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首页> 外文期刊>Journal of Physical Oceanography >Acceleration and Overturning of the Antarctic Slope Current by Winds, Eddies, and Tides
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Acceleration and Overturning of the Antarctic Slope Current by Winds, Eddies, and Tides

机译：风速，漩涡和潮汐加速和推翻南极斜坡电流

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All exchanges between the open ocean and the Antarctic continental shelf must cross the Antarctic Slope Current (ASC). Previous studies indicate that these exchanges are strongly influenced by mesoscale and tidal variability, yet the mechanisms responsible for setting the ASC's transport and structure have received relatively little attention. In this study the roles of winds, eddies, and tides in accelerating the ASC are investigated using a global ocean-sea ice simulation with very high resolution (1/48 degrees grid spacing). It is found that the circulation along the continental slope is accelerated both by surface stresses, ultimately sourced from the easterly winds, and by mesoscale eddy vorticity fluxes. At the continental shelf break, the ASC exhibits a narrow (similar to 30-50 km), swift (0.2 m s(-1)) jet, consistent with in situ observations. In this jet the surface stress is substantially reduced, and may even vanish or be directed eastward, because the ocean surface speed matches or exceeds that of the sea ice. The shelfbreak jet is shown to be accelerated by tidal momentum advection, consistent with the phenomenon of tidal rectification. Consequently, the shoreward Ekman transport vanishes and thus the mean overturning circulation that steepens the Antarctic Slope Front (ASF) is primarily due to tidal acceleration. These findings imply that the circulation and mean overturning of the ASC are not only determined by near-Antarctic winds, but also depend crucially on sea ice cover, regionally-dependent mesoscale eddy activity over the continental slope, and the amplitude of tidal flows across the continental shelf break.
机译：开放海洋和南极大陆架之间的所有交换都必须越过南极斜率电流（ASC）。以前的研究表明，这些交换受Messcale和潮汐变异的强烈影响，但负责设定ASC的运输和结构的机制受到相对较少的关注。在这研究中，使用具有非常高分辨率（1/48度网格间距）的全球海洋冰仿真研究了风，漩涡和潮汐加速ASC的作用。结果发现，沿着大陆坡度的循环通过表面应力，最终从复活风中源，并通过Mescle涡流旋转助熔剂来加速。在大陆架休息处，ASC表现出窄（类似于30-50 km），Swift（> 0.2米S（-1））喷射，与原位观察一致。在该射流中，表面应力显着降低，甚至可以消失或者以东地指导，因为海洋表面速度与海冰的匹配或超过那种。 Shelfbreak Jet被证明通过潮汐动量平流加速，与潮汐整流的现象一致。因此，施加着ekman运输消失，因此平均倾覆循环，其陡峭地倾斜南极斜率前部（ASF）主要是由于潮汐加速度。这些发现意味着ASC的循环和平均翻转不仅由近南极风决定，而且依赖于海冰覆盖，在大陆坡上的区域依赖的Messcale涡活动，以及潮汐流过的幅度大陆架休息。

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