Le courant de Lomonosov dans le fond du Golfe de Guinée en mai 1973

Morlière, A. and Hisard, Ph. and Citeau, J. (1974) Le courant de Lomonosov dans le fond du Golfe de Guinée en mai 1973. Documents Scientifiques, Centre de Recherches Océanographiques, Abidjan, 5(1-2), pp. 85-102.

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Abstract

A cruise of the R. V. Capricorne in May 1973, in inner part of the gulf of Guinea, allowed the authors to identify the main part of the Atlantic circulation at the longitude of 5 degrees E, between 4 degrees N and 4 degrees S. It gave new data on the termination of the equatorial undercurrent. At the equator, under the westward south equatorial current flows the Atlantic equatorial undercurrent with a maximum eastward velocity of 90 cm/sec at 30 m depth linked to a salinity maximum higher than 36.20 ppt. Below the equatorial undercurrent, about 80-100 m depth, flows a westward current with a velocity as high as 30 cm/sec. At 4 degrees S, the south equatorial countercurrent is well delineated by a high salinity core (more than 36.10 ppt) at 30 m depth with an eastward velocity core of 40 cm/sec. On the contrary, near 3 degrees 30N, a high salinity core (36.10 ppt) flows westwards with a speed of 40 cm/sec at 40 m depth: it is the "return flow" of the undercurrent (Hisard and Moliere 1974). At 4 degrees N the Guinea current carries eastwards surface salinities of 34.50 ppt at 40 cm/sec. Off Cape Lopez (0 degrees 35'S-8 degrees 42'E) the high salinity core of the undercurrent becomes wider near the shore. It is 25m wide offshore, and 70 m wide near the cape. A part of undercurrent water extends northwards, then flows westwards with the subsurface westward circulation in the inner part of the Gulf of Guinea. Another part flows south-southwestwards in a high salinity tongue along the African coast to 4 degrees S. South-west of Cape Lopez, the trades divergence contributes to an upwelling of cold and high salinity water; this water increases at the Cape Lopez front.

Item Type: Article
Title: Le courant de Lomonosov dans le fond du Golfe de Guinée en mai 1973
Personal Creator/Author:
CreatorsEmail
Morlière, A.
Hisard, Ph.
Citeau, J.
Journal or Publication Title: Documents Scientifiques, Centre de Recherches Océanographiques, Abidjan
Volume: 5
Number: 1-2
Page Range: pp. 85-102
Date: June 1974
Issuing Agency: Centre de Recherches Océanographiques, Côte d'Ivoire
Uncontrolled Keywords: Gulf of Guinea; currents; water circulation; salinity; temperature; upwelling
Subjects: Atmospheric Sciences
Oceanography
Item ID: 8055
Depositing User: Ms Maria Kalentsits
Date Deposited: 09 Mar 2012 08:56
Last Modified: 09 Mar 2012 08:56
URI: http://aquaticcommons.org/id/eprint/8055

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