Horizon / Plein textes La base de ressources documentaires de l'IRD



Publications des scientifiques de l'IRD

Djakouré Sandrine, Penven Pierrick, Bourlès Bernard, Veitch J., Koné V. (2014). Coastally trapped eddies in the north of the Gulf of Guinea. Journal of Geophysical Research : Oceans, 119 (10), 6805-6819. ISSN 2169-9275

Accès réservé (Intranet IRD) Demander le PDF

Lien direct chez l'éditeur doi:10.1002/2014jc010243

Coastally trapped eddies in the north of the Gulf of Guinea
Année de publication2014
Type de documentArticle référencé dans le Web of Science WOS:000345499700017
AuteursDjakouré Sandrine, Penven Pierrick, Bourlès Bernard, Veitch J., Koné V.
SourceJournal of Geophysical Research : Oceans, 2014, 119 (10), p. 6805-6819. ISSN 2169-9275
RésuméCyclonic eddies generated downstream of Cape Palmas and Cape Three points have been suggested to contribute to the coastal upwelling along the northern coast of the Gulf of Guinea. A numerical analysis using a high-resolution model is used to investigate the mesoscale activity and the coastal upwelling generation processes. An eddy detection and tracking tool is applied to altimeter and model data, showing good agreement between these data sets. About two cyclonic eddies per year with an average radius of 60 km were identified downstream of both capes. These cyclonic eddies have an average lifetime of about 60 days during the major coastal upwelling period (boreal summer) and an eastward propagation. These cyclonic eddies are shallow, energetic (their relative vorticity can reach 3 times the earth's rotation), and dimensionless parameters show that they are in an eddy shedding regime. Mean flow interactions and barotropic instabilities associated with capes are their main generation processes. An idealized experiment is conducted in order to analyze the effect of capes on eddy generation and on coastal upwelling. It reveals that these cyclonic eddies generated downstream of capes are not the process responsible for this coastal upwelling. This experiment also suggests that the cyclonic eddies are the cause of the westward and coastal Guinea Counter Current that is associated with a transfer of energy from eddy kinetic to the mean flow.
Plan de classementLimnologie physique / Océanographie physique [032] ; Limnologie biologique / Océanographie biologique [034]
LocalisationFonds IRD [F B010063133]
Identifiant IRDfdi:010063133
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010063133

Export des données

Disponibilité des documents

Télechargment fichier PDF téléchargeable

Lien sur le Web lien chez l'éditeur

Accès réservé en accès réservé

HAL en libre accès sur HAL

Accès aux documents originaux :

Le FDI est labellisé CollEx

Accès direct

Bureau du chercheur

Site de la documentation

Espace intranet IST (accès réservé)

Suivi des publications IRD (accès réservé)

Mentions légales

Services Horizon

Poser une question

Consulter l'aide en ligne

Déposer une publication (accès réservé)

S'abonner au flux RSS

Voir les tableaux chronologiques et thématiques

Centres de documentation


Montpellier (centre IRD)

Montpellier (MSE)









La Paz