DOI: 10.1029/2018JC013986
Scopus记录号: 2-s2.0-85050504861
论文题名: Infragravity Wave Radiation Across the Shelf Break
作者: Smit P.B. ; Janssen T.T. ; Herbers T.H.C. ; Taira T. ; Romanowicz B.A.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 7 起始页码: 4483
结束页码: 4490
语种: 英语
英文关键词: infragravity waves
; modeling
; observations
; shelf break
; wave trapping
英文摘要: Observations collected as part of the Cascadia Amphibious Array (Oregon-Washington coast) show that ocean surface infragravity (IG) waves (periods from 30 to 250 s) in the Pacific Ocean originate from the coastal zone. With the deepest observations at 1909 m, we identify tidal modulation and a dramatic reduction in energy as IG waves cross the shelf break. Observations are consistent with radiation from an isotropic, nearshore source, and provide quantitative verification linking oceanic IG fluctuations with nearshore motions. Our analysis demonstrates that trapping of IG waves on the shelf break strongly reduces energy radiation into ocean basins. Further, for narrow continental shelves (U.S. West Coast), energy levels past the shelf break depend only weakly on shelf geometry. Consequently, oceanic energy levels can be related to coastal sources by scaling relations predicted by geometric optics, simplifying the effort to estimate the impact of radiated IG-waves on remote sites (e.g., to estimate seismic noise levels or impact on ice shelves). ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113565
Appears in Collections: 气候减缓与适应
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作者单位: Spoondrift Technologies, Half Moon Bay, CA, United States; NorthWest Research Associates, Monterey, CA, United States; University of California, Berkeley Seismological Laboratory, Berkeley, CA, United States
Recommended Citation:
Smit P.B.,Janssen T.T.,Herbers T.H.C.,et al. Infragravity Wave Radiation Across the Shelf Break[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(7)