Observed near-inertial waves and shears east of Luzon during Typhoons Mangkhut and Yutu in 2018

doi:10.1016/j.dsr2.2022.105185

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋环流与波动重点实验室

	Observed near-inertial waves and shears east of Luzon during Typhoons Mangkhut and Yutu in 2018
	Cao, Mai 1,2; Wang, Qingye 1,2,3,4
刊名	DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
	2022-11-01
卷号	205 页码:16
关键词	Near-inertial waves Shear Typhoon Philippines Luzon
ISSN号	0967-0645
DOI	10.1016/j.dsr2.2022.105185
通讯作者	Wang, Qingye(wangqy@qdio.ac.cn)
英文摘要	Based on acoustic Doppler current profiler observations from three moorings along the 18 degrees N latitude line east of Luzon (at 122.7 degrees E, 123 degrees E, and 123.3 degrees E), the characteristics, vertical propagation, modes, and shear properties of the near-inertial waves (NIWs) induced by Typhoon Mangkhut and Typhoon Yutu in 2018 were investigated. Energetic NIW events were generated that dominated ocean currents after the passage of the typhoons. The wavenumber-frequency spectra and downward/upward current decomposition demonstrated that the near -inertial currents rotated clockwise and mainly propagated downward energy in the Northern Hemisphere. The estimated phase velocities and vertical wavelengths were 4.9-9.4 m/h and 155-376 m, respectively. The NIWs at the three moorings showed red-shifted frequencies in the upper ocean but blue-shifted frequencies in the deep ocean, which were affected by background vorticity. Vertical mode analysis showed that the near-inertial kinetic energy (NIKE) was dominated by the third, fourth, and fifth higher modes above 400 m and by the first, second, and third lower modes below 400 m. The translation speeds of Typhoons Mangkhut (29 km/h) and Yutu (24 km/ h) exceeded the critical value (14.4 km/h). Since the intensity of NIWs decreases with an increase in typhoon translation speed, the maximum NIKE caused by Typhoon Yutu was higher than that caused by Typhoon Mangkhut because of the lower translation speed of Typhoon Yutu. However, the NIKE caused by Typhoon Mangkhut propagated vertically into a deeper layer than that caused by Typhoon Yutu. The strong anticyclonic eddy near the moorings during the period of Typhoon Mangkhut played a more important role in the vertical propagation of NIKE than the weaker anticyclonic eddy during the period of Typhoon Yutu. This study shows the significant contribution of NIWs to shear. NIW-induced near-inertial shear was significantly enhanced after the two typhoons passed, with contributions of more than 50%. Although NIW-induced shear appeared to be stronger during the typhoons, no strong shear instabilities or turbulent mixing were observed.
资助项目	National Key Research and Development Program of China ; National Natural Science Foundation of China ; [2017YFA0604102] ; [41976011]
WOS研究方向	Oceanography
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000873921700001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/180572]
专题	海洋研究所_海洋环流与波动重点实验室
通讯作者	Wang, Qingye
作者单位	1.Chinese Acad Sci, Key Lab Ocean Circulat & Waves, Inst Oceanol, Qingdao 266071, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Pilot Natl Lab Marine Sci & Technol Qingdao, Lab Ocean & Climate Dynam, Qingdao 266237, Peoples R China 4.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao, Peoples R China
推荐引用方式 GB/T 7714	Cao, Mai,Wang, Qingye. Observed near-inertial waves and shears east of Luzon during Typhoons Mangkhut and Yutu in 2018[J]. DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY,2022,205:16.
APA	Cao, Mai,&Wang, Qingye.(2022).Observed near-inertial waves and shears east of Luzon during Typhoons Mangkhut and Yutu in 2018.DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY,205,16.
MLA	Cao, Mai,et al."Observed near-inertial waves and shears east of Luzon during Typhoons Mangkhut and Yutu in 2018".DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY 205(2022):16.