DOI: 10.1175/JCLI-D-11-00563.1
Scopus记录号: 2-s2.0-84865463788
论文题名: Evaluation of microphysics parameterization for convective clouds in the NCAR community atmosphere model CAM5
作者: Song X. ; Zhang G.J. ; Li J.-L.F.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 24 起始页码: 8568
结束页码: 8590
语种: 英语
Scopus关键词: Aerosol effect
; Aerosol loading
; Cloud droplet activation
; Cloud liquid water path
; Community atmosphere model
; Convective clouds
; Convergence zones
; Cumulus cloud
; Explicit treatments
; Ice nucleation
; Large-scale precipitation
; Low-level clouds
; Mass mixing ratio
; Microphysical process
; Microphysics
; Microphysics parameterization
; Model evaluation
; Negative bias
; Number concentration
; Physically based
; Precipitation distribution
; Realistic simulation
; Stratiform clouds
; Subtropical ocean
; Western Pacific
; Aerosols
; Climate models
; Clouds
; Parameterization
; Physics
; Thermodynamics
; Precipitation (meteorology)
; aerosol
; climate modeling
; cloud microphysics
; convective cloud
; cumulus
; intertropical convergence zone
; parameterization
; precipitation (climatology)
; Pacific Ocean
英文摘要: A physically based two-moment microphysics parameterization scheme for convective clouds is implemented in the NCAR Community Atmosphere Model version 5 (CAM5) to improve the representation of convective clouds and their interaction with large-scale clouds and aerosols. The explicit treatment of mass mixing ratio and number concentration of cloud and precipitation particles enables the scheme to account for the impact of aerosols on convection. The scheme is linked to aerosols through cloud droplet activation and ice nucleation processes and to stratiform cloud parameterization through convective detrainment of cloud liquid/ice water content (LWC/IWC) and droplet/crystal number concentration (DNC/CNC). A 5-yr simulation with the new convective microphysics scheme shows that both cloud LWC/IWC and DNC/CNC are in good agreement with observations, indicating the scheme describes microphysical processes in convection well. Moreover, the microphysics scheme is able to represent the aerosol effects on convective clouds such as the suppression of warm rain formation and enhancement of freezing when aerosol loading is increased. With more realistic simulations of convective cloud microphysical properties and their detrainment, the mid- and low-level cloud fraction is increased significantly over the ITCZ-southern Pacific convergence zone (SPCZ) and subtropical oceans, making it much closer to the observations. Correspondingly, the serious negative bias in cloud liquid water path over subtropical oceans observed in the standard CAM5 is reduced markedly. The large-scale precipitation is increased and precipitation distribution is improved as well. The long-standing precipitation bias in the western Pacific is significantly alleviated because of microphysics- thermodynamics feedbacks. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52107
Appears in Collections: 气候变化事实与影响
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作者单位: Scripps Institution of Oceanography, La Jolla, CA, United States; Jet Propulsion Laboratory, Pasadena, CA, United States
Recommended Citation:
Song X.,Zhang G.J.,Li J.-L.F.. Evaluation of microphysics parameterization for convective clouds in the NCAR community atmosphere model CAM5[J]. Journal of Climate,2012-01-01,25(24)