IOCAS-IR  > 海洋环流与波动重点实验室
Observed near-inertial waves in the wake of Typhoon Hagupit in the northern South China Sea
Yang Bing1,2,3; Hou Yijun1,2; Hu Po1,2
2015-09-01
Source PublicationCHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
Volume33Issue:5Pages:1265-1278
SubtypeArticle
AbstractEnergetic near-inertial internal waves (NIWs) were observed on the continental slope of the northern South China Sea in September 2008. Characteristics of the observed near-inertial waves were examined based on current data recorded by a moored acoustic Doppler current profiler. Results of a simple slab model indicated that the NIWs were generated by the surface winds of Typhoon Hagupit. Following Hagupit's passage, the wave field was dominated by baroclinic NIWs. The near-inertial currents were surface-intensified with a maximum of 0.52 m/s but still reached 0.1 m/s at the depth of 210 m. Moreover, the near-inertial currents were clockwise-polarized and slightly elliptical. A depth-leading phase of the near-inertial currents was evident, which indicated downward energy propagation. However, the rotary vertical wavenumber spectra suggested that upward energy propagation also existed, which was consistent previous theoretical study. The frequency of the NIWs, modified by the positive background vorticity, was 0.714 2 cycles per day, which was 0.02 f (0) higher than the local inertial frequency (f (0)). The near-inertial kinetic energy evolved exponentially and had an e-folding timescale of about 3 days. The vertical phase and group velocity were estimated to be 10 and 2.1 m/h, respectively, corresponding to a vertical wavelength of 340 m. The NIWs were dominated by the second mode with a variance contribution of > 50%, followed by the third mode, while the first mode was insignificant.
KeywordNear-inertial Internal Waves South China Sea Typhoon Hagupit
DOI10.1007/s00343-015-4254-z
Indexed BySCI
Language英语
WOS IDWOS:000360846900017
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Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/50636
Collection海洋环流与波动重点实验室
Affiliation1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
2.Chinese Acad Sci, Inst Oceanol, Ocean Circulat & Waves, Key Lab, Qingdao 266071, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Yang Bing,Hou Yijun,Hu Po. Observed near-inertial waves in the wake of Typhoon Hagupit in the northern South China Sea[J]. CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2015,33(5):1265-1278.
APA Yang Bing,Hou Yijun,&Hu Po.(2015).Observed near-inertial waves in the wake of Typhoon Hagupit in the northern South China Sea.CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,33(5),1265-1278.
MLA Yang Bing,et al."Observed near-inertial waves in the wake of Typhoon Hagupit in the northern South China Sea".CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY 33.5(2015):1265-1278.
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