Western boundary current variability off french-guiana as observed from moored current measurements
Moored current measurements carried out from 31 March 1990 to 15 September 1991 in two stages at a point (near 6 degrees N) located over the mid-continental slope off French Guiana are presented. Six current meters were positioned between 200 and 2700 m depth. Upper level mean current data showed a...
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ftarchimer:oai:archimer.ifremer.fr:20897 2023-05-15T13:47:21+02:00 Western boundary current variability off french-guiana as observed from moored current measurements Colin, C Bourles, B Chuchla, R Dangu, F 1994 application/pdf https://archimer.ifremer.fr/doc/00098/20897/18510.pdf https://archimer.ifremer.fr/doc/00098/20897/ eng eng Gauthier-Villars https://archimer.ifremer.fr/doc/00098/20897/18510.pdf https://archimer.ifremer.fr/doc/00098/20897/ info:eu-repo/semantics/openAccess restricted use Oceanologica Acta (0399-1784) (Gauthier-Villars), 1994 , Vol. 17 , N. 4 , P. 345-354 text Publication info:eu-repo/semantics/article 1994 ftarchimer 2021-09-23T20:21:17Z Moored current measurements carried out from 31 March 1990 to 15 September 1991 in two stages at a point (near 6 degrees N) located over the mid-continental slope off French Guiana are presented. Six current meters were positioned between 200 and 2700 m depth. Upper level mean current data showed a northwestward flowing North Brazil Current (NBC) with mean velocity values decreasing from 10 cm/s in the range 200-250 m to almost zero at 800 m depth, the level of the Antarctic Intermediate Waters. In the range 500-800 m, the current reversed in spring in the presence of the southeastward Western Boundary Under Current (WBUC); the mean velocity from February to June 1991 is around 2 cm/s. Deep currents over the continental rise show a strong southeastward Deep Western Boundary Current extending from around 1000 m depth to the bottom (3000 m depth in this case) with mean core speeds of 20 cm/s at 2000-2070 m depth. Transport estimates based on these data and a few Pegasus sections for the mean vertical and lateral extensions of the DWBC yield a value of 21 x 10(6) m(3)/s at that location. Low-frequency current fluctuations were dominated by a well-defined 50- to 70-day period oscillation with peak-to-peak northwestward velocity amplitude of around 90 cm/s at the upper level. The mean vertical eddy kinetic energy distribution showed an abrupt decrease of the energy down to 800 m depth and a slight decrease below and down to the bottom. Article in Journal/Newspaper Antarc* Antarctic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic The Antarctic |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
Moored current measurements carried out from 31 March 1990 to 15 September 1991 in two stages at a point (near 6 degrees N) located over the mid-continental slope off French Guiana are presented. Six current meters were positioned between 200 and 2700 m depth. Upper level mean current data showed a northwestward flowing North Brazil Current (NBC) with mean velocity values decreasing from 10 cm/s in the range 200-250 m to almost zero at 800 m depth, the level of the Antarctic Intermediate Waters. In the range 500-800 m, the current reversed in spring in the presence of the southeastward Western Boundary Under Current (WBUC); the mean velocity from February to June 1991 is around 2 cm/s. Deep currents over the continental rise show a strong southeastward Deep Western Boundary Current extending from around 1000 m depth to the bottom (3000 m depth in this case) with mean core speeds of 20 cm/s at 2000-2070 m depth. Transport estimates based on these data and a few Pegasus sections for the mean vertical and lateral extensions of the DWBC yield a value of 21 x 10(6) m(3)/s at that location. Low-frequency current fluctuations were dominated by a well-defined 50- to 70-day period oscillation with peak-to-peak northwestward velocity amplitude of around 90 cm/s at the upper level. The mean vertical eddy kinetic energy distribution showed an abrupt decrease of the energy down to 800 m depth and a slight decrease below and down to the bottom. |
format |
Article in Journal/Newspaper |
author |
Colin, C Bourles, B Chuchla, R Dangu, F |
spellingShingle |
Colin, C Bourles, B Chuchla, R Dangu, F Western boundary current variability off french-guiana as observed from moored current measurements |
author_facet |
Colin, C Bourles, B Chuchla, R Dangu, F |
author_sort |
Colin, C |
title |
Western boundary current variability off french-guiana as observed from moored current measurements |
title_short |
Western boundary current variability off french-guiana as observed from moored current measurements |
title_full |
Western boundary current variability off french-guiana as observed from moored current measurements |
title_fullStr |
Western boundary current variability off french-guiana as observed from moored current measurements |
title_full_unstemmed |
Western boundary current variability off french-guiana as observed from moored current measurements |
title_sort |
western boundary current variability off french-guiana as observed from moored current measurements |
publisher |
Gauthier-Villars |
publishDate |
1994 |
url |
https://archimer.ifremer.fr/doc/00098/20897/18510.pdf https://archimer.ifremer.fr/doc/00098/20897/ |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Oceanologica Acta (0399-1784) (Gauthier-Villars), 1994 , Vol. 17 , N. 4 , P. 345-354 |
op_relation |
https://archimer.ifremer.fr/doc/00098/20897/18510.pdf https://archimer.ifremer.fr/doc/00098/20897/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
_version_ |
1766246963096846336 |