冬季南海北部中尺度涡旋的数值研究
Numerical study about the mesoscale multi-eddy system in the northern South China Sea in winter
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摘要: 南海环流的一个主要特征是上层海洋环流具有多涡结构,海洋中尺度涡旋的演变(时间上的生消和空间上的迁移)是南海环流季节调整的可能方式。文中依据卫星遥感海面高度资料和实际海洋观测所揭示的南海北部存在中尺度涡旋体系的基本事实,采用一个改进了涡分辨(eddy-resolving)普林斯顿海洋模式(POM),对冬季处于强盛的东北季风强迫以及黑潮在巴士海峡入侵的共同作用下的南海北部环流的中尺度涡旋体系进行了数值研究,初步再现了冬季南海北部中尺度涡的生命史。计算结果表明,在实际的气候冬季风应力驱动下,具有的实际侧边界地形的南海北部呈现有强烈的中尺度涡旋。文中探讨了中尺度涡的垂直结构、温盐场的配置以及大尺度水平辐合辐散、海洋垂直运动与之相关的时空结构。由此可以得知,在冬季南海北部中尺度涡旋生命史的不同阶段,上述动力学因子的重要性是相对的。不同的敏感性试验表明,斜压调整是形成冬季南海中尺度涡旋体系的决定性因子;边界的入流和风应力驱动是影响中尺度涡旋运动的主要因素。Abstract: A numerical model is successfully used to simulate and analyze the multi-eddy system in the northern South China Sea in winter.The evoluation of multi-eddy system is affected by various factors:the baroclinic adjustment is the crucia[ one.Both the lateral boundary forcing and the realistic wind stress are important to the forming and maintaining of multi-eddy system.In order to illustrate the mechanism of evolution of the multi-eddy system,the vertical structures are analyzed in detail.The result of numerical modelling displays the dynamic evolution proeess of the multi-eddy system in tho northern South China Sea:an anticyclone appears with Kuroshio's intrusion in winter near the Bashi Strait; then it is advected by the large-scale circulation and goes forward to the west and the south,gradually splitting into an eddy array.With eneegy exchange with the background field,the anticyclone army disappears at the western boundary.It is indicated that the intrusion into the South China Sea of Kuroshio mainly appears in form of eddy.
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Key words:
- Mesoscale eddy /
- dynamic adjustment /
- northern South China Sea
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