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学科主题: Geosciences, Multidisciplinary
题名: Observations of enhanced nonlinear instability in the surface reflection of internal tides
作者: [Xie, Xiaohui ; Shang, Xiaodong ; Chen, Guiying] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China ; [van Haren, Hans] Royal Netherlands Inst Sea Res NIOZ, Den Burg, Netherlands
通讯作者: xdshang@scsio.ac.cn
关键词: internal tides ; parametric subharmonic instability ; reflection ; nonlinear instability ; mean flow
刊名: GEOPHYSICAL RESEARCH LETTERS
发表日期: 2013
卷: 40, 期:8, 页:1580-1586
部门归属: LTO
资助者: We thank Dongxiao Wang for the data used in this study. This work is supported by projects 2013CB430303, XDA10010104, U1033002 and 41276021.
摘要: Enhanced vertically standing waves formed by the superposition of two upward and downward going near-diurnal (D1) waves are observed during one semidiurnal (D2) spring tide in an approximately 75day long velocity record from the northeastern South China Sea. Bicoherence estimates suggest that the enhanced D1 waves are likely due to nonlinear parametric subharmonic instability of D2 internal tides. The timescale for energy growth by an order of magnitude is about 2.5days for these waves. In addition to subharmonics, higher harmonics D4 (=D2+D2) and a mean flow are generated by a different nonlinear interaction during the same D2 spring tide. The separation of coherent from incoherent internal tidal signals and a rotary spectral decomposition in the vertical direction reveal that D2 waves with opposite vertical propagation directions in the region of internal tide reflection from the surface may be responsible for the pronounced nonlinear instability.
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000319217800023
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10916
Appears in Collections:热带海洋环境国家重点实验室(LTO)_期刊论文

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[Xie, Xiaohui; Shang, Xiaodong; Chen, Guiying] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China; [van Haren, Hans] Royal Netherlands Inst Sea Res NIOZ, Den Burg, Netherlands.Observations of enhanced nonlinear instability in the surface reflection of internal tides,GEOPHYSICAL RESEARCH LETTERS,2013,40(8):1580-1586
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