DOI: 10.1002/2015GL065650
论文题名: Topographic height dependence of internal wave generation by tidal flow over random topography
作者: Zhao J. ; Zhang L. ; Swinney H.L.
刊名: Geophysical Research Letters
ISSN: 0094-8567
EISSN: 1944-8298
出版年: 2015
卷: 42, 期: 19 起始页码: 8081
结束页码: 8087
语种: 英语
英文关键词: internal waves
; tidal conversion
; topographic interactions
Scopus关键词: Topography
; Internal waves
; Ocean circulation
; Ocean topography
; Power dependence
; Power increase
; Spatial resolution
; Supercritical
; Topographic profiles
; Oceanography
; abyssal hill
; height
; internal wave
; numerical model
; oceanic circulation
; seafloor
; spatial resolution
; tidal current
; topographic effect
; wave generation
英文摘要: Internal waves (IWs) generated by tidal flow over the seafloor play a critical role in ocean circulation and climate. We determine the dependence of the radiated IW power on topographic parameters in numerical simulations of tidal flow over two-dimensional random topographic profiles that have the spectrum of oceanic abyssal hills. The IW power increases as the horizontal spatial resolution scale is decreased, but below a certain spatial scale the power saturates at a level less than the linear theory prediction. For increasing topographic RMS height Hrms the emergent interference of the tide and the IWs from different generation sites leads to a transition in the IW power dependence on Hrms from quadratic to linear. This transition in the scaling of the IW power depends on the slopes of a valley's nearest neighboring peaks. Our results should guide the modeling of IW generation by tidal flow over small-scale ocean topography. Key Points Wave interference suppresses internal waves (IWs) generated by random topography With increasing topographic resolution, IW power saturates at a level less than linear theory predicts IW power scales linearly with the height of supercritical random topography © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946950152&doi=10.1002%2f2015GL065650&partnerID=40&md5=09a4e6a1b0db3fd94bd6f7b716f456b4
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8183
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Physics and Center for Nonlinear Dynamics, University of Texas at Austin, Austin, TX, United States
Recommended Citation:
Zhao J.,Zhang L.,Swinney H.L.. Topographic height dependence of internal wave generation by tidal flow over random topography[J]. Geophysical Research Letters,2015-01-01,42(19).