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

IRD

Publications des scientifiques de l'IRD

Han W. Q., Meehl G. A., Hu A. X., Zheng J., Kenigson J., Vialard Jérôme, Rajagopalan B., Yanto. (2017). Decadal variability of the Indian and Pacific Walker cells since the 1960s : do they covary on decadal time scales ?. Journal of Climate, 30 (21), 8447-8468. ISSN 0894-8755

Accès réservé (Intranet IRD) Document en accès réservé (Intranet IRD)

Lien direct chez l'éditeur doi:10.1175/jcli-d-16-0783.1

Titre
Decadal variability of the Indian and Pacific Walker cells since the 1960s : do they covary on decadal time scales ?
Année de publication2017
Type de documentArticle référencé dans le Web of Science WOS:000414646000002
AuteursHan W. Q., Meehl G. A., Hu A. X., Zheng J., Kenigson J., Vialard Jérôme, Rajagopalan B., Yanto.
SourceJournal of Climate, 2017, 30 (21), p. 8447-8468. ISSN 0894-8755
RésuméPrevious studies have investigated the centennial and multidecadal trends of the Pacific and Indian Ocean Walker cells (WCs) during the past century, but have obtained no consensus owing to data uncertainties and weak signals of the long-term trends. This paper focuses on decadal variability (periods of one to few decades) by first documenting the variability of the WCs and warm-pool convection, and their covariability since the 1960s, using in situ and satellite observations and reanalysis products. The causes for the variability and covariability are then explored using a Bayesian dynamic linear model, which can extract nonstationary effects of climate modes. The warm-pool convection exhibits apparent decadal variability, generally covarying with the Indian and Pacific Ocean WCs during winter (November-April) with enhanced convection corresponding to intensified WCs, and the Indian-Pacific WCs covary. During summer (May-October), the warm-pool convection still highly covaries with the Pacific WC but does not covary with the Indian Ocean WC, and the Indian-Pacific WCs are uncorrelated. The wintertime coherent variability results from the vital influence of ENSO decadal variation, which reduces warm-pool convection and weakens the WCs during El Nino-like conditions. During summer, while ENSO decadal variability still dominates the Pacific WC, decadal variations of ENSO, the Indian Ocean dipole, Indian summer monsoon convection, and tropical Indian Ocean SST have comparable effects on the Indian Ocean WC overall, with monsoon convection having the largest effect since the 1990s. The complex causes for the Indian Ocean WC during summer result in its poor covariability with the Pacific WC and warm-pool convection.
Plan de classementLimnologie physique / Océanographie physique [032] ; Sciences du milieu [021]
Descr. géo.PACIFIQUE ; OCEAN INDIEN
LocalisationFonds IRD [F B010071355]
Identifiant IRDfdi:010071355
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010071355

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 :

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)

Nouméa

Papeete

Niamey

Ouagadougou

Tunis

La Paz

Quito