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首页> 外文期刊>Journal of Physical Oceanography >Vertical Vorticity Balance in Meanders Downstream the Agulhas Retroflection
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Vertical Vorticity Balance in Meanders Downstream the Agulhas Retroflection

机译：Agulhas逆流下游曲流的垂直涡旋平衡

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摘要

The Agulhas Current flows poleward along the western boundary of the southeastern Indian Ocean where, at the southernmost latitude of the African continent, it executes a dramatic anticyclonic turn, or retroflection, to the east. Since 1978, a large number of drifting buoys have passed through this eastward-flowing Agulhas Return Current (ARC), or the zonal frontal boundary between subtropical and subpolar waters of the south Indian Ocean. The spatial distribution of the ensemble-averaged near-surface velocity along the ARC axis reveals a series of steady-state meanders of 700-km wavelength and amplitudes that decrease from 170 km in the first meander to 50 km in the following four meanders. Here an analysis of vorticity balance of the meandering ARC speed axis is presented that demonstrates a balance between the β term and advection of curvature vorticity. This balance implies that the ARC axis, or frontal region, is horizontally nondivergent in agreement with the other observations of flow in the surface layers of near-zonal oceanic fronts.
机译：Agulhas洋流沿印度洋东南部的西部边界向两极流动，在非洲大陆的最南端，它向东执行了剧烈的反气旋转折或逆转。自1978年以来，大量漂流浮标已通过该向东流动的阿古拉斯回水流（ARC），即南印度洋副热带和亚极水域之间的地带锋面边界。沿ARC轴的集合平均近地速度的空间分布揭示了一系列700 km波长的稳态曲折，振幅从第一个曲折的170 km减小到随后的四个曲折的50 km。在此，对弯曲的ARC速度轴的涡旋平衡进行了分析，该分析证明了β项和曲率涡旋平流之间的平衡。这种平衡意味着ARC轴或额叶区域在水平方向上没有发散，这与近地带海洋锋面表层中流动的其他观测结果一致。

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