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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：The three-dimensional process of internal solitary waves nonlinear steepen in the northern South China Sea is investigated by a nonhydrostatic ocean circulation model MITgcm.Model results suggest baroclinic tidal beams inspired by the interaction between barotropic tide and topography force intense perturbation in the western side of the Luzon Strait,then wave signals nonlinear steepen as they travel west,subsequently getting shorter wavelength and steeper waveform,finally forming large amplitude internal solitary waves at the shelf break in the northern South China Sea.Large amplitude solitary waves in the northern South China Sea are mainly developed from strong baroclinic perturbations in the western side of the Luzon Strait,rather than direct inspired strong fluctuations around Batan Island.Model results also successfully reproduce the evolution process of a-waves and b-waves.a-waves and b-waves are indistinctIn the western side of the Luzon Strait(approximately at the of 120°E),but they are obviously distinct after nonlinear steepen in the west travelling,which suggest the propagation is meaningful for forming a-waves and b-waves.
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基本信息:
DOI：10.16441/j.cnki.hdxb.20160367
中图分类号:P731.24
引用信息:
[1]张哲恩,陈学恩.南海北部内孤立波非线性陡斜的数值研究[J],2017,47(11):1-8.DOI:10.16441/j.cnki.hdxb.20160367.
基金信息:
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~~
2016-10-28
2016
2017-08-28
2017
2016-12-08
1