IOCAS-IR  > 海洋环流与波动重点实验室
Observation of Near-Inertial Waves Induced by Typhoon Mitag (2019) on the Southwestern East China Sea Continental Slope
Ouyang, Zhiling1,2,3; Liu, Ze1,3,4,5; Sun, Yunfei6; Yang, Bing1,2,3,4; Hou, Yijun1,2,3,4
2022-02-01
Source PublicationJOURNAL OF MARINE SCIENCE AND ENGINEERING
Volume10Issue:2Pages:25
Corresponding AuthorHou, Yijun(yjhou@qdio.ac.cn)
AbstractBased on horizontal velocity data recorded by a moored acoustic Doppler current profiler (ADCP) deployed on the southwestern continental slope of the East China Sea (ECS), this study investigates the characteristics of near-inertial waves (NIWs) induced by typhoon Mitag in October 2019. The results indicated that Mitag-induced near-inertial kinetic energy (NIKE) was mainly concentrated above 290 m and was subsurface-intensified; both the maximum velocity and kinetic energy of the NIWs occurred at a depth of 100 m and were 0.21 m/s and 23.01 J/m(3), respectively. The rotary vertical wavenumber spectra suggested that both downward and upward energy propagation existed. However, upward energy propagation was much smaller than downward energy propagation, mainly in the 0.007-0.014 cpm wavenumber band. The NIWs had an e-folding timescale of 9.5 days and were red-shifted as a result of the Doppler shift of the Kuroshio. Normal mode analysis suggested that the NIWs were dominated by the first and fourth baroclinic modes, which together accounted for 76.7% of the total NIKE. Spectral analysis showed that although the spectral density of the semidiurnal internal tide (M-2) peak overwhelmed that of the NIWs by a factor of approximately 30, the shear strength generated by the NIWs was comparable to that of the semidiurnal internal tide (M-2), which plays an important role in upper ocean mixing on the southwestern continental slope of the ECS. In addition, the bicoherence analysis suggested that a harmonic wave (M-2-f) was generated via the nonlinear interaction between the NIWs and semidiurnal internal tide (M-2), which reflects the energy dissipation mechanism of semidiurnal tides and NIWs on the southwestern continental slope of the ECS.
Keywordnear-inertial waves typhoon Mitag East China Sea in situ observation normal mode
DOI10.3390/jmse10020202
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41630967] ; National Natural Science Foundation of China[41776020] ; National Natural Science Foundation of China[42076002] ; [NORC2020-02]
WOS Research AreaEngineering ; Oceanography
WOS SubjectEngineering, Marine ; Engineering, Ocean ; Oceanography
WOS IDWOS:000765521400001
PublisherMDPI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/178195
Collection海洋环流与波动重点实验室
Corresponding AuthorHou, Yijun
Affiliation1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China
4.Qingdao Natl Lab Marine Sci & Technol, Lab Ocean & Climate Dynam, Qingdao 266237, Peoples R China
5.Harbin Engn Univ, Qingdao Innovat & Dev Base, Qingdao 266404, Peoples R China
6.Qingdao Univ, Assets & Lab Management Off, Qingdao 266071, Peoples R China
First Author AffilicationKey Laboratory of Ocean Circulation and Wave Studies, Institute of Oceanology, Chinese Academy of Sciences
Corresponding Author AffilicationKey Laboratory of Ocean Circulation and Wave Studies, Institute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Ouyang, Zhiling,Liu, Ze,Sun, Yunfei,et al. Observation of Near-Inertial Waves Induced by Typhoon Mitag (2019) on the Southwestern East China Sea Continental Slope[J]. JOURNAL OF MARINE SCIENCE AND ENGINEERING,2022,10(2):25.
APA Ouyang, Zhiling,Liu, Ze,Sun, Yunfei,Yang, Bing,&Hou, Yijun.(2022).Observation of Near-Inertial Waves Induced by Typhoon Mitag (2019) on the Southwestern East China Sea Continental Slope.JOURNAL OF MARINE SCIENCE AND ENGINEERING,10(2),25.
MLA Ouyang, Zhiling,et al."Observation of Near-Inertial Waves Induced by Typhoon Mitag (2019) on the Southwestern East China Sea Continental Slope".JOURNAL OF MARINE SCIENCE AND ENGINEERING 10.2(2022):25.
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