| 南海环流的一个约化模式 |
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| 引用本文： | 刘先炳,苏纪兰.南海环流的一个约化模式[J].海洋与湖沼,1992,23(2):167-174. |
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| 作者姓名： | 刘先炳 苏纪兰 |
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| 作者单位： | 国家海洋局第二海洋研究所，国家海洋局第二海洋研究所 杭州 310012，杭州 310012 |
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| 摘 要： | 利用约化数值模式研究了黑潮在巴士海峡的流况及受其影响的南海海盆区的环流,结果为:定常的黑潮入流在巴士海峡不易出现显著的环状流动结构,但在海峡西侧诱生一气旋涡,该涡旋达到一定强度时,β因子和侧边界作用使其向西南移动,因此,模式给出的南海环流呈准半年周期的气旋涡现象。动力分析表明,气旋涡因非线性平流作用将黑潮西侧的气旋性切变涡度向南海北部输送所致。模式同时计算了入流方向和流轴位置呈周期性变化时,巴士海峡和南海的流动结构。
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| 关 键 词： | 南海 环流 黑潮 约化模式 |
A REDUCED GRAVITY MODEL OF THE CIRCULATION IN THE SOUTH CHINA SEA |
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| Liu Xianbing and Su Jilan.A REDUCED GRAVITY MODEL OF THE CIRCULATION IN THE SOUTH CHINA SEA[J].Oceanologia Et Limnologia Sinica,1992,23(2):167-174. |
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| Authors: | Liu Xianbing and Su Jilan |
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| Abstract: | A reduced gravity numerical model is adopted to study the circulation in the South China Sea and in Bashi Strait. Numerical experiments and the dynamical analyses show that (1) for the steady state inflow condition there is an insignificant loop current in the Bashi Strait like that in the Gulf of Mexico. This is probably due to the narrow outport and inport distance and the unfavourable northward inertia. A cyclonic eddy is induced periodicaly by Kuroshio across the strait in the northern part of SCS. As the eddy becomes strengthed, it moves sou-thwestward along the west boundary and finally dissipated in the southwest corner of the model domain. Thus the current system in SCS has a quasi-semi-annual period. The cyclonic eddies are formed by the advection of the positive vorticity west of the main stream of the Kuroshio, while the southwestward movement of these eddies is induced by both the bbbbbbbbbbbbbbbbbbb factor and the interaction between the eddies and lateral boundary. (2) A persistent southwestward current exists adjacent to the northwestern boundary of the model domain. Its position is consistent with that appeared in a barotropic model, and its average volume transport is comparable to that obtained by dynamical computations. The current has its origin west of the Kuroshio main stream near the center of Bashi Strait, and it is actually a recirculation of the cyclonic eddies. However, because of its mixing with Kuroshio water in Bashi Strait we can expect the water in the current will have some characteristics of the Kurosio water. (3) Further studies are needed to confirm the model result. |
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| Keywords: | South China Sea Kuroshio South China Sea Circulation Reduced gravity model Cyclonic eddy |
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