DOI: 10.1029/2017JC013725
Scopus记录号: 2-s2.0-85052449569
论文题名: Internal Tide Generation at the Vitória-Trindade Ridge, South Atlantic Ocean
作者: Paiva A.M. ; Daher V.B. ; Costa V.S. ; Camargo S.S.B. ; Mill G.N. ; Gabioux M. ; Alvarenga J.B.R.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 8 起始页码: 5150
结束页码: 5159
语种: 英语
英文关键词: baroclinic tides
; internal waves
; western South Atlantic
英文摘要: Sea surface height data from multiple satellite altimetric missions are analyzed in order to investigate the surface manifestation of internal tides generated at the Vitória-Trindade Ridge (VTR), in the western South Atlantic Ocean. The VTR is formed by a sequence of submerged seamounts disposed in a west-east alignment around 20.5°S, extending for over 1,000 km from the Brazilian continental margin to the Trindade and Martim Vaz islands. Point-wise harmonic analysis of the along-track sea surface height data, combined with a two-dimensional plane wave fitting at selected subregions, depicts well-organized northbound and southbound wave beams radiating from the VTR, and propagating as far as ~1,000 km from the ridge. Energy convergence is observed at a focal point located circa 300 km south of the VTR, associated with a lens effect due to the arc-shaped ridge. Wavenumber spectra show highest energy associated with wavelengths of 140 and 70 km, close to the theoretical values expected for the first and second baroclinic modes, respectively. Energy fluxes for the mode 1 principal lunar (M2) constituent reach values of 2 to 3 kW/m for the southward beams and 1 kW/m north of the VTR. Judging from its surface signature, the VTR appears to be the most significant internal tide generation site in the western South Atlantic. ©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/113444
Appears in Collections: 气候减缓与适应
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作者单位: Ocean Engineering Program – COPPE, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil; Navy Hydrographic Center, Brazilian Navy, Rio de Janeiro, Brazil
Recommended Citation:
Paiva A.M.,Daher V.B.,Costa V.S.,et al. Internal Tide Generation at the Vitória-Trindade Ridge, South Atlantic Ocean[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(8)