DOI: 10.1002/2017MS000952
Scopus记录号: 2-s2.0-85028953494
论文题名: A single ice approach using varying ice particle properties in global climate model microphysics
作者: Zhao X ; , Lin Y ; , Peng Y ; , Wang B ; , Morrison H ; , Gettelman A
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期: 5 起始页码: 2138
结束页码: 2157
语种: 英语
英文关键词: Atmospheric radiation
; Climate models
; Parameterization
; Separation
; Snow
; Atmospheric simulations
; CAM5
; Cloud forcing
; Cloud microphysics
; Community atmosphere model
; Global climate model
; Microphysical process
; Nonspherical particle
; Ice
; climate forcing
; climate modeling
; cloud microphysics
; general circulation model
; global climate
; ice
; parameterization
; phase transition
; physical property
; radiative forcing
; snow
; spectrum
; water content
英文摘要: Ice and mixed-phase cloud representation and simulation in global climate models are challenging with large uncertainties and biases. Sharing similar growth paths, no distinct separation exists in nature between cloud ice and snow. Different from conventional microphysics schemes separating cloud ice from snow, a single prognostic category is used to represent the whole spectrum of solid hydrometeors. Instead of using fixed physical properties for separate ice classes, e.g., the mass, area, and fall velocity, we consider the particle shape and riming impacts on ice properties. This approach simplifies several ice-related microphysical processes and eliminates the ambiguity and uncertainty associated with parameterizing cloud ice to snow conversion. The modifications were implemented in the Morrison-Gettelman (MG08) scheme and tested in Community Atmosphere Model. Evaluation using single column simulations indicated that the new approach increased the ice water content (IWC) in high clouds during dry period, which is improved compared to available retrievals. Global atmospheric simulations using the new approach give an overall comparable mean climate with notable improvement in terms of clouds and their radiative forcing. Both longwave and shortwave cloud forcing are closer to observations due to more realistic IWC, liquid water content, and cloud top height. Furthermore, the new approach yields slightly better representation of mixed-phase clouds when a smaller capacitance for nonspherical particles is used in the ice depositional growth parameterization. Overall, the physically based single-ice approach is a promising direction for future GCM microphysics development given its simplified representation of microphysical processes and flexible description of ice particle properties. © 2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75734
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: Ministry of Education Key Laboratory for Earth System Modeling, Department of Earth System Science, and Joint Center for Global Change Studies (JCGCS), Tsinghua University, Beijing, China; National Center for Atmospheric Research, Boulder, CO, United States
Recommended Citation:
Zhao X,, Lin Y,, Peng Y,et al. A single ice approach using varying ice particle properties in global climate model microphysics[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(5)