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首页> 外文期刊>Journal of Physical Oceanography >Enhanced Diapycnal Diffusivity in Intrusive Regions of the Drake Passage
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Enhanced Diapycnal Diffusivity in Intrusive Regions of the Drake Passage

机译：在德雷克海峡侵入区增强的对流扩散

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摘要

Direct measurements of oceanic turbulent parameters were taken upstream of and across Drake Passage, in the region of the Subantarctic and Polar Fronts. Values of turbulent kinetic energy dissipation rate epsilon estimated by microstructure are up to two orders of magnitude lower than previously published estimates in the upper 1000 m. Turbulence levels in Drake Passage are systematically higher than values upstream, regardless of season. The dissipation of thermal variance chi is enhanced at middepth throughout the surveys, with the highest values found in northern Drake Passage, where water mass variability is the most pronounced. Using the density ratio, evidence for double-diffusive instability is presented. Subject to double-diffusive physics, the estimates of diffusivity using the Osborn-Cox method are larger than ensemble statistics based on epsilon and the buoyancy frequency.
机译：在南极和极地锋地区的德雷克海峡上游和跨海峡，直接测量了海洋湍流参数。通过微结构估计的湍动能耗散率ε的值比先前发表的关于上部1000 m的估计值低两个数量级。无论季节如何，德雷克海峡的湍流水平都系统地高于上游的水平。在整个调查过程中，中部深度的热方差chi的耗散都得到了增强，在北德雷克海峡中发现的最大值最高，那里的水质变化最明显。使用密度比，给出了双扩散不稳定性的证据。受双扩散物理影响，使用Osborn-Cox方法的扩散率估计值要比基于epsilon和浮力频率的整体统计值大。

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