A Study of Shallow Cumulus Cloud Droplet Dispersion by Large Eddy Simulations |
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Authors: | Xiaofeng Wang Huiwen Xue Wen Fang Guoguang Zheng |
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Institution: | Department of Atmospheric Sciences, School of Physics, Peking University, Beijing 100871;Department of Atmospheric Sciences, School of Physics, Peking University, Beijing 100871;Chinese Academy of Meteorological Sciences, Beijing 100081;China Meteorological Administration, Beijing 100081 |
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Abstract: | 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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Keywords: | cloud droplet dispersion shallow cumulus cloud large eddy simulations aerosol effect on climate entrainment |
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