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A modeling study of the formation, maintenance, and relaxation of upwelling circulation on the Northeastern South China Sea shelf

机译：南海东北部陆架上升流形成，维持和松弛的模拟研究

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摘要

We investigated persistent summer upwelling circulation, in response to upwelling and downwelling favorable winds, in the Northeastern South China Sea (NSCS). We used a validated three-dimensional ocean circulation model that was forced by realistic atmospheric fluxes and downscaled coupling of real-time lateral fluxes. We found that upwelling in the NSCS was formed and maintained by the presence of an intensified westward along-isobath pressure gradient force (PGF(m)) and bottom frictional effect that led to cross-isobath currents over the unique NSCS widened shelf. The upwelling favorable PGF(m), and the frictional effect arose from the interaction between the eastward shelf current and the shelf topography. These intrinsic upwelling dynamics in the NSCS were largely sustained during episodic downwelling winds in the upwelling season because the retreat of the eastward shelf current from pre-existing upwelling was significantly slowed by the unique widened shelf topography. Furthermore, the upwelling dynamics could also be maintained and, even developed, during downwelling favorable winds, when the eastward shelf current was sustained by the pumping of downstream outflow. (C) 2014 Elsevier Ltd. All rights reserved.
机译：我们调查了南海东北部（NSCS）持续的夏季上升流环流，以响应上升和下降流的有利风。我们使用了经过验证的三维海洋环流模型，该模型是由实际的大气通量和实时横向通量的按比例缩小耦合所强迫的。我们发现，NSCS上升流的形成和维持是通过向西等静压梯度力（PGF（m））的向西增强和底部摩擦效应导致的，在独特的NSCS加宽层架上出现了横贯等温流。上升气流有利的PGF（m），以及摩擦作用是由东陆架流与陆架地形之间的相互作用引起的。 NSCS的这些固有上升动力在上升季节的偶发性下降气流中得到了很大的维持，因为独特的扩张架形地形显着减缓了原先上升流带来的东向陆架气流的后退。此外，当向下架有利风时，当通过向下游流出的水流维持东向陆架流时，也可以维持甚至形成向上的动力。 （C）2014 Elsevier Ltd.保留所有权利。

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