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A Locally Generated High-Mode Nonlinear Internal Wave Detected on the Shelf of the Northern South China Sea From Marine Seismic Observations
Tang, QS; Xu, M; Zheng, C; Xu, X; Xu, J; tqsh@scsio.ac.cn; mxu@scsio.ac.cn
2018
发表期刊JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
卷号123期号:2页码:1142-1155
摘要In this work, a secondary nonlinear internal wave (NIW) on the continental shelf of the northern South China Sea is investigated using high-resolution seismic imaging and joint inversion of water structure properties combined with in situ hydrographic observations. It is an extraordinary wave combination with two mode-2 NIWs and one elevated NIW occurring within a short distance of 2 km. The most energetic part of the NIW could be regarded as a mode-2 NIW in the upper layer between 40 and 120 m depth. The vertical particle velocity of approximate to 41 cm/s may exceed the critical value of wave breaking and thus collapse the strong stratification followed by a series of processes including internal wave breaking, overturning, Kelvin-Helmholtz instability, stratification splitting, and eventual restratification. Among these processes, the shear-induced Kelvin-Helmholtz instability is directly imaged using the seismic method for the first time. The stratification splitting and restratification show that the unstable stage lasts only for a few hours and spans several kilometers. It is a new observation that the elevated NIW could be generated in a deepwater region (as deep as approximate to 370 m). Different from the periodical NIWs originating from the Luzon Strait, this secondary NIW is most likely generated locally, at the continental shelf break during ebb tide.
部门归属[Tang, Qunshu; Xu, Min] South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China; [Zheng, Chan] South China Sea Inst Oceanol, Coll Math & Informat, Guangzhou, Guangdong, Peoples R China; [Xu, Xing] Guangzhou Marine Geol Survey, MLR Key Lab Marine Mineral Resources, Guangzhou, Guangdong, Peoples R China; [Xu, Jiang] Third Inst Oceanog, SOA Open Lab Ocean & Coast Geol, Xiamen, Peoples R China
学科领域Oceanography
关键词[WOS]internal solitary wave ; Kelvin-Helmholtz instability ; internal wave breaking ; seismic oceanography
资助项目MSG
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/17154
专题中科院边缘海地质重点实验室
通讯作者tqsh@scsio.ac.cn; mxu@scsio.ac.cn
推荐引用方式
GB/T 7714
Tang, QS,Xu, M,Zheng, C,et al. A Locally Generated High-Mode Nonlinear Internal Wave Detected on the Shelf of the Northern South China Sea From Marine Seismic Observations[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2018,123(2):1142-1155.
APA Tang, QS.,Xu, M.,Zheng, C.,Xu, X.,Xu, J.,...&mxu@scsio.ac.cn.(2018).A Locally Generated High-Mode Nonlinear Internal Wave Detected on the Shelf of the Northern South China Sea From Marine Seismic Observations.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,123(2),1142-1155.
MLA Tang, QS,et al."A Locally Generated High-Mode Nonlinear Internal Wave Detected on the Shelf of the Northern South China Sea From Marine Seismic Observations".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 123.2(2018):1142-1155.
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