• Plot gamma size distributions for an effective radius of 10 µm and effective variances of 0.01, 0.05, 0.1, 0.15. (Petra, Heiner)

• Perform Mie calculations for wavelengths from 100 to 10000 nm for the different gamma distributions. Plot the real and the imaginary part of the refractive index, the extinction coefficient, the asymmetry parameter, and the single scattering albedo.

Important: Please change in mie.c line 674 to

 radmax = 5.00 * input.r_eff_max; 

and line 684 to

 dx=0.03; 

and recompile in order to speed up the calculations!

Here is an input file for a Mie calculation including a size distribution (please see the libRadtran user manual for detailed description of the options:

mie.inp

mie_program MIEV0     # use Mie program MIEV0 by Wiscombe
refrac water          # use refractive index of water
r_eff 10              # Specify effective radius 
wavelength  wvl.dat   # File including wavelengths to be calculated
distribution GAMMA 7  # Specify gamma distribution with veff=1/(GAMMA+3)

A file including the wavelengths for the calculations: wvl.dat The mie tool is executed as follows:

 mie < mie.inp > mie.out

Describe the results!