Observations of enhanced nonlinear instability in the surface reflection of internal tides
[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; xdshang@scsio.ac.cn
2013
发表期刊GEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
卷号40期号:8页码:1580-1586
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.
部门归属LTO
关键词Internal Tides Parametric Subharmonic Instability Reflection Nonlinear Instability Mean Flow
学科领域Geosciences, Multidisciplinary
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. ; We thank Dongxiao Wang for the data used in this study. This work is supported by projects 2013CB430303, XDA10010104, U1033002 and 41276021. ; We thank Dongxiao Wang for the data used in this study. This work is supported by projects 2013CB430303, XDA10010104, U1033002 and 41276021. ; We thank Dongxiao Wang for the data used in this study. This work is supported by projects 2013CB430303, XDA10010104, U1033002 and 41276021.
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语种英语
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. ; We thank Dongxiao Wang for the data used in this study. This work is supported by projects 2013CB430303, XDA10010104, U1033002 and 41276021. ; We thank Dongxiao Wang for the data used in this study. This work is supported by projects 2013CB430303, XDA10010104, U1033002 and 41276021. ; We thank Dongxiao Wang for the data used in this study. This work is supported by projects 2013CB430303, XDA10010104, U1033002 and 41276021.
WOS记录号WOS:000319217800023
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被引频次:9[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/10916
专题热带海洋环境国家重点实验室(LTO)
通讯作者xdshang@scsio.ac.cn
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GB/T 7714
[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,et al. Observations of enhanced nonlinear instability in the surface reflection of internal tides[J]. GEOPHYSICAL RESEARCH LETTERS,2013,40(8):1580-1586.
APA [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,&xdshang@scsio.ac.cn.(2013).Observations of enhanced nonlinear instability in the surface reflection of internal tides.GEOPHYSICAL RESEARCH LETTERS,40(8),1580-1586.
MLA [Xie, Xiaohui,et al."Observations of enhanced nonlinear instability in the surface reflection of internal tides".GEOPHYSICAL RESEARCH LETTERS 40.8(2013):1580-1586.
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