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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Structure and downstream evolution of the Agulhas Current system during a quasi-synoptic survey in February–March 2003
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Structure and downstream evolution of the Agulhas Current system during a quasi-synoptic survey in February–March 2003

机译：2003年2月至3月的准天气调查中Agulhas Current系统的结构和下游演化

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摘要

The Agulhas Undercurrent Experiment took place in February—March 2003 off the east coast of South Africa and consisted of four sections of hydrographic and velocity data across the Agulhas Current between 30 and 36°S and connecting offshore sections that formed three closed boxes. An inverse model was applied to the quasi-synoptic data, and results show that the net mass transport at the historical 32°S section had a considerably higher transport of 100 + 9 Sv than earlier estimates. This high transport falls within the peak-to-peak variability obtained previously from a current meter time series. Several mesoscale cyclonic eddies extending down to intermediate depths were sampled during the survey; in particular, a strong, locally formed shear edge eddy was found inshore of the Agulhas Current at 36°S. Offshore eddies were found to drive considerable onshore-offshore fluxes, resulting in highly variable Agulhas transports from one section to another. After attempting to account for and remove the influence of these eddies on the Agulhas transport, the downstream growth of the Agulhas Current is found to be consistent with the Sverdrup transport variation, within errors. To account for the total magnitude of the Agulhas transport, fluxes from both the Indonesian Throughflow and Indian Ocean overturning must also be taken into account. There is no clear evidence from this study for a significant contribution of inertial recirculation to the Agulhas within this latitude range.
机译：Agulhas暗流实验于2003年2月至2003年3月在南非东海岸附近进行，由横跨30至36°S的Agulhas洋流的水文和速度数据的四个部分组成，并连接形成三个封闭箱的近海部分。将一个反模型应用于准天气数据，结果表明，历史32°S截面的净质量输运比先前的估计值高出100 + 9 Sv。这种高传输率落在先前从电流表时间序列中获得的峰峰值变化范围内。在调查期间采样了几个中尺度的旋风涡旋，涡旋涡旋延伸到中间深度。特别是在36°S的阿古拉斯海流沿岸发现了一个强烈的局部剪切边缘涡流。人们发现，近海涡流驱动着相当多的近海-近海通量，从而导致Agulhas从一个区域到另一个区域的变化很大。尝试考虑并消除了这些涡流对Agulhas输运的影响后，发现Agulhas Current的下游增长与Sverdrup输运变化一致，但有误差。要考虑到Agulhas运输的总规模，还必须考虑印度尼西亚通流和印度洋倾覆的通量。这项研究没有明确的证据表明在这个纬度范围内惯性再循环对Agulhas的重要贡献。

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