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

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.

Saved in:
Bibliographic Details
Main Authors: Morlière, A., Hisard, Ph., Citeau, J.
Format: article biblioteca
Language:English
Published: 1974-06
Subjects:Atmospheric Sciences, Oceanography, Gulf of Guinea, currents, water circulation, salinity, temperature, upwelling,
Online Access:http://hdl.handle.net/1834/24858
Tags: Add Tag
No Tags, Be the first to tag this record!
id dig-aquadocs-1834-24858
record_format koha
spelling dig-aquadocs-1834-248582021-06-28T02:45:05Z Le courant de Lomonosov dans le fond du Golfe de Guinée en mai 1973 The Lomonosov undercurrent in the inner Gulf of Guinea in May 1973 Morlière, A. Hisard, Ph. Citeau, J. Atmospheric Sciences Oceanography Gulf of Guinea currents water circulation salinity temperature upwelling 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. 2021-06-24T16:16:43Z 2021-06-24T16:16:43Z 1974-06 article http://hdl.handle.net/1834/24858 en application/pdf application/pdf 85-102 http://aquaticcommons.org/id/eprint/8055 424 2012-03-09 08:56:56 8055 Centre de Recherches Océanographiques, Côte d'Ivoire
institution UNESCO
collection DSpace
country Francia
countrycode FR
component Bibliográfico
access En linea
databasecode dig-aquadocs
tag biblioteca
region Europa del Oeste
libraryname Repositorio AQUADOCS
language English
topic Atmospheric Sciences
Oceanography
Gulf of Guinea
currents
water circulation
salinity
temperature
upwelling
Atmospheric Sciences
Oceanography
Gulf of Guinea
currents
water circulation
salinity
temperature
upwelling
spellingShingle Atmospheric Sciences
Oceanography
Gulf of Guinea
currents
water circulation
salinity
temperature
upwelling
Atmospheric Sciences
Oceanography
Gulf of Guinea
currents
water circulation
salinity
temperature
upwelling
Morlière, A.
Hisard, Ph.
Citeau, J.
Le courant de Lomonosov dans le fond du Golfe de Guinée en mai 1973
description 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.
format article
topic_facet Atmospheric Sciences
Oceanography
Gulf of Guinea
currents
water circulation
salinity
temperature
upwelling
author Morlière, A.
Hisard, Ph.
Citeau, J.
author_facet Morlière, A.
Hisard, Ph.
Citeau, J.
author_sort Morlière, A.
title Le courant de Lomonosov dans le fond du Golfe de Guinée en mai 1973
title_short Le courant de Lomonosov dans le fond du Golfe de Guinée en mai 1973
title_full Le courant de Lomonosov dans le fond du Golfe de Guinée en mai 1973
title_fullStr Le courant de Lomonosov dans le fond du Golfe de Guinée en mai 1973
title_full_unstemmed Le courant de Lomonosov dans le fond du Golfe de Guinée en mai 1973
title_sort le courant de lomonosov dans le fond du golfe de guinée en mai 1973
publishDate 1974-06
url http://hdl.handle.net/1834/24858
work_keys_str_mv AT morlierea lecourantdelomonosovdanslefonddugolfedeguineeenmai1973
AT hisardph lecourantdelomonosovdanslefonddugolfedeguineeenmai1973
AT citeauj lecourantdelomonosovdanslefonddugolfedeguineeenmai1973
AT morlierea thelomonosovundercurrentintheinnergulfofguineainmay1973
AT hisardph thelomonosovundercurrentintheinnergulfofguineainmay1973
AT citeauj thelomonosovundercurrentintheinnergulfofguineainmay1973
_version_ 1756077952264568832