An analysis of the current deflection around Dongsha Islands in the northern South China Sea
An analysis of the current deflection around Dongsha Islands in the northern South China Sea
复制标题
南海北部东沙群岛周围海流偏转分析
DOI：
10.1029/2012jc008429
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发表时间：
2013
影响因子：
3.6
通讯作者：
Hong, Bo
中科院分区：
文献类型：
--
作者：
Zhou, Weidong;Cai, Shuqun;Li, Li;Hong, Bo
根据现场资料和秋季ADCP观测资料，发现南海北部大陆架上存在一股中流向东北方向流。这股水流几乎沿着等深线流动，当它流过东沙群岛时，它从等深线转向深水。气候水文资料（WOA01）和绝对动力地形资料（ADT）得到的地理流证实了NSCS大陆上的东北偏流。利用一个能很好地再现NSCS大尺度环流的精细分辨率区域海洋模式分析了偏转的动力。涡度项平衡表明，斜压和起伏的联合效应（JEBAR）驱动水柱偏离等深线。在东沙群岛以东，等深线与等深线几乎是正交的。地形和斜压效应的共同作用提供负涡度，促使水柱从等深线偏转，转向较深的水域。沿流线动量分析表明，海水在东沙群岛周围流动时，沿等深线的压力梯度推动海水加速，然后与等深线正交的科里奥利力增大并克服了相应的压力梯度，促使海水从等深线偏向深海。引用本文：王丹，王庆，周文伟，蔡树生，李亮，洪斌（2013），南海北部东沙群岛附近洋流偏转分析[j] .地球物理学报。海洋学报，18 (1),490-501,doi:10.1029/2012JC008429。
Based on the in situ data and ADCP observation in fall, it is found that a northeastward current at inter-middle level flows on the Northern South China Sea (NSCS) continental shelf. This current flows almost along the isobaths, and it deflects from the isobaths veering toward deep water when flowing over the Dongsha Islands. Geographic currents derived from the climatologic hydrography data (WOA01) and absolute dynamic topography (ADT) data confirm the deflection of the northeastward current on NSCS continent. A fine resolution regional ocean model which can well reproduce the large scale circulation in the NSCS is used to analyze the dynamic about the deflection. The vorticity term balances shows that JEBAR (Joint Effect of Baroclinicity and Relief) drives the water column to depart from the isobaths. To the east of the Dongsha Islands, the isopycnal is almost orthogonal to the isobaths. The joint effect of the topographic and the baroclinic effect supplies negative vorticity and drives the water column to deflect from the isobaths and veer to deeper water. Momentum analysis along the stream line shows that, when the sea water flows around the Dongsha islands, the pressure gradient along the isobath pushes the sea water to accelerate, and then the Coriolis force orthogonal to the isobath increases and overcomes the corresponding pressure gradient, which drives the water deflected from the isobath toward the deep sea. Citation: Wang, D., Q. Wang, W. Zhou, S. Cai, L. Li, and B. Hong (2013), An analysis of the current deflection around Dongsha Islands in the northern South China Sea, J. Geophys. Res. Oceans, 118, 490-501, doi:10.1029/2012JC008429.
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影响因子：
2.3
作者：
Guanghong Liao;Yaochu Yuan;Xiaohua Xu
通讯作者：
Guanghong Liao;Yaochu Yuan;Xiaohua Xu
影响因子：
2.3
作者：
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通讯作者：
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影响因子：
1.3
作者：
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通讯作者：
W. R. Holland
DOI：
10.1016/0278-4343(94)00056-s
发表时间：
1995
期刊：
--
影响因子：
--
作者：
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通讯作者：
Changsheng Chen;R. Beardsley;Richard Limeburnert
影响因子：
2.3
作者：
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