DOI: 10.1002/2017JC013347
Scopus记录号: 2-s2.0-85041498006
论文题名: A Locally Generated High-Mode Nonlinear Internal Wave Detected on the Shelf of the Northern South China Sea From Marine Seismic Observations
作者: Tang Q. ; Xu M. ; Zheng C. ; Xu X. ; Xu J.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 2 起始页码: 1142
结束页码: 1155
语种: 英语
英文关键词: internal solitary wave
; internal wave breaking
; Kelvin-Helmholtz instability
; seismic oceanography
Scopus关键词: continental shelf
; detection method
; internal wave
; Kelvin-Helmholtz instability
; nonlinear wave
; seismic method
; shelf sea
; solitary wave
; stratification
; wave breaking
; wave generation
; Luzon Strait
; Pacific Ocean
; South China Sea
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 ∼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 ∼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. © 2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114577
Appears in Collections: 气候减缓与适应
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作者单位: CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Guangzhou, China; College of Mathematics and Informatics, South China Agricultural University, Guangzhou, China; MLR Key Laboratory of Marine Mineral Resources, Guangzhou Marine Geological Survey, Guangzhou, China; SOA Open Laboratory of Ocean and Coast Geology, Third Institute of Oceanography, Xiamen, China
Recommended Citation:
Tang Q.,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,2018-01-01,123(2)