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首页> 外文期刊>Journal of Physical Oceanography >Abyssal Upwelling and Downwelling Driven by Near-Boundary Mixing
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Abyssal Upwelling and Downwelling Driven by Near-Boundary Mixing

机译：近边界混合驱动的深渊上升流和下降流

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摘要

A buoyancy and volume budget analysis of bottom-intensified mixing in the abyssal ocean reveals simple expressions for the strong upwelling in very thin continental boundary layers and the interior near-boundary downwelling in the stratified ocean interior. For a given amount of Antarctic Bottom Water that is upwelled through neutral density surfaces in the abyssal ocean ( between 2000 and 5000m), up to 5 times this volume flux is upwelled in narrow, turbulent, sloping bottom boundary layers, while up to 4 times the net upward volume transport of Bottom Water flows downward across isopycnals in the near-boundary stratified ocean interior. These ratios are a direct result of a buoyancy budget with respect to buoyancy surfaces, and these ratios are calculated from knowledge of the stratification in the abyss along with the assumed e-folding height that characterizes the decrease of the magnitude of the turbulent diapycnal buoyancy flux away from the seafloor. These strong diapycnal upward and downward volume transports are confined to a few hundred kilometers of the continental boundaries, with no appreciable diapycnal motion in the bulk of the interior ocean.
机译：对深海中底部强化混合的浮力和体积预算分析显示了非常薄的大陆边界层中的强上升流和分层海洋内部中的近边界下降流的简单表达。对于给定数量的南极海底水（通过2000-5000m之间的深海中性密度表面向上涌流），该体积通量的最高5倍在狭窄，湍流，倾斜的底部边界层中上升，而最高为4倍。在近边界分层海洋内部，底水的净向上体积输运向下流过等渗物。这些比率是相对于浮力表面的浮力预算的直接结果，并且这些比率是根据对深渊中的分层的了解以及假定的电子折叠高度（表示湍流的双向浮力通量的减小而表征的）计算得出的远离海底。这些强健的向上和向下的体积运输被限制在数百公里的大陆边界内，在整个内部海洋中没有明显的径向运动。

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