A wavelet-based approach to detect climate change on the coherent and turbulent component of the atmospheric circulation

Abstract : The modifications of atmospheric circulation induced by anthropogenic effects are difficult to capture because wind fields feature a complex spectrum where the signal of large-scale coherent structures (planetary, baroclinic waves and other long-term oscillations) is mixed up with turbulence. Our purpose is to study the effects of climate changes on these two components separately by applying a wavelet analysis to the 700 hPa wind fields obtained in climate simulations for different forcing scenarios. We study the coherent component of the signal via a correlation analysis to detect the persistence of large-scale or long-lasting structures, whereas we use the theory of autoregressive moving-average stochastic processes to measure the spectral complexity of the turbulent component. Under strong anthropogenic forcing, we detect a significant climate change signal. The analysis suggests that coherent structures will play a dominant role in future climate, whereas turbulent spectra will approach a classical Kolmogorov behaviour.
Type de document :
Article dans une revue
Earth System Dynamics, European Geosciences Union, 2016, 7, pp.517 - 523. 〈10.5194/esd-7-517-2016〉
Liste complète des métadonnées

Littérature citée [42 références]  Voir  Masquer  Télécharger

https://hal-cea.archives-ouvertes.fr/cea-01493854
Contributeur : Dimitri Defrance <>
Soumis le : mercredi 22 mars 2017 - 11:39:44
Dernière modification le : jeudi 15 mars 2018 - 15:05:26
Document(s) archivé(s) le : vendredi 23 juin 2017 - 12:42:08

Fichier

esd-7-517-2016.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Citation

Davide Faranda, Dimitri Defrance. A wavelet-based approach to detect climate change on the coherent and turbulent component of the atmospheric circulation. Earth System Dynamics, European Geosciences Union, 2016, 7, pp.517 - 523. 〈10.5194/esd-7-517-2016〉. 〈cea-01493854〉

Partager

Métriques

Consultations de la notice

107

Téléchargements de fichiers

58