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Modeling Equilibrium Dynamics of the Benguela Current System

机译：Benguela电流系统的平衡动力学建模

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The Regional Ocean Modeling System (ROMS) is used to systematically investigate equilibrium conditions and seasonal variations of the Benguela system at a resolution of 9 km, including both the large-scale offshore flow regime and the economically and ecologically important coastal upwelling regime. A shelf-edge pole-ward flow exists in the northern Benguela region (i.e., north of ～28°S) and is driven primarily by the wind stress curl via the Sverdrup relation. As such, it is strongly seasonal and is most intense during spring and summer, when the wind stress curl is most negative. The poleward flow deepens as it moves southward; between ～25° and 27°S, much of it veers offshore because of the nature of the wind stress curl and its interaction with the northwestward path of the Benguela Current, which is influenced by alongshore topographical variations. The Benguela Current is driven by nonlinear interactions of passing Agulhas rings and eddies and does not have a striking seasonal signal. In the mean state, it is characterized by two streams. The more inshore stream is topographically controlled and follows the run of the shelf edge. The meandering nature of the offshore stream is a result of the preferential path of Agulhas rings. The model simulates all seven of the major upwelling cells within its domain. The three southernmost cells have the strongest seasonal signal and experience their greatest upwelling during spring and summer months, whereas the two northernmost cells have less seasonal variability but nevertheless have increased upwelling from autumn to spring (and least upwelling in summer), and the central Benguela upwelling cells experience year-round upwelling. The effect of topography on coastal upwelling was investigated by smoothing alongshore coastline and topography variations, which showed that, in all of the seven major upwelling cells, upwelling is enhanced on the downstream side of capes.
机译：区域海洋模型系统（ROMS）用于以9 km的分辨率系统地研究本格拉系统的平衡条件和季节变化，包括大规模的近海流态和具有经济和生态意义的沿海上升流态。在本格拉北部地区（即〜28°S以北）存在着一个台架边缘极向流，它主要是通过Sverdrup关系受风应力卷曲驱动的。因此，这是强烈的季节变化，在春季和夏季是最强烈的季节，此时风应力卷曲最不利。向南流动时，极点水流加深。在〜25°至27°S之间，由于风应力卷曲的性质以及它与本格拉流向西北的路径的相互作用而受到海底地形变化的影响，其中大部分转向海上。本格拉水流是由经过的Agulhas环和涡流的非线性相互作用驱动的，没有明显的季节性信号。在平均状态下，它具有两个流的特征。较近岸的河流受到地形的控制，并遵循架子边缘的走向。海上水流的曲折性质是Agulhas环的优先路径的结果。该模型模拟了其域内的所有七个主要上升流单元。三个最南端的单元格具有最强的季节性信号，并且在春季和夏季月份经历了最大的上升流，而两个最北端的单元格的季节变异性较小，但是从秋季到春季（夏季最不活跃）的上升流都增加了，而本格拉中部上升细胞经历全年的上升。通过平滑沿海海岸线和地形变化研究了地形对沿海上升流的影响，结果表明，在所有七个主要上升流单元中，海角下游的上升流都得到了增强。

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  • 来源
    《Journal of Physical Oceanography》 |2010年第9期|P.1942-1964|共23页
  • 作者

    Jennifer Veitch; Pierrick Penven; Frank Shillington;

  • 作者单位

    Department of Oceanography, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa;

    rnLaboratoire de Physique des Oceans (UMR 6523 CNRS, IFREMER, IRD, UBO), Brest, France;

    rnDepartment of Oceanography, University of Cape Town, Rondebosch, South Africa;

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