Nonlinear interactions among internal tidal waves in the northeastern South China Sea
Xie, XH; Shang, XD; Chen, GY; xdshang@scsio.ac.cn
2010
发表期刊CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
ISSN0254-4059
卷号28期号:5页码:996-1001
摘要We used a set of 75-day long ADCP data from the northeastern South China Sea (SCS) to investigate nonlinear interactions among freely propagating internal tidal waves. The kinetic energy spectra displayed significant peaks at some higher tidal frequencies, such as O1M2 (O-1+M-2), and M-4 (M-2+M-2), where O-1 is the lunar diurnal internal tide, M-2 is the lunar semidiurnal internal tide, and M-4 is the first higher harmonic frequency of M-2. These higher tidal harmonic frequency peaks, as well as the fundamental tidal harmonic peaks, show a sigma (-2.3) spectral falloff rate with frequency. In addition, we explored the possible generation mechanism of higher tidal harmonics. Analysis on the rotary and bicoherence spectra suggests that strong forced non-resonant interaction induced by nonlinear advections was the dominant physical mechanism that induced these higher tidal harmonics. Moreover, the energetic, freely propagating semidiurnal (M-2) internal tidal wave played the most crucial role in these interactions. These results indicate that strong nonlinear forced non-resonant interactions among internal tides can be one of the processes responsible for the redistribution of energy in the internal wave spectrum.
部门归属[Xie Xiaohui; Shang Xiaodong; Chen Guiying] Chinese Acad Sci, Key Lab Trop Marine Environm Dynam, Marine Observat & Res Lab, S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; [Xie Xiaohui] Chinese Acad Sci, Grad Univ, Beijing 100080, Peoples R China
关键词South China Sea (Scs) Internal Waves Nonlinearity Rotary Spectra Bicoherence
学科领域Limnology ; Oceanography
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收录类别sci
资助项目LED
WOS记录号WOS:000281711600007
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文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/6235
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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Xie, XH,Shang, XD,Chen, GY,et al. Nonlinear interactions among internal tidal waves in the northeastern South China Sea[J]. CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2010,28(5):996-1001.
APA Xie, XH,Shang, XD,Chen, GY,&xdshang@scsio.ac.cn.(2010).Nonlinear interactions among internal tidal waves in the northeastern South China Sea.CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,28(5),996-1001.
MLA Xie, XH,et al."Nonlinear interactions among internal tidal waves in the northeastern South China Sea".CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY 28.5(2010):996-1001.
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