DOI: 10.1007/s00382-012-1303-6
Scopus记录号: 2-s2.0-84874945900
论文题名: An event-by-event assessment of tropical intraseasonal perturbations for general circulation models
作者: Duvel J.P. ; Bellenger H. ; Bellon G. ; Remaud M.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 40, 期: 2017-03-04 起始页码: 857
结束页码: 873
语种: 英语
英文关键词: Convective parameterization
; Coupled general circulation models
; Intraseasonal perturbations
; Madden Julian Oscillation
; Tropical variability
英文摘要: We detect and characterize each large-scale intraseasonal perturbation in observations (1979-2009) and in coupled general circulation models of Institut Pierre Simon Laplace (IPSL) and of Centre National de Recherches Météorologiques (CNRM). These ensembles of intraseasonal perturbations are used to assess the skill of the two models in an event-by-event approach. This assessment addresses: (1) the planetary-scale (i. e. the whole Indo-Pacific area) extent of wind and rainfall perturbations and the reproducibility of the perturbation patterns for a given season; (2) the size and amplitude of rainfall and wind anomalies at basin-scale (i. e. for a particular phase of the perturbation) and; (3) the evolution of the vertical structure of the perturbations (U, T and RH) for selected events. The planetary-scale extent of rainfall perturbations is generally too small for both models. This extent is also small for the wind perturbation in the IPSL model, but is correct, or even too large in boreal winter, for the CNRM model. The reproducibility of the planetary-scale patterns is exaggerated for wind perturbations in the CNRM model and is very poor for all parameters in the IPSL model. Over the Indian Ocean during boreal winter, rainfall and wind anomalies at basin-scale are too large for the CNRM model and too small for the IPSL model. The CNRM model gives a realistic baroclinic perturbations structure for wind, moisture and temperature, but with too large amplitude due in part to a zonally extended rainfall anomaly over the eastern Indian Ocean and the Maritime Continent. The IPSL model gives a realistic response for low-level wind only. Temperature and moisture perturbations are barotropic with a wrong warm anomaly at rainfall maximum and there is no gradual increase in low-level moisture prior to this rainfall maximum. These results suggest that this version of the IPSL model is unable to initiate the coupling between the convection and the dynamic necessary to develop the perturbation. It is difficult to say if this is due to, or is at the origin of the lack of basin-scale organization of the convection. We discuss the likely role of the convective schemes in the differences found between these two versions of the CNRM and IPSL models. © 2012 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54933
Appears in Collections: 过去全球变化的重建
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作者单位: Laboratoire de Météorologie Dynamique, Institut Pierre Simon Laplace, Ecole Normale Supérieure, Paris, France; Centre National de Recherches Météorologiques, CNRS/Météo France, Toulouse, France; Lab. d'Océanographie et du Climat, Expérimentation et Approches Numériques, Institut Pierre Simon Laplace, Université Pierre et Marie Curie, Paris, France
Recommended Citation:
Duvel J.P.,Bellenger H.,Bellon G.,et al. An event-by-event assessment of tropical intraseasonal perturbations for general circulation models[J]. Climate Dynamics,2013-01-01,40(2017-03-04)