[RegCNET] How to calculate the SW optical parameters?

[suxingtao at sina.com]

Dear Fabien, Ashraf, Xunqiang and all RegCM users,

I am sorry to trouble you. Now I am studying the climatic effects of dust aerosols over East Asia. We all know that the dust shortwave optical parameters (asymmetry factor, single scattering albedo and mass extinction coefficient) which are obtained from Mie calculations are specified at 19 discrete spectral intervals in mod_aerosol.f90. 
Now I want to modify these parameters according to the complex refractive indices of East Asian dust aerosols in present RegCM4.0 model. In my opinion, in order to calculate the mass extinction coefficients, we should know the effective radius of each dust size-bin (0.01-1.0micron, 1.0-2.5micron, 2.5-5.0micron, 5.0-20.0micron). But I don’t know how to calculate the effective radius of each bin. Moreover, in order to calculate the asymmetry factor and single scattering albedo, we should know the weight of each bin. How to get the weight? If my opinion is wrong, how to calculate these three parameters?
I am grateful to you for any help. Thanks very much in advance.

 
Yours Sincerely, 
Xingtao Su
PLA University of Sci. and Tech., Nanjing, China
 
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