Brief review of my previous work in Beijing. Xiaofeng Wang Directed by : Guoguang Zheng Huiwen Xue. Two parts. A study of shallow cumulus cloud droplet dispersion by large-eddy simulations Wang, X., H. Xue , W. Fang, and G. Zheng , Acta Meteorologica Sinica , 2011(25), 166-175.
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Brief review of my previous work in Beijing
Directed by :
Wang, X., H. Xue, W. Fang, and G. Zheng, ActaMeteorologicaSinica, 2011(25), 166-175.
Xiaofeng Wang, Thesis for master degree, 2011
Actually, I think my previous work is just some simple academic practice.
where H: physical thickness of cloud；ρw :water density；LWC: liquid water content；CDNC:cloud droplet number concentration，β is related to cloud spectrum.
and droplet collision- coalescence.
Mean radias, standard deviation and relative dispersion decrease with increasing aerosol loading.
This is similar to another LES results but for Sc. (Lu et al., 2007)
Collision-Coalescence takes effect.
Aerosol has insignificant effects on relative dispersion in larger AF regions.
The results are similar to the LES results for Sc. (Lu and Seinfeld, 2006)
In large AF regions, effective radius is large, standard deviation is small, and relative dispersion is small.
kEis extinction coeffecient，
QEis extinction effeciency ( 2, for low clouds)。
More aerosols induce large cloud optical depth.
The difference between detailed calculation and parameterization is slight.
Result: Weather on Apr.18, 2011
Short wave trough
Surffient water vapor
Low pressure center
Particle radius is lower than 25μm.
Weather on May 1, 2009
Radius is lower than 50μm
Aerosol effects on microphysics
Radius is lower than 25μm
Vertical profiles of properties of cloud spectrum
Standard deviation keeps constant;
04-18, vary little with height;
04-18, decrease with height;
05-01, increase with height.
As aerosol concentration increases, CCN and CDNC increase.
As aerosol concentration increases，standard deviation, mean radius, and relative dispersion decreases. The range of their variations also narrows.
These results are very consistent with others observed in North China. (Zhao et al., 2006; Deng et al, 2009)