Enhanced Dissipation of Internal Tides in a Mesoscale Baroclinic Eddy

doi:10.1175/JPO-D-23-0045.1

IOCAS-IR

	Enhanced Dissipation of Internal Tides in a Mesoscale Baroclinic Eddy
	Wang, Yang1,2 ; Legg, Sonya 2
	2023-10-01
发表期刊	JOURNAL OF PHYSICAL OCEANOGRAPHY
ISSN	0022-3670
卷号	53 期号:10 页码:2293-2316
通讯作者	Wang, Yang(yangwangow@gmail.com)
摘要	The dissipation of low-mode internal tides as they propagate through mesoscale baroclinic eddies is exam-ined using a series of numerical simulations, complemented by three-dimensional ray tracing calculations. The incident mode-1 internal tide is refracted into convergent energy beams, resulting in a zone of reduced energy flux in the lee of the eddy. The dissipation of internal tides is significantly enhanced in the upper water column within strongly baroclinic (anti-cyclonic) eddies, exhibiting a spatially asymmetric pattern, due to trapped high-mode internal tides. Where the eddy veloc-ity opposes the internal tide propagation velocity, high-mode waves can be trapped within the eddy, whereas high modes can freely propagate away from regions where eddy and internal wave velocities are in the same direction. The trapped high modes with large vertical shear are then dissipated, with the asymmetric distribution of trapping leading to the asym-metric distribution of dissipation. Three-dimensional ray tracing solutions further illustrate the importance of the baroclinic current for wave trapping. Similar enhancement of dissipation is also found for a baroclinic cyclonic eddy. However, a bar-otropic eddy is incapable of facilitating robust high modes and thus cannot generate significant dissipation of internal tides, despite its strong velocities. Both energy transfer from low to high modes in the baroclinic eddy structure and trapping of those high modes by the eddy velocity field are therefore necessary to produce internal wave dissipation, a conclusion con-firmed by examining the sensitivity of the internal tide dissipation to eddy radius, vorticity, and vertical scale.
关键词	Ocean Internal waves Mixing
DOI	10.1175/JPO-D-23-0045.1
收录类别	SCI
语种	英语
资助项目	Outstanding Research Assistant Funding Program of Chinese Academy of Sciences ; National Science Foundation of China[42006031] ; National Oceanic and Atmospheric Administration, U.S. Department of Commerce[NA18OAR4320123]
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:001084624700001
出版者	AMER METEOROLOGICAL SOC
WOS关键词	TIDAL ENERGY ; KAENA RIDGE ; WAVES ; OCEAN ; PROPAGATION ; REFLECTION ; TOPOGRAPHY ; SCATTERING ; ENERGETICS ; REFRACTION
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/337002/181587
专题	中国科学院海洋研究所
通讯作者	Wang, Yang
作者单位	1.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China 2.Princeton Univ, Program Atmospher & Ocean Sci, Princeton, NJ 08540 USA
第一作者单位	中国科学院海洋研究所
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	Wang, Yang,Legg, Sonya. Enhanced Dissipation of Internal Tides in a Mesoscale Baroclinic Eddy[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2023,53(10):2293-2316.
APA	Wang, Yang,&Legg, Sonya.(2023).Enhanced Dissipation of Internal Tides in a Mesoscale Baroclinic Eddy.JOURNAL OF PHYSICAL OCEANOGRAPHY,53(10),2293-2316.
MLA	Wang, Yang,et al."Enhanced Dissipation of Internal Tides in a Mesoscale Baroclinic Eddy".JOURNAL OF PHYSICAL OCEANOGRAPHY 53.10(2023):2293-2316.

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