Pathways of mesoscale variability in the South China Sea
Pathways of mesoscale variability in the South China Sea
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DOI：
10.1007/s00343-010-0035-x
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发表时间：
2010-09
影响因子：
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通讯作者：
W. Zhuang;Yan Du;Dongxiao Wang;Q. Xie;S. Xie
中科院分区：
文献类型：
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作者：
W. Zhuang;Yan Du;Dongxiao Wang;Q. Xie;S. Xie
利用卫星测高资料和涡旋分辨的全球海洋模式，采用最大互相关（MCC）方法，研究了南海海洋中尺度信号的传播。显著的中尺度信号沿沿着两个高变率的主要波段传播。北方带位于吕宋海峡以西，以西南向涡旋传播为特征。虽然涡旋在冬季最为活跃，但它们在水深测量的指引下向西南方向迁移，全年都在发生。平均流的平流在调节传播速度方面起次要作用。南涡带位于南海深盆的西南部，大致呈东西向。中尺度变率在秋季沿着带状向南传播。这种向南的涡旋路径不能用平均流平流来解释，可能与非线性效应导致的西边界流的涡旋偏折有关。我们的涡流传播速度的映射提供了重要的信息，为进一步了解在南海的涡流动力学。
The propagation of oceanic mesoscale signals in the South China Sea (SCS) is mapped from satellite altimetric observations and an eddy-resolving global ocean model by using the maximum cross-correlation (MCC) method. Significant mesoscale signals propagate along two major bands of high variability. The northern band is located west of the Luzon Strait, characterized by southwestward eddy propagation. Although eddies are the most active in winter, their southwestward migrations, steered by bathymetry, occur throughout the year. Advection by the mean flow plays a secondary role in modulating the propagating speed. The southern eddy band lies in the southwest part of the SCS deep basin and is oriented in an approximately meridional direction. Mesoscale variability propagates southward along the band in autumn. This southward eddy pathway could not be explained by mean flow advection and is likely related to eddy detachments from the western boundary current due to nonlinear effects. Our mapping of eddy propagation velocities provides important information for further understanding eddy dynamics in the SCS.