气候变化领域集成服务门户(CCPortal): Observed Internal Tides and Near-Inertial Waves in the Northern South China Sea: Intensified f-Band Energy Induced by Parametric Subharmonic Instability

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DOI	10.1029/2020JC016324
	Observed Internal Tides and Near-Inertial Waves in the Northern South China Sea: Intensified f-Band Energy Induced by Parametric Subharmonic Instability
	Shen J.; Fang W.; Zhang S.; Qiu Y.; Zhang J.; Xie X.
发表日期	2020
ISSN	21699275
卷号	125 期号:10
英文摘要	The variations in the internal tide (IT) and near-inertial waves (NIWs) that occurred in the summer of 2006 over the continental shelf of the northern South China Sea were observed using three bottom-mounted moorings equipped with acoustic Doppler current profilers. Due to the strong nonlinear interaction, large portions (~40–60%) of the semidiurnal IT energy at the continental shelf were found to be incoherent; this proportion gradually increased from the shelf break to the offshore region. More importantly, our observations showed that parametric subharmonic instability (PSI) can enhance the f-band energy in the shallow water (~100 m) on the continental shelf. Using plane-wave fitting and the bicoherence spectrum, we confirmed that the intensified NIWs and the observed D2-f waves are nonlinear coupled waves derived from the semidiurnal internal tidal PSI. These two subharmonic waves were observed in the near field of a strong semidiurnal IT generation site at the shelf break. By tracking the M2-ray path, we verified that the PSI occurred in the pycnocline in the path of the reflected wave beam that was characterized by strong nonlinear instabilities and it could be modulated by mesoscale eddies in this shallow shelf water. ©2020. The Authors.
英文关键词	internal tide; mesoscale eddy; near-inertial wave; northern South China Sea; parametric subharmonic instability
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186624
作者单位	Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, China; State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China; Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai, China; State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, China
推荐引用方式 GB/T 7714	Shen J.,Fang W.,Zhang S.,et al. Observed Internal Tides and Near-Inertial Waves in the Northern South China Sea: Intensified f-Band Energy Induced by Parametric Subharmonic Instability[J],2020,125(10).
APA	Shen J.,Fang W.,Zhang S.,Qiu Y.,Zhang J.,&Xie X..(2020).Observed Internal Tides and Near-Inertial Waves in the Northern South China Sea: Intensified f-Band Energy Induced by Parametric Subharmonic Instability.Journal of Geophysical Research: Oceans,125(10).
MLA	Shen J.,et al."Observed Internal Tides and Near-Inertial Waves in the Northern South China Sea: Intensified f-Band Energy Induced by Parametric Subharmonic Instability".Journal of Geophysical Research: Oceans 125.10(2020).