Downward Propagation and Trapping of Near-Inertial Waves by a Westward-Moving Anticyclonic Eddy in the Subtropical Northwestern Pacific Ocean

doi:10.1175/JPO-D-22-0226.1

IOCAS-IR > 海洋环流与波动重点实验室

	Downward Propagation and Trapping of Near-Inertial Waves by a Westward-Moving Anticyclonic Eddy in the Subtropical Northwestern Pacific Ocean
	Chen, Zifei1 ; Yu, Fei 1,2,3; Chen, Zhiwu 4; Wang, Jianfeng 1,2,3; Nan, Feng 1,2,3; Ren, Qiang1,2 ; Hu, Yibo 1,5; Cao, Anzhou 6; Zheng, Tongtong 1,5
	2023-09-01
发表期刊	JOURNAL OF PHYSICAL OCEANOGRAPHY
ISSN	0022-3670
卷号	53 期号:9 页码:2105-2120
通讯作者	Yu, Fei(yuf@qdio.ac.cn) ; Chen, Zhiwu(zhiwuchen@scsio.ac.cn)
摘要	Mesoscale eddies can alter the propagation of wind-generated near-inertial waves (NIWs). Different from previous studies, the subsurface mooring observed NIWs are generated outside an anticyclonic eddy (ACE) and then inter-act with the arriving ACE. It is found that with the arrival of the ACE, the NIWs accelerate to propagate downward and the maximum vertical wavelength and group velocity of NIWs reach -500 m and -35 m day21, respectively. When enter-ing the core of the ACE, the near-inertial energy is trapped and finally stalls at a critical depth, which basically corresponds to the base of the ACE located at around 750-m depth. Through a ray-tracing model and dynamic analyses, this critical depth is much deeper than that of NIWs generated directly inside an ACE. By using depth-time varying stratification and relative vorticity, ray-tracing experiments further demonstrate that NIWs generated outside and passed over by an ACE can propagate to deep depths. Furthermore, energy budget analyses indicate that the net energy transfer from the ACE to NIWs plays an important role in the enhancement of downward-propagating near-inertial energy and its long-term persis-tence (-45 days) in the critical layer. Within the critical layer, the enhancement of shear instability and nonlinear interac-tions among internal waves account for the loss of the trapped near-inertial energy and provide energy for furnishing deep ocean mixing.SIGNIFICANCE STATEMENT: The interactions between near-inertial waves and a westward-moving anticyclonic eddy are investigated in this study. Knowledge about the propagation of near-inertial waves continues to be a topic of interest because near-inertial waves transfer energy from the mixed layer to the interior ocean, which is an important source of turbulent mixing. While much is known about how near-inertial energy propagates inside an anticyclonic eddy, few studies have examined how near-inertial energy propagates when it is generated outside an anticyclonic eddy and then enters the arriving anticyclonic eddy. In this study, the deep propagation and trapping of near-inertial energy by a westward-moving anticyclonic eddy is observed, which contributes greatly to the energy budget and the deep-ocean mixing.
关键词	Eddies Inertia-gravity waves Mixing Hurricanes/typhoons
DOI	10.1175/JPO-D-22-0226.1
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program of China[2022YFB3205305] ; National Key Research and Development Program of China[LTO2307] ; State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences[42176025] ; National Natural Science Foundation of China[ZR2023QD077] ; Natural Science Foundation of Shandong Province[QDBSH20220201032] ; Qingdao Municipal Bureau of Human Resources and Social Security ; [2022YFC3104105]
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:001059994000001
出版者	AMER METEOROLOGICAL SOC
WOS关键词	INTERNAL WAVES ; TURBULENT DISSIPATION ; ENERGY-TRANSFER ; KINETIC-ENERGY ; NORTH PACIFIC ; WIND ; SHEAR ; MESOSCALE ; CIRCULATION ; CURRENTS
引用统计	被引频次：2[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/337002/182928
专题	海洋环流与波动重点实验室
通讯作者	Yu, Fei; Chen, Zhiwu
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 2.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao, Peoples R China 3.Pilot Natl Lab Marine Sci & Technol Qingdao, Qingdao, Peoples R China 4.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Peoples R China 5.Univ Chinese Acad Sci, Beijing, Peoples R China 6.Zhejiang Univ, Ocean Coll, Zhoushan, Peoples R China
第一作者单位	海洋环流与波动重点实验室
通讯作者单位	海洋环流与波动重点实验室; 中国科学院海洋研究所
推荐引用方式 GB/T 7714	Chen, Zifei,Yu, Fei,Chen, Zhiwu,et al. Downward Propagation and Trapping of Near-Inertial Waves by a Westward-Moving Anticyclonic Eddy in the Subtropical Northwestern Pacific Ocean[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2023,53(9):2105-2120.
APA	Chen, Zifei.,Yu, Fei.,Chen, Zhiwu.,Wang, Jianfeng.,Nan, Feng.,...&Zheng, Tongtong.(2023).Downward Propagation and Trapping of Near-Inertial Waves by a Westward-Moving Anticyclonic Eddy in the Subtropical Northwestern Pacific Ocean.JOURNAL OF PHYSICAL OCEANOGRAPHY,53(9),2105-2120.
MLA	Chen, Zifei,et al."Downward Propagation and Trapping of Near-Inertial Waves by a Westward-Moving Anticyclonic Eddy in the Subtropical Northwestern Pacific Ocean".JOURNAL OF PHYSICAL OCEANOGRAPHY 53.9(2023):2105-2120.