鲍勃中的长期临床热线混合模式。在地下强化的反型反型涡流的通过期间，在SMC内观察到增强的湍流和大型涡流扩散性。在此期间，背景剪切和菌株似乎影响诸如近惯性波和内部潮汐的高频运动，导致混合增加。靠近斯里兰卡圆顶，在旋风特征的边缘发生增强的耗散。随着Rossby波和漩涡的通过，增强了湍流混合。在这些事件期间，与超过10（-5）W kg（-1）的epsilon值同时记录超过10（-4）℃（-1）的CHI（t）的值。推断扩散率达到良好高于10（-6）m（2）S（-1）的背景值，导致在10（-4）m（2）S（-1）附近的每年平均扩散率。在大部分部署期间，湍流出现了很低。大多数混合在隔离事件期间发生在喷射中。

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