Spontaneous near-inertial wave generation from mesoscale eddy: Nonlinear forcing mechanism

doi:10.1063/5.0156176

IOCAS-IR > 海洋环流与波动重点实验室

	Spontaneous near-inertial wave generation from mesoscale eddy: Nonlinear forcing mechanism
	Zhao, Bo 1,2; Liu, Zhiliang 1,2; Xu, Zhenhua 3,4,5,6; Yin, Baoshu 3,4,5,6; Zheng, Quanan 7
	2023-07-01
发表期刊	PHYSICS OF FLUIDS
ISSN	1070-6631
卷号	35 期号:7 页码:14
通讯作者	Liu, Zhiliang(zhlliu3897@hevttc.edu.cn) ; Xu, Zhenhua(xuzhenhua@qdio.ac.cn)
摘要	The spontaneous generation of near-inertial waves (NIWs) from quasi-geostrophic mesoscale eddies in a stratified fluid is investigated and the process and mechanism clarified by numerical modeling and a theoretical analysis. Mesoscale eddies, as slow balance flows, are inevitably accompanied by unbalanced near-inertial oscillations (NIOs) in their long period evolution. A mesoscale eddy supplies kinetic energy to NIOs through its interaction with perturbations, which exist universally in the world oceans. Afterward, NIWs are generated spontaneously via the nonlinear coupling of the eddy and NIOs. The baroclinicity of mesoscale eddies is an essential condition of this spontaneous NIW generation mechanism. The resonance of the NIWs and NIOs enables the internal wave continuum to be dominated by NIWs, which share the same horizontal wavenumbers with the eddy. After generation, the NIWs radiate energy toward the eddy center and remain stationary as a whole, relative to the propagating eddy. Generally, an anticyclonic mesoscale eddy can emit much stronger NIWs than does a cyclonic eddy. The NIW intensity strengthens exponentially with the Rossby number. The essence of this spontaneous NIW generation mechanism is the nonlinear interaction between slow balance flows and the accompanying fast motions. It represents an effective pathway for mesoscale eddy energy sinks and makes a non-negligible contribution to the global NIW energy. Published under an exclusive license by AIP Publishing.
DOI	10.1063/5.0156176
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[92058202] ; National Natural Science Foundation of China[92258301] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB42000000] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDA22050202] ; Shandong special funding for Qingdao Pilot National Laboratory for Marine Science and Technology[2022QNLM010302]
WOS研究方向	Mechanics ; Physics
WOS类目	Mechanics ; Physics, Fluids & Plasmas
WOS记录号	WOS:001060308700009
出版者	AIP Publishing
WOS关键词	SOUTH CHINA SEA ; INTERNAL GRAVITY-WAVES ; KINETIC-ENERGY ; PART I ; VORTEX ; RADIATION ; DISSIPATION ; PROPAGATION ; CIRCULATION ; INSTABILITY
引用统计	被引频次：1[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/337002/182084
专题	海洋环流与波动重点实验室
通讯作者	Liu, Zhiliang; Xu, Zhenhua
作者单位	1.Hebei Normal Univ Sci & Technol, Marine Sci Res Ctr, Qinhuangdao 066004, Hebei, Peoples R China 2.Hebei Key Lab Ocean Dynam Resources & Environm, Qinhuangdao 066004, Hebei, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China 4.Pilot Natl Lab Marine Sci & Technol, Qingdao 266237, Peoples R China 5.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China 6.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 7.Univ Maryland, Dept Atmospher & Ocean Sci, College Pk, MD 27042 USA
通讯作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Zhao, Bo,Liu, Zhiliang,Xu, Zhenhua,et al. Spontaneous near-inertial wave generation from mesoscale eddy: Nonlinear forcing mechanism[J]. PHYSICS OF FLUIDS,2023,35(7):14.
APA	Zhao, Bo,Liu, Zhiliang,Xu, Zhenhua,Yin, Baoshu,&Zheng, Quanan.(2023).Spontaneous near-inertial wave generation from mesoscale eddy: Nonlinear forcing mechanism.PHYSICS OF FLUIDS,35(7),14.
MLA	Zhao, Bo,et al."Spontaneous near-inertial wave generation from mesoscale eddy: Nonlinear forcing mechanism".PHYSICS OF FLUIDS 35.7(2023):14.