Data/hora: 04/06/2024 09:06:31

Provedor de dados: | 5
País: | France
Título: | Antarctic bottom water flow through the Vema fracture zone
Autores: | Vangriesheim, Annick.
Data: | 1980
Ano: | 1980
Palavras-chave: | Hydrologie; Courants profonds; Eau de fond antartique; Zone de fracture Vema; Hydrology; Bottom currents; Antarctic bottom water; Vema fracture zone.
Resumo: | During the October-November 1977 R/V "Jean Charcot" cruise, bathymetric and hydrological surveys of the Eastern Vema Fracture Zone were carried out in order to moor current meters on the silliocated in the area, with the aim of evaluating the bottom water flow through this passage in the Mid-Atlantic Ridge. The sill zone in fact comprises a succession of three secondary sills situated between 40052'W and 41°02'W at about 10048'N, at depths ranging from 4600 to 4700 m. Westward of the sills, there is a thick (750-950 m) bottom water layer of Antarctic origin. The potential temperature found at the bottom is 1. 30°C. In the sill zone, the homogeneous layer is thinner and has a potential temperature of 1.40°C. Eastward of the sills, the homogeneous layer is 1000 m thick, with e "-' 1. 51°C. Five current meter moorings were deployed in this bottom layer: one was placed directly on the sills, one slightly to the east, two slightly to the west and the fIfth 200 km further west. Current speeds increase from west to east. Mean speeds range from "-' 3 cm/sec. at the western moorings to "-' 9 cm/sec. on the sills, reaching 25 cm/sec. at the eastern mooring, where the maximum speed was found to be 42 cm/sec. On and eastward of the sills, the current direction fluctuates slightly between east and north-east. These results confIrm the eastward flow of Antarctic bottom water with a strong intensifIcation above the sills.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/00323/43425/43092.pdf

http://archimer.ifremer.fr/doc/00323/43425/

Editor: | Gauthier-villars
Formato: | application/pdf
Fonte: | Oceanologica Acta (0399-1784) (Gauthier-villars), 1980 , Vol. 3 , N. 2 , P. 199-207

Fonte:

Gauthier-Villars

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