DOI: 10.1175/JCLI-D-16-0050.1
Scopus记录号: 2-s2.0-85008603829
论文题名: Improvements in global climate model microphysics using a consistent representation of ice particle properties
作者: Eidhammer T. ; Morrison H. ; Mitchell D. ; Gettelman A. ; Erfani E.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 2 起始页码: 609
结束页码: 629
语种: 英语
Scopus关键词: Atmospheric radiation
; Climate models
; Clouds
; Parameterization
; Bulk particle density
; Cloud forcing
; Cloud microphysics
; Cloud radiative forcing
; Community atmosphere model
; Ice crystals
; Microphysical process
; Tuning of parameters
; Ice
; climate modeling
; cloud microphysics
; global climate
; ice crystal
; parameterization
英文摘要: This paper describes a new approach for representing ice microphysics in climate models. In contrast with most previous schemes, this approach does not include separate categories for cloud and precipitating ice and instead uses a single two-moment category to represent all solid hydrometeors. Thus, there is no need for an ice "autoconversion" size threshold parameter, which has a critical impact on simulated climate in the Community Atmosphere Model (CAM5) yet is poorly constrained by theory or observations. Further, in the new treatment, all ice microphysical processes and parameters, including ice effective radius and mean fall speed, are formulated self-consistently and flexibly based on empirical ice particle mass-size and projected area-size relationships. This means that the scheme can represent the physical coupling between bulk particle density, mean fall speed, and effective radius, which is not possible in current schemes. Two different methods for specifying these relationships based on observations are proposed. The new scheme is tested in global simulations using CAM5. Differences in simulations using the two methods for specifying the mass- and projected area-size relationships, particularly the cloud radiative forcing, are attributable mainly to the effects on mean ice particle fall speed, impacting sedimentation and ice water path. With some tuning of parameters involved in calculating homogeneous freezing it produces a similar climate compared to the simulations using the original CAM5 microphysics. Thus, it can produce a comparable climate while improving the physical basis and self-consistency of ice particle properties and parameters. © 2017 American Meteorological Society. 资助项目: NASA, National Aeronautics and Space Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49799
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; Division of Atmospheric Sciences, Desert Research Institute, Reno, NV, United States
Recommended Citation:
Eidhammer T.,Morrison H.,Mitchell D.,et al. Improvements in global climate model microphysics using a consistent representation of ice particle properties[J]. Journal of Climate,2017-01-01,30(2)