DOI: 10.1175/JCLI-D-14-00087.1
Scopus记录号: 2-s2.0-84907050064
论文题名: Integrating cloud processes in the Community Atmosphere Model, version 5
作者: Park S. ; Bretherton C.S. ; Rasch P.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 18 起始页码: 6821
结束页码: 6856
语种: 英语
Scopus关键词: Cloud process
; Community atmosphere model
; aerosol
; atmospheric modeling
; cloud droplet
; cloud microphysics
; concentration (composition)
; ice crystal
; marine atmosphere
; parameterization
; precipitation assessment
; radiation budget
; relative humidity
; stratocumulus
英文摘要: This paper provides a description of the integrated representation for the cloud processes in the Community Atmosphere Model, version 5 (CAM5). CAM5 cloud parameterizations add the following unique characteristics to previous versions: 1) a cloud macrophysical structure with horizontally nonoverlapped deep cumulus, shallow cumulus, and stratus in each grid layer, where each of which has its own cloud fraction, and mass and number concentrations for cloud liquid droplets and ice crystals; 2) stratus-radiation-turbulence interactions that allow CAM5 to simulate marine stratocumulus solely from grid-mean relative humidity without relying on a stability-based empirical formula; 3) prognostic treatment of the number concentrations of stratus liquid droplets and ice crystals, with activated aerosols and detrained in-cumulus condensates as the main sources and with evaporation, sedimentation, and precipitation of stratus condensate as the main sinks; and 4) radiatively active cumulus and snow. By imposing consistency between diagnosed stratus fraction and prognosed stratus condensate, unrealistically empty or highly dense stratus is avoided in CAM5. Because of the activation of the prognostic aerosols and the parameterizations of the radiation and stratiform precipitation production as a function of the cloud droplet size, CAM5 simulates various aerosol indirect effects as well as the direct effects: that is, aerosols affect both the radiation budget and the hydrological cycle. Detailed analysis of various simulations indicates that CAM5 improves upon CAM3/CAM4 in global performance as well as in physical formulation. However, several problems are also identified in CAM5, which can be attributed to deficient regional tuning, inconsistency between various physics parameterizations, and incomplete treatment of physics. Efforts are continuing to further improve CAM5. © 2014 American Meteorological Society. 资助项目: NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51469
Appears in Collections: 气候变化事实与影响
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作者单位: National Center for Atmospheric Research, Boulder, CO, United States; University of Washington, Seattle, WA, United States; Pacific Northwest National Laboratory, Richland, WA, United States
Recommended Citation:
Park S.,Bretherton C.S.,Rasch P.J.. Integrating cloud processes in the Community Atmosphere Model, version 5[J]. Journal of Climate,2014-01-01,27(18)