南海北部冬季变浅内潮产生的第二模态内孤立波
Generation of second-mode internal solitary waves during the winter by a shoaling internal tide in the northern South China Sea
摘要：
Yang et al.（2009）报道了冬季在南海北部上大陆坡对第二模式内孤立波（模式-2 ISW）的现场测量结果，但其生成机制仍不清楚。我们研究了这个问题，多模态的演变模型和理论分析，这表明，所观察到的模式2 ISW所产生的浅滩模式2半日内潮（IT），从吕宋海峡。结果表明，两组模式2的ISW通常出现在一个半日潮周期内，先后骑在扩张和随后压缩的Pyceros线。波群的数量在很大程度上取决于IT的振幅;也就是说，较大的IT产生较大的模式2 ISW。此外，模间耦合占主导地位的模式-1 IT的演变，突出了考虑模式散射的传播中的低模式IT的重要性。
英文摘要：
Field measurements of second-mode internal solitary waves (mode-2 ISWs) during the winter on the upper continental slope of the northern South China Sea were reported in Yang et al. (2009), but their generation mechanism remains elusive. We investigated this issue with a multi-modal evolution model and theoretical analysis, which suggest that the observed mode-2 ISWs were generated by a shoaling mode-2 semidiurnal internal tide (IT) that emanated from the Luzon Strait. The results show that two groups of mode-2 ISWs usually appear within one semidiurnal tidal period, successively riding on expanded and subsequently compressed pycnoclines. The number of wave groups largely depends on the amplitudes of the ITs; that is, a larger IT produces larger mode-2 ISWs. Furthermore, intermodal coupling dominates the evolution of a mode-1 IT, highlighting the importance of considering mode scattering in the propagation of low-mode ITs.
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