A study of shallow cumulus cloud droplet dispersion by large eddy simulations

被引:0
作者
Xiaofeng Wang
Huiwen Xue
Wen Fang
Guoguang Zheng
机构
[1] Peking University,Department of Atmospheric Sciences, School of Physics
[2] Chinese Academy of Meteorological Sciences,undefined
[3] China Meteorological Administration,undefined
来源
Acta Meteorologica Sinica | 2011年 / 25卷
关键词
cloud droplet dispersion; shallow cumulus cloud; large eddy simulations; aerosol effect on climate; entrainment;
D O I
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中图分类号
学科分类号
摘要
Cloud droplet dispersion is an important parameter in estimating aerosol indirect effect on climate in general circulation models (GCMs). This study investigates droplet dispersion in shallow cumulus clouds under different aerosol conditions using three-dimensional large eddy simulations (LES). It is found that cloud droplet mean radius, standard deviation, and relative dispersion generally decrease as aerosol mixing ratio increases from 25 mg−1 (clean case) to 100 mg−1 (moderate case), and to 2000 mg−1 (polluted case). Under all the three simulated aerosol conditions, cloud droplet mean radius and standard deviation increase with height. However, droplet relative dispersion increases with height only in the polluted case, and does not vary with height in the clean and moderate cases.
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页码:166 / 175
页数:9
相关论文
共 27 条
[1]  
Albrecht B. A.(1989)Aerosols, cloud microphysics, and fractional cloudiness Science 245 1227-1230
[2]  
Deng Z. Z.(2009)Statistical analysis of microphysical properties and the parameterization of effective radius of warm clouds in Beijing area Atmos. Res. 93 888-896
[3]  
Zhao C. S.(2000)Spectral dispersion of cloud droplet size distributions and the parameterization of cloud droplet effective radius Geophys. Res. Lett. 27 1903-1906
[4]  
Zhang Q.(2002)Anthropogenic aerosols-indirect warming effect from dispersion forcing Nature 419 580-581
[5]  
Huang M. Y.(2000)Cloud droplet size distributions in low-level stratiform clouds J. Atmos. Sci. 57 295-311
[6]  
Ma X. C.(2003)Sensitivity of the first indirect aerosol effect to an increase of cloud droplet spectral dispersion with droplet number concentration J. Climate. 16 3476-3481
[7]  
Liu Y. G.(1998)Preferential concentration of cloud droplets by turbulence: Effects on the early evolution of cumulus cloud droplet spectra J. Atmos. Sci. 55 1965-1976
[8]  
Daum P. H.(2003)A large eddy simulation intercomparison study of shallow cumulus convection J. Atmos. Sci. 60 1201-1219
[9]  
Liu Y. G.(1974)Pollution and planetary albedo Atmos. Environ. 8 1251-1256
[10]  
Daum P. H.(1977)Influence of pollution on shortwave albedo of clouds J. Atmos. Sci. 34 1149-1152