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学科主题: Limnology; Oceanography
题名: Nonlinear interactions among internal tidal waves in the northeastern South China Sea
作者: Xie, XH ; Shang, XD ; Chen, GY
通讯作者: xdshang@scsio.ac.cn
关键词: South China Sea (SCS) ; internal waves ; nonlinearity ; rotary spectra ; bicoherence
刊名: CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
发表日期: 2010
卷: 28, 期:5, 页:996-1001
收录类别: sci
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
项目归属: LED
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.
原文出处: 查看原文
WOS记录号: WOS:000281711600007
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/6235
Appears in Collections:热带海洋环境动力实验室(LTO)_期刊论文

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Xie, XH; Shang, XD; Chen, GY.Nonlinear interactions among internal tidal waves in the northeastern South China Sea,CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2010,28(5):996-1001
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