Mechanism of internal waves in the Luzon Strait
Mechanism of internal waves in the Luzon Strait
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DOI：
10.1029/2005jc003198
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发表时间：
2006-11
影响因子：
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通讯作者：
Yeli Yuan;Q. Zheng;Dejun Dai;Xiaomin Hu;F. Qiao;J. Meng
中科院分区：
文献类型：
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作者：
Yeli Yuan;Q. Zheng;Dejun Dai;Xiaomin Hu;F. Qiao;J. Meng
[1]本研究提出了海洋内波的一种西边界流不稳定产生机制。建立了描述这种不稳定性的线性模型，并从零阶复频率-波数关系中得到了解析解。该关系的实部表示所产生的内波的色散关系，而虚部表示指数增长率。色散关系用来描述波的传播特性，而增长率则用来描述不稳定性。理论结果被应用于吕宋海峡以东黑潮的情况。通过分析发现，对于向西传播的扰动，黑潮西翼是不稳定的，而东翼是稳定的，而对于向东传播的扰动，则相反。这些结果被用于解译吕宋海峡产生并向西传播的海洋内波的卫星SAR图像。通过对吕宋海峡以东黑潮的尺度分析，得出了黑潮增长率和传播速度的合理估计值。
[1] This study suggests a western boundary current instability generation mechanism for the ocean internal waves. A linear model describing this instability is developed, and an analytical solution is derived from a zero-order complex frequency–wavenumber relation. The real part of the relation represents a dispersion relation of the generated internal waves, and the imaginary part is an exponential growth rate. The dispersion relation describes the wave propagation characteristics, while the growth rate represents the instability properties. The theoretical results are used for the case of the Kuroshio east of the Luzon Strait. Based on the analysis, it is found that for the westward propagating disturbance, the Kuroshio west wing is unstable and the east wing is stable; while the reverse is true for the eastern propagating disturbance. The results are used to interpret satellite SAR images of the ocean internal waves, which were generated in the Luzon Strait and propagated westward. Reasonable estimates for the growth rate and propagation velocity are derived from a scale analysis of the Kuroshio east of the Luzon Strait.