Near-inertial waves in the wake of 2011 Typhoon Nesat in the northern South China Sea

doi:10.1007/s13131-014-0559-6

IOCAS-IR > 海洋环流与波动重点实验室

	Near-inertial waves in the wake of 2011 Typhoon Nesat in the northern South China Sea
	Yang Bing1,2,3 ; Hou Yijun 1,2; Hou, YJ (reprint author), Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China.
	2014-11-01
发表期刊	ACTA OCEANOLOGICA SINICA
卷号	33 期号:11 页码:102-111
文章类型	Article
摘要	In September 2011, Typhoon Nesat passed over a moored array of instruments recording current and temperature in the northern South China Sea (SCS). Awake of baroclinic near-inertial waves (NIWs) commenced after Nesat passed the array. The associated near-inertial currents are surface-intensified and clockwise-polarized. The vertical range of NIWs reached 300 m, where the vertical range is defined as the maximum depth of the horizontal near-inertial velocity 5 cm/s. The current oscillations have a frequency of 0.7099 cycles per day (cpd), which is 0.025f higher than the local inertial frequency. The NIWs have an e-folding time-scale of 10 d based on the evolution of the near-inertial kinetic energy. The depth-leading phase of near-inertial currents indicates downward group velocity and energy flux. The estimated vertical phase velocity and group velocity are 0.27 and 0.08 cm/s respectively, corresponding to a vertical wavelength of 329 m. A spectral analysis reveals that NIWs act as a crucial process to redistribute the energy injected by Typhoon Nesat. A normal mode and an empirical orthogonal function analysis indicate that the second mode has a dominant variance contribution of 81%, and the corresponding horizontal phase velocity and wavelength are 3.50 m/s and 420 km respectively. The remarkable large horizontal phase velocity is relevant to the rotation of the earth, and a quantitative analysis suggests that the phase velocity of the NIWs with a blue-shift of 0.025f overwhelms that of internal gravity waves by a factor of 4.6.
关键词	Near-inertial Waves South China Sea Typhoon Nesat
学科领域	Oceanography
DOI	10.1007/s13131-014-0559-6
收录类别	SCI
语种	英语
WOS记录号	WOS:000344583400010
引用统计	被引频次：31[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/23947
专题	海洋环流与波动重点实验室
通讯作者	Hou, YJ (reprint author), Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China.
作者单位	1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.Chinese Acad Sci Ocean Circulat & Waves, Inst Oceanol, Key Lab, Qingdao 266071, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
第一作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Yang Bing,Hou Yijun,Hou, YJ . Near-inertial waves in the wake of 2011 Typhoon Nesat in the northern South China Sea[J]. ACTA OCEANOLOGICA SINICA,2014,33(11):102-111.
APA	Yang Bing,Hou Yijun,&Hou, YJ .(2014).Near-inertial waves in the wake of 2011 Typhoon Nesat in the northern South China Sea.ACTA OCEANOLOGICA SINICA,33(11),102-111.
MLA	Yang Bing,et al."Near-inertial waves in the wake of 2011 Typhoon Nesat in the northern South China Sea".ACTA OCEANOLOGICA SINICA 33.11(2014):102-111.

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