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首页> 外文期刊>Journal of Physical Oceanography >Modeling Study of Variable Upwelling Circulation in the East China Sea: Response to a Coastal Promontory
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Modeling Study of Variable Upwelling Circulation in the East China Sea: Response to a Coastal Promontory

机译：东海可变上升流环流的模拟研究：对沿海海角的响应

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摘要

A three-dimensional, high-resolution numerical model is used to investigate processes and dynamics of an intensified upwelling that is induced by a coastal promontory over the East China Sea (ECS) shelf. The center of the intensified upwelling around the promontory has been constantly observed, but, so far, it has been dynamically unexplained. Forced by an idealized southeasterly wind stress, the model results well capture the observed upwelling at the lee of the coastal promontory. The intensified upwelling is formed by a strengthened shoreward transport downstream of the promontory as the upwelling jet veers shoreward. The jet is mainly controlled by a cross-shore geostrophic balance and is largely modulated by both centrifugal acceleration associated with nonlinear advection and by bottom stress. The strengthened shoreward transport is mainly attributed to the cross-shore geostrophic current that is induced by a countercurrent (negative) pressure gradient force (PGF) and partly attributed to the bottom Ekman transport. Based on the analyses of the momentum balance and depth-integrated vorticity dynamics, the authors provide a new explanation for the origin of negative PGF. It is found that the countercurrent PGF is generated by negative bottom stress curl and strengthened by negative vorticity advection downstream of the promontory. While the negative bottom stress curl arises from bottom shear vorticity, the source of negative advection downstream of the promontory is the negative shear vorticity on the seaside of the shoreward-bent jet. Nevertheless, cyclonic curvature vorticity at the bottom and positive vorticity advection in the water column at the promontory weakens the negative PGF. Although nonlinear advection strengthens vorticity advection, it weakens bottom stress curl and has little net effect on the countercurrent PGF.
机译：使用三维高分辨率的数值模型研究东海（ECS）陆架沿海海角引起的加剧上升流的过程和动力学。海角周围不断上升的上升流的中心一直被观察到，但是到目前为止，它一直是动态无法解释的。在理想的东南风应力的作用下，该模型的结果很好地记录了在沿海海角背风处观测到的上升流。上升的上升流是由于上升的射流转向岸上而在海角下游的加强的向岸运输所形成的。射流主要由跨岸地转平衡控制，并主要受到与非线性平流有关的离心加速度和底部应力的调节。加强的向岸输运主要归因于逆流（负）压力梯度力（PGF）引起的跨岸地转流，部分归因于底部埃克曼输运。在对动量平衡和深度积分涡度动力学进行分析的基础上，作者为负PGF的起源提供了新的解释。发现逆流的PGF是由负的底部应力卷曲产生的，并由海角下游的负涡度对流增强。虽然负的底部应力卷曲是由底部的剪切涡度引起的，但海角下游的负对流的来源是向岸弯曲射流海边的负剪切涡度。然而，底部的气旋曲率涡度和海角水柱中的正涡度对流减弱了负PGF。尽管非线性对流增强了涡流对流，但它减弱了底部应力的卷曲，并且对逆流PGF的净影响很小。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第4期|1078-1094|共17页
  • 作者

    Zhiqiang Liu; Jianping Gan;

  • 作者单位

    Department of Mathematics and Division of Environment, Hong Kong University of Science and Technology, Hong Kong, China;

    Department of Mathematics and Division of Environment, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China;

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