DOI: 10.1002/jgrd.50674
论文题名: A coarsening model for self-organization of tropical convection
作者: Craig G.C. ; MacK J.M.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 16 起始页码: 8761
结束页码: 8769
语种: 英语
Scopus关键词: Coarsening
; Mixing
; Moisture
; Troposphere
; Cloud-resolving model simulations
; Correlation lengths
; Influence of humidity
; Moisture distribution
; Radiative-convective equilibrium
; Total precipitation
; Tropical convection
; Tropical troposphere
; Computer simulation
; convection
; cumulus
; droplet
; humidity
; moisture content
; numerical model
; precipitation (climatology)
; tropical environment
; troposphere
英文摘要: If the influence of humidity on cumulus convection causes moist regions of the tropical troposphere to become moister and dry regions to become drier, and if horizontal mixing of moisture is not rapid enough to overcome this tendency, then the atmosphere will tend to separate into increasingly large moist and dry regions through a process of coarsening. We present a simple model for the moisture budget of the free troposphere, including subsidence drying, convective moistening, and horizontal mixing, and a constraint on total precipitation representing radiative-convective equilibrium. When initialized with a spatially uncorrelated moisture distribution, the model shows self-organization of precipitation with two main stages: A coarsening stage where the correlation length grows proportional to time to the power 1/2 and a droplet stage where precipitation is confined to a decreasing number of circular moist regions. A potential function is introduced to characterize the tendency for self-organization, which could be a useful diagnostic for analyzing cloud-resolving model simulations. © 2013. Her Majesty the Queen in Right of Canada. American Geophysical Union. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63402
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Meteorologisches Institut, Ludwig- Maximilians-Universität, Theresienstr. 37, 80333 Munich, Germany
Recommended Citation:
Craig G.C.,MacK J.M.. A coarsening model for self-organization of tropical convection[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(16)