Data/hora: 09/06/2024 15:53:19

Provedor de dados: | 5
País: | France
Título: | Biweekly current oscillations on the continental slope of the Gulf of Guinea
Autores: | Vangriesheim, Annick; Treguier, Anne-marie; Andre, Gael.
Data: | 2005-11
Ano: | 2005
Palavras-chave: | Linear wave model; Current meter measurement; Current oscillation; Continental slope.
Resumo: | Current meter measurements have been carried out for 3 years on the continental slope of the Gulf of Guinea, near 7.5 degrees S off the Angola coast. Currents in a water depth of 1300 m over the continental slope show a remarkable biweekly oscillation, bottom intensified, and with currents oriented nearly parallel to the isobaths. With a peak-to-peak amplitude reaching 20-30 cm s(-1) at 30 in above the bottom, this signal is the most energetic at sub-inertial frequencies. Simultaneous measurements deeper on the continental rise (in a water depth of 4000 m) show a more complex signal dominated by lower frequencies, and with less clear polarization. Simple linear topographic wave theories are compared to the observations. A combination of coastal trapped waves with cross-slope mode 3-5 could be consistent with the observed currents. A three-dimensional 1/6 degrees model suggests the existence of modes trapped to the slope, although with lower amplitude than observed.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/2005/publication-1032.pdf

DOI:10.1016/j.dsr.2005.05.010

Editor: | Elsevier
Relação: | http://archimer.ifremer.fr/doc/00000/1032/
Formato: | application/pdf
Fonte: | Deep Sea Research Part I: Oceanographic Research Papers (0967-0637) (Elsevier), 2005-11 , Vol. 52 , N. 11 , P. 2168-2183
Fonte: | 2005 Elsevier Ltd All rights reserved