DOI: 10.1002/2014GL061226
论文题名: PSI to turbulence during internal wave beam refraction through the upper ocean pycnocline
作者: Gayen B. ; Sarkar S.
刊名: Geophysical Research Letters
ISSN: 0094-9472
EISSN: 1944-9203
出版年: 2014
卷: 41, 期: 24 起始页码: 8953
结束页码: 8960
语种: 英语
英文关键词: internal wave breaking
; ocean mixing
; turbulence
Scopus关键词: Large eddy simulation
; Liquid waves
; Refraction
; Turbulence
; Convective instabilities
; Internal wave beams
; Internal wave breaking
; Nonlinear interactions
; Ocean mixing
; Subharmonic instability
; Subharmonic waves
; Transition to turbulence
; Oceanography
; energetics
; harmonic analysis
; instability
; internal wave
; numerical model
; three-dimensional modeling
; turbulent mixing
; wave breaking
; Kaena Ridge
; Pacific Ocean
英文摘要: A numerical study based on large eddy simulation (LES) is performed to investigate the nonlinear interaction of a semidiurnal (M2) internal wave beam with an upper ocean pycnocline. During refraction through the pycnocline, the wave beam undergoes parametric subharmonic instability (PSI) with formation of waves with (1/2)M2 frequency. The three-dimensional LES enables new results that quantify the route to turbulence through PSI. The subharmonic waves generated from PSI have an order of magnitude smaller vertical scale and are susceptible to wave breaking. Convective instability initiates transition to turbulence, while shear production maintains it. Turbulence at points in the subharmonic wave paths is modulated at (1/2)M2 frequency. The beam suffers substantial degradation owing to PSI, reflected harmonics and ducted waves so that only about 30% of the incoming energy is transported by the main reflected beam. Key Points Internal waves suffer PSI and then break down to turbulence through convective instabilityTurbulence energetics and phasing during beam refraction has been quantifiedSubharmonics, turbulence, and harmonics substantially weakens the beam that is reflected from the pcynocline similar to observations at Kaena Ridge ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921856893&doi=10.1002%2f2014GL061226&partnerID=40&md5=10b69472b169d31b70078afba83e1d63
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6736
Appears in Collections: 气候减缓与适应
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作者单位: Research School of Earth Science, Australian National University, Canberra, ACT, Australia
Recommended Citation:
Gayen B.,Sarkar S.. PSI to turbulence during internal wave beam refraction through the upper ocean pycnocline[J]. Geophysical Research Letters,2014-01-01,41(24).