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

IRD

 

Publications des scientifiques de l'IRD

Deshayes Julie, Curry R., Msadek R. (2014). CMIP5 model intercomparison of freshwater budget and circulation in the North Atlantic. Journal of Climate, 27 (9), 3298-3317. ISSN 0894-8755

Accès réservé (Intranet IRD) Demander le PDF

Lien direct chez l'éditeur doi:10.1175/jcli-d-12-00700.1

Titre
CMIP5 model intercomparison of freshwater budget and circulation in the North Atlantic
Année de publication2014
Type de documentArticle référencé dans le Web of Science WOS:000337272700009
AuteursDeshayes Julie, Curry R., Msadek R.
SourceJournal of Climate, 2014, 27 (9), p. 3298-3317. ISSN 0894-8755
RésuméThe subpolar North Atlantic is a center of variability of ocean properties, wind stress curl, and air-sea exchanges. Observations and hindcast simulations suggest that from the early 1970s to the mid-1990s the subpolar gyre became fresher while the gyre and meridional circulations intensified. This is opposite to the relationship of freshening causing a weakened circulation, most often reproduced by climate models. The authors hypothesize that both these configurations exist but dominate on different time scales: a fresher subpolar gyre when the circulation is more intense, at interannual frequencies (configuration A), and a saltier subpolar gyre when the circulation is more intense, at longer periods (configuration B). Rather than going into the detail of the mechanisms sustaining each configuration, the authors' objective is to identify which configuration dominates and to test whether this depends on frequency, in preindustrial control runs of five climate models from phase 5 of the Coupled Model Intercomparison Project (CMIP5). To this end, the authors have developed a novel intercomparison method that enables analysis of freshwater budget and circulation changes in a physical perspective that overcomes model specificities. Lag correlations and a cross-spectral analysis between freshwater content changes and circulation indices validate the authors' hypothesis, as configuration A is only visible at interannual frequencies while configuration B is mostly visible at decadal and longer periods, suggesting that the driving role of salinity on the circulation depends on frequency. Overall, this analysis underscores the large differences among state-of-the-art climate models in their representations of the North Atlantic freshwater budget.
Plan de classementLimnologie physique / Océanographie physique [032]
Descr. géo.ATLANTIQUE NORD
LocalisationFonds IRD [F B010062266]
Identifiant IRDfdi:010062266
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010062266

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