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首页> 外文期刊>Journal of Physical Oceanography >Dynamics of an Abyssal Circulation Driven by Bottom-Intensified Mixing on Slopes
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Dynamics of an Abyssal Circulation Driven by Bottom-Intensified Mixing on Slopes

机译：斜坡上底部强化混合驱动的深层循环动力学

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The large-scale circulation of the abyssal ocean is enabled by small-scale diapycnal mixing, which observations suggest is strongly enhanced toward the ocean bottom, where the breaking of internal tides and lee waves is most vigorous. As discussed recently, bottom-intensified mixing induces a pattern of near-bottom up- and downwelling that is quite different from the traditionally assumed widespread upwelling. Here the consequences of bottom-intensified mixing for the horizontal circulation of the abyssal ocean are explored by considering planetary geostrophic dynamics in an idealized "bathtub geometry.'' Up- and downwelling layers develop on bottom slopes as expected, and these layers are well described by boundary layer theory. The basin-scale circulation is driven by flows in and out of these boundary layers at the base of the sloping topography, which creates primarily zonal currents in the interior and a net meridional exchange along western boundaries. The rate of the net overturning is controlled by the up- and downslope transports in boundary layers on slopes and can be predicted with boundary layer theory.
机译：深海的大规模环流是由小规模的斜向混合引起的，这表明向着海底强烈增强，海底的内潮和背风浪最猛烈。如最近所讨论的，底部强化混合引起了近底向上和向下上升的模式，这与传统上假定的广泛上升有很大不同。在这里，通过在理想的“浴缸几何形状”中考虑行星地转动力学，探索了底部强化混合对深海海洋水平循环的后果。上层和下层上升层如预期那样在底部斜坡上发育，并且对这些层进行了很好的描述根据边界层理论，盆地尺度的环流是由流入和流出倾斜地形底部的边界层驱动的，它主要在内部产生纬向流，并沿西部边界产生净子午线交换。净倾覆由边坡边界层中的上坡和下坡输送控制，可以用边界层理论预测。

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