PropGen Examples
The script run_propgen_example demonstrates the new system for
generating SHDOM optical property files. Scattering tables are made for
lognormal size distributions of spherical dust aerosols and gamma
distributions of water cloud droplets with make_mie_table, and
for gamma distributions of hexagonal plate and rough aggregate ice
crystals with make_ice_table. An example particle file
(nauru19990707.part) specifies the mass content and effective
radius distributions for a horizontally uniform aerosol layer (particle
type 1) from the surface to 1.4 km, a broken cumulus water cloud layer
(type 2) from 0.59 to 2.03 km, and a cirrus layer made of plates and
aggregates (types 3 and 4) from 8.75 to 14.75 km. The two-dimensional
(X-Z) cumulus and cirrus cloud distributions are derived from the ARM
millimeter-wave cloud radar on Nauru Island. The propgen
program reads the particle file and four scattering tables to generate
the optical properties file for SHDOM.
The distribution includes an IDL program "plot_propgen_example.pro"
which plots the components of the particle file, the resulting
extinction and single scattering fields, and radiance output from SHDOM.
The mass content and effective radius of the four particle types is
shown in these figures (click on on figure to enlarge):
Aerosol:
Cloud droplets:
Plate ice crystals:
Aggregate ice crystals:
Example phase functions for the four particle types are
shown for
1.64 microns wavelength.
The extinction and single scattering albedo is shown for
0.65 microns and
1.64 microns wavelength.
The optical depth and radiance for three directions is
plotted for
0.65 microns and
1.64 microns wavelength.
Last modified: June 19, 2003
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Cloud droplets:
Aggregate ice crystals:
