南海北部内孤立波非线性陡斜的数值研究

发布时间：2018-07-27 19:09

【摘要】：基于三维海洋环流模式MITgcm,对非线性陡斜在南海北部内孤立波形成和传播过程中的作用进行了研究,探讨了内孤立波的三维演变过程。研究发现,吕宋海峡处正压潮流激发的斜压潮能射线在其西侧形成强斜压扰动,该扰动在西传过程中受到地形浅化的影响,发生非线性陡斜,波长变小,波形变陡,最终在南海北部陆架坡折处形成大振幅内孤立波,即南海北部的大振幅内孤立波主要是由吕宋海峡西侧的强斜压扰动发展而来,而非来自吕宋海峡巴坦岛附近经潮地相互作用所形成的强波动信号。同时,模式也揭示了a、b波的演变过程,在吕宋海峡西侧约120°E以东的海域,没有发现a、b波,经过西传过程中的非线性陡斜作用,a、b波才演变出来,表明传播过程在a、b波的形成中具有重要意义。
[Abstract]:Based on the three-dimensional ocean circulation model Mitg cm, the role of nonlinear steep slope in the formation and propagation of solitary waves in the northern part of the South China Sea is studied, and the three-dimensional evolution process of the internal solitary waves is discussed. It is found that baroclinic tidal energy rays excited by barotropic tidal current in the Luzon Strait form a strong baroclinic disturbance in the west of Luzon Strait. The disturbance is affected by topography shallowness during the westward propagation, resulting in a nonlinear steep slope, a smaller wavelength and a steeper waveform. Finally, a large amplitude internal solitary wave is formed at the break of the continental shelf slope in the northern part of the South China Sea, that is, the large amplitude internal solitary wave in the northern part of the South China Sea is mainly developed from the strong baroclinic disturbance on the west side of the Luzon Strait. It is not a strong wave signal formed by the interaction of the meridional land near Batan Island in the Luzon Strait. At the same time, the model also reveals the evolution process of Asab wave. In the sea area about 120 掳E east of Luzon Strait, there is no Asab wave, but it evolves only after the nonlinear steep oblique action in the westward propagation process. It is shown that the propagation process is of great significance in the formation of a B wave.
【作者单位】：中国海洋大学海洋与大气学院;
【基金】：国家自然科学基金项目“南海内波的生成、传播及其三维性(41276008)” 泰山学者计划项目资助~~
【分类号】：P731.24

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