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首页> 外文期刊>Journal of Physical Oceanography >Energetics of Bottom Ekman Layers during Buoyancy Arrest
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Energetics of Bottom Ekman Layers during Buoyancy Arrest

机译：浮力逮捕过程中底部埃克曼层的能量学

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Turbulent bottom Ekman layers are among the most important energy conversion sites in the ocean. Their energetics are notoriously complex, in particular near sloping topography, where the feedback between cross-slope Ekman transports, buoyancy forcing, and mixing affects the energy budget in ways that are not well understood. Here, the authors attempt to clarify the energy pathways and different routes to mixing, using a combined theoretical and modeling approach. The analysis is based on a newly developed energy flux diagram for turbulent Ekman layers near sloping topography that allows for an exact definition of the different energy reservoirs and energy pathways. Using a second-moment turbulence model, it is shown that mixing efficiencies increase for increasing slope angle and interior stratification, but do not exceed the threshold of 5% except for very steep slopes, where the canonical value of 20% may be reached. Available potential energy generated by cross-slope advection may equal up to 70% of the energy lost to dissipation for upwelling-favorable flow, and up to 40% for downwelling-favorable flow.
机译：湍流的底部埃克曼层是海洋中最重要的能量转换场所。它们的能量学非常复杂，尤其是在倾斜的地形附近，在这种情况下，跨坡Ekman输运，浮力强迫和混合之间的反馈会以一种人们不太了解的方式影响能量收支。在这里，作者尝试使用组合的理论和建模方法来阐明能量途径和混合的不同途径。该分析基于新开发的针对倾斜地形附近湍流Ekman层的能量通量图，该图可精确定义不同的储能器和能量路径。使用第二阶湍流模型，表明混合效率随坡度角和内部分层的增加而增加，但除非常陡峭的坡度（标准值可达到20％）外，不超过5％的阈值。横坡对流产生的可用势能最多等于向上流有利流的耗散能量损失的70％，而向下流有利流高达40％的能量损失。

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