IOCAS-IR
Enhanced Dissipation of Internal Tides in a Mesoscale Baroclinic Eddy
Wang, Yang1,2; Legg, Sonya2
2023-10-01
Source PublicationJOURNAL OF PHYSICAL OCEANOGRAPHY
ISSN0022-3670
Volume53Issue:10Pages:2293-2316
Corresponding AuthorWang, Yang(yangwangow@gmail.com)
AbstractThe 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.
KeywordOcean Internal waves Mixing
DOI10.1175/JPO-D-23-0045.1
Indexed BySCI
Language英语
Funding ProjectOutstanding 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 Research AreaOceanography
WOS SubjectOceanography
WOS IDWOS:001084624700001
PublisherAMER METEOROLOGICAL SOC
WOS KeywordTIDAL ENERGY ; KAENA RIDGE ; WAVES ; OCEAN ; PROPAGATION ; REFLECTION ; TOPOGRAPHY ; SCATTERING ; ENERGETICS ; REFRACTION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/181587
Collection中国科学院海洋研究所
Corresponding AuthorWang, Yang
Affiliation1.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China
2.Princeton Univ, Program Atmospher & Ocean Sci, Princeton, NJ 08540 USA
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
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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