International Polarized Radiative Transfer

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==== Case A 4: Aerosol - spheroidal particles  ====	

//Setup//:

  * same settings as [[intercomparisons:a3_aerosol_sperical|case A3]] but for spheroidal aerosol particles 
  * aerosol optical thickness: 0.2
  * aerosol optical properties: {{:intercomparisons:phase_a:sizedistr_spheroid.cdf|netCDF}},{{:intercomparisons:phase_a:sizedistr_spheroid.dat|ascii}} \\ The variable "phase" includes the phase matrix, as a function of the scattering angle (variable "theta"). The 4x4 scattering phase matrix for spherical droplets has four non-zero elements, which are stored in the following order: $ P = \begin{pmatrix} P1 &  P2 &  0 & 0 \\ P2 & P5 & 0 & 0 \\ 0 & 0 & P3 & P4 \\ 0 & 0 & -P4 & P6 \end{pmatrix} $ \\ The corresponding Legendre polynomials ("pmom") and the single scattering albedo ("ssa") are also included in the file.
  {{ :intercomparisons:phase_a:spheroids.png?900 |}}
The expansion moments over generalized spherical functions for the phase matrix have been provided by S. Korkin and are available {{:intercomparisons:phase_a:XK_A4.txt|here.}} 
  * no molecules
  * surface albedo: 0
  * transmittance at bottom and reflectance at top of layer
  * solar zenith angle //sza//: 40°
  * solar azimuth angle //saa//: 0°
  * viewing zenith angles 
    * at bottom: //vza//: 0° - 80°, 5° increment
    * at top:    //vza//: 100° - 180°, 5° increment  
  * viewing azimuth angle //vaa//: 0° - 180°, 5° increment  
  
//Output format://
  * The output should be provided in the same format as for case A1 ([[intercomparisons:a1_rayleigh|Rayleigh scattering]]).

 
=== Results ===

//Difference plots// between the models IPOL, 3DMCPOL, SPARTA (previously named TROPOS), SHDOM, PSTAR and MYSTIC for the full radiation field:\\
{{:intercomparisons:phase_a:a4:diff_a4_3dmcpol.pdf|3DMCPOL}}\\
{{:intercomparisons:phase_a:a4:diff_a4_ipol.pdf|IPOL}}\\
{{:intercomparisons:phase_a:a4:diff_a4_tropos.pdf|SPARTA}}\\
{{:intercomparisons:phase_a:a4:diff_a4_shdom3.pdf|SHDOM}}\\
{{:intercomparisons:phase_a:a4:diff_a4_pstar.pdf|PSTAR}}\\

//Data// of all models (MYSTIC and 3DMCPOL include also standard deviation):\\
{{:intercomparisons:phase_a:a4:iprt_case_a4_mystic.dat|MYSTIC}}\\	 
{{:intercomparisons:phase_a:a4:iprt_case_a4_3dmcpol.dat|3DMCPOL}}\\
{{:intercomparisons:phase_a:a4:iprt_case_a4_ipol.dat|IPOL}}\\
{{:intercomparisons:phase_a:a4:iprt_case_a4_tropos.dat|SPARTA}}\\
{{:intercomparisons:phase_a:a4:iprt_case_a4_shdom3.dat|SHDOM}}\\
{{:intercomparisons:phase_a:a4:iprt_case_a4_pstar.dat|PSTAR}}\\