Publications des scientifiques de l'IRD

Nidheesh A. G., Lengaigne Matthieu, Vialard Jérôme, Izumo Takeshi, Unnikrishnan A. S., Cassou C. (2017). Influence of ENSO on the Pacific decadal oscillation in CMIP models. Climate Dynamics, 49 (9-10), p. 3309-3326. ISSN 0930-7575.

Titre du document
Influence of ENSO on the Pacific decadal oscillation in CMIP models
Année de publication
2017
Type de document
Article référencé dans le Web of Science WOS:000414153800022
Auteurs
Nidheesh A. G., Lengaigne Matthieu, Vialard Jérôme, Izumo Takeshi, Unnikrishnan A. S., Cassou C.
Source
Climate Dynamics, 2017, 49 (9-10), p. 3309-3326 ISSN 0930-7575
Emerging decadal climate predictions call for an assessment of decadal climate variability in the Coupled Model Intercomparison Project (CMIP) database. In this paper, we evaluate the influence of El Nio Southern Oscillation (ENSO) on Pacific Decadal Oscillation (PDO) in 10 control simulations from the CMIP3 and 22 from the CMIP5 database. All models overestimate the time lag between ENSO forcing and the PDO response. While half of the models exhibit ENSO-PDO correlation which is close to that in observation (> 0.5) when the time lag is accounted for, the rest of the models underestimate this relationship. Models with stronger ENSO-PDO correlation tend to exhibit larger PDO-related signals in the equatorial and south Pacific, highlighting the key role of ENSO teleconnection in setting the inter-hemispheric Pacific pattern of the PDO. The strength of the ENSO-PDO relationship is related to both ENSO amplitude and strength of ENSO teleconnection to the North Pacific sea-level pressure variability in the Aleutian Low region. The shape of the PDO spectrum is consistent with that predicted from a combination of direct ENSO forcing, atmospheric stochastic forcing over the North Pacific and the re-emergence process in 27 models out of 32. Given the essential role of ENSO in shaping the Pacific decadal variability, models displaying realistic ENSO amplitude and teleconnections should be preferentially used to perform decadal prediction experiments.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020] ; Sciences du milieu [021] ; Limnologie physique / Océanographie physique [032]
Description Géographique
PACIFIQUE
Localisation
Fonds IRD [F B010071329]
Identifiant IRD
fdi:010071329
Contact