DOI: 10.1175/JCLI-D-16-0556.1
Scopus记录号: 2-s2.0-85019063110
论文题名: A simple model of the life cycle of mesoscale convective systems cloud shield in the tropics
作者: Roca R. ; Fiolleau T. ; Bouniol D.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 11 起始页码: 4283
结束页码: 4298
语种: 英语
Scopus关键词: Budget control
; Degrees of freedom (mechanics)
; Geostationary satellites
; Range finding
; Satellite imagery
; Sustainable development
; Tropics
; 1 Degree of freedom
; Convective clouds
; Meso-scale systems
; Mesoscale Convective System
; Microphysical process
; Morphological characteristic
; Propagation characteristics
; Regional variability
; Storms
英文摘要: Mesoscale convective systems (MCSs) are important to the water and energy budget of the tropical climate and are essential ingredients of the tropical circulation. MCSs are readily observed in satellite infrared geostationary imagery as cloud clusters that evolve in time from small structures to well-organized large patches of cloud shield before dissipating. The MCS cloud shield is the result of a large ensemble of mesoscale dynamical, thermodynamical, and microphysical processes. This study shows that a simple parametric model can summarize the time evolution of the morphological characteristics of the cloud shield during the life cycle of the MCS. It consists of a growth-decay linear model of the cloud shield and is based on three parameters: the time of maximum extent, the maximum extent, and the duration of the MCS. It is shown that the time of maximum is frequently close to the middle of the life cycle and that the correlation between maximum extent and duration is strong all over the tropics. This suggests that 1 degree of freedom is left to summarize the life cycle of the MCS cloud shield. Such a model fits the observed MCS equally well, independent of the duration, size, location, and propagation characteristics, and its relevance is assessed for a large number of MCSs over three boreal summer periods over the whole tropical belt. The scaling of this simple model exhibits weak (strong) regional variability for the short- (long-) lived systems indicative of the primary importance of the internal dynamics of the systems to the large-scale environment for MCS sustainability. © 2017 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49649
Appears in Collections: 气候变化事实与影响
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作者单位: Laboratoire d'Etudes en Géophysique et Océanographie Spatiales, Université de Toulouse III, CNRS, CNES, IRD, Toulouse, France; Centre National de la Recherche Météorologique-GAME, Météo-France, Toulouse, France; CNRS, Toulouse, France
Recommended Citation:
Roca R.,Fiolleau T.,Bouniol D.. A simple model of the life cycle of mesoscale convective systems cloud shield in the tropics[J]. Journal of Climate,2017-01-01,30(11)