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

IRD

 

Publications des scientifiques de l'IRD

Halo I., Penven Pierrick, Backeberg B., Ansorge I., Shillington F., Roman R. (2014). Mesoscale eddy variability in the southern extension of the East Madagascar Current : seasonal cycle, energy conversion terms, and eddy mean properties. Journal of Geophysical Research : Oceans, 119 (10), 7324-7356. ISSN 2169-9275

Accès réservé (Intranet IRD) Demander le PDF

Lien direct chez l'éditeur doi:10.1002/2014jc009820

Titre
Mesoscale eddy variability in the southern extension of the East Madagascar Current : seasonal cycle, energy conversion terms, and eddy mean properties
Année de publication2014
Type de documentArticle référencé dans le Web of Science WOS:000345499700047
AuteursHalo I., Penven Pierrick, Backeberg B., Ansorge I., Shillington F., Roman R.
SourceJournal of Geophysical Research : Oceans, 2014, 119 (10), p. 7324-7356. ISSN 2169-9275
RésuméIn this study, we used more than 17 years of satellite altimetry observations and output from an ocean model to investigate the mesoscale eddy variability and forcing mechanisms to the south of Madagascar. Analysis of energy conversion terms in the model has shown seasonality on eddy formation, both by barotropic and baroclinic instabilities: maximum in winter (JJA) and minimum in summer (DJF). The eddies were mainly formed in the upper ocean (0-300 m) and at intermediate depths (800-2000 m) by barotropic and baroclinic instabilities, respectively. The former dominated in the southeastern margin of Madagascar, and the latter to the southwest, where the South-East Madagascar Current (SEMC) separates from the continental shelf. Seasonality of the eddy formation appeared linked with the seasonal intensification of the SEMC. The energy conversion terms indicated that the eddies have a significant contribution to the large-scale circulation, but not being persistent throughout the year, occurring mainly during the fall season (MAM). Eddy demography from altimetry and model provided information on eddy preferential sites for birth, annual occurrence (6-13 per year), eddy mean diameter (124-178 km), mean amplitude (9-28 cm), life-time (90-183 days), and maximum traveling distances (325-1052 km). Eddies formed to the southwest of Madagascar exhibited distinct characteristics from those formed in the southeast. Nevertheless, all eddies were highly nonlinear, suggesting that they are potential vectors of connectivity between Madagascar and Africa. This may have a significant impact on the ecology of this region.
Plan de classementLimnologie physique / Océanographie physique [032] ; Télédétection [126]
Descr. géo.OCEAN INDIEN ; MOZAMBIQUE CANAL ; MADAGASCAR
LocalisationFonds IRD [F B010063132]
Identifiant IRDfdi:010063132
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010063132

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

Bondy

Montpellier (centre IRD)

Montpellier (MSE)

Cayenne

Nouméa

Papeete

Abidjan

Dakar

Niamey

Ouagadougou

Tunis

La Paz

Quito