DOI: 10.1002/2015MS000571
Scopus记录号: 2-s2.0-84959576864
论文题名: Physical mechanisms controlling the initiation of convective self-aggregation in a General Circulation Model
作者: Coppin D ; , Bony S
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 7, 期: 4 起始页码: 2060
结束页码: 2078
语种: 英语
英文关键词: Atmospheric temperature
; Boundary layers
; Heat convection
; Oceanography
; Surface measurement
; Surface properties
; Surface waters
; Temperature distribution
; Cloud feedbacks
; Cloud radiative effects
; General circulation model
; Intermediate temperatures
; Radiative-convective equilibrium
; Sea surface temperature (SST)
; Self aggregation
; Temperature dependence
; Agglomeration
; aggregation
; cloud radiative forcing
; convective boundary layer
; convective cloud
; general circulation model
; sea surface temperature
; troposphere
英文摘要: Cloud-resolving models have shown that under certain conditions, the Radiative-Convective Equilibrium (RCE) could become unstable and lead to the spontaneous organization of the atmosphere into dry and wet areas, and the aggregation of convection. In this study, we show that this "self-aggregation" behavior also occurs in nonrotating RCE simulations performed with the IPSL-CM5A-LR General Circulation Model (GCM), and that it exhibits a strong dependence on sea surface temperature (SST). We investigate the physical mechanisms that control the initiation of self-aggregation in this model, and their dependence on temperature. At low SSTs, the onset of self-aggregation is primarily controlled by the coupling between low-cloud radiative effects and shallow circulations and the formation of "radiatively driven cold pools" in areas devoid of deep convection, while at high SSTs it is primarily controlled by the coupling between surface fluxes and circulation within convective areas. At intermediate temperatures, the occurrence of self-aggregation is less spontaneous and depends on initial conditions, but it can arise through a combination of both mechanisms. Through their coupling to circulation and surface fluxes, the radiative effects of low-level clouds play a critical role in both initiation mechanisms, and the sensitivity of boundary layer clouds to surface temperature explains to a large extent the temperature dependence of convective self-aggregation. At any SST, the presence of cloud-radiative effects in the free troposphere is necessary to the initiation, growth, and maintenance of convective aggregation. © 2015. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75946
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Sorbonne Universités, UPMC Univ Paris 06, CNRS, LMD/IPSL, Paris, France
Recommended Citation:
Coppin D,, Bony S. Physical mechanisms controlling the initiation of convective self-aggregation in a General Circulation Model[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,7(4)