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首页> 外文期刊>Journal of Physical Oceanography >Observed Variations in Turbulent Mixing Efficiency in the Deep Ocean
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Observed Variations in Turbulent Mixing Efficiency in the Deep Ocean

机译：深海湍流混合效率的观测变化

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摘要

Recent progress in direct numerical simulations (DNSs) of stratified turbulent flows has led to increasing attention to the validity of the constancy of the dissipation flux coefficient in the Osborn's eddy diffusivity model. Motivated by lack of observational estimates of , particularly under weakly stratified deep-ocean conditions, this study estimates using deep microstructure profiles collected in various regions of the North Pacific and Southern Oceans. It is shown that is not constant but varies significantly with the Ozmidov/Thorpe scale ratio R-OT in a fashion similar to that obtained by previous DNS studies. Efficient mixing events with similar to O(1) and R-OT similar to O(0.1) tend to be frequently observed in the deep ocean (i.e., weak stratification), while moderate mixing events with similar to O(0.1) and R-OT similar to O(1) tend to be observed in the upper ocean (i.e., strong stratification). The observed negative relationship between and R-OT is consistent with a simple scaling "JPO-D-17-0275.1 that can be derived from classical turbulence theories. In contrast, the observed results exhibit no definite relationships between and the buoyancy Reynolds number Re-b, although Re-b has long been thought to be another key parameter that controls Gamma.
机译：分层湍流的直接数值模拟（DNS）的最新进展已引起人们对Osborn涡流扩散模型中耗散通量系数恒定性有效性的关注。由于缺乏观察性的估计，尤其是在弱分层深海条件下，本研究使用在北太平洋和南大洋各地区收集的深部微观结构剖面进行了估计。结果表明，该常数不是恒定的，而是随着Ozmidov / Thorpe比例R-OT的变化而变化，其方式类似于以前的DNS研究。在深海中经常观察到与O（1）和R-OT与O（0.1）类似的有效混合事件（即弱分层），而与O（0.1）和R-OT类似的中等混合事件通常被观察到类似于O（1）的OT倾向于在上层海洋中观测到（即强分层）。与R-OT之间的负关系与“ JPO-D-17-0275.1”的简单比例一致，可以从经典湍流理论中得出。相反，观察到的结果与雷诺数Re-和浮力Re-之间没有确定的关系。 b，尽管长期以来人们一直认为Re-b是控制Gamma的另一个关键参数。

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