A Locally Generated High-Mode Nonlinear Internal Wave Detected on the Shelf of the Northern South China Sea From Marine Seismic Observations

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 中科院边缘海地质重点实验室

	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
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
	2018
卷号	123 期号:2 页码:1142-1155
英文摘要	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.
学科主题	Oceanography
资助项目	MSG
WOS关键词	internal solitary wave ; Kelvin-Helmholtz instability ; internal wave breaking ; seismic oceanography
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/17154]
专题	南海海洋研究所_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.