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A 1991 JQSRT article describes the
This tar file contains two polarized plane-parallel radiative transfer models written by Frank Evans at Colorado State University and the University of Colorado. The first is rt3 which is for randomly oriented particles (isotropic media) and includes solar and thermal sources of radiation. The second is rt4 which is for horizontally oriented particles (azimuthally symmetric media), but does only thermal sources. The rt3 model is described in K. F. Evans and G. L. Stephens, 1991: "A New Polarized Atmospheric Radiative Transfer Model", J. Quant. Spectrosc. Radiat. Transfer, v. 46, no. 5, pp. 413-423, 1991. The rt4 model is briefly described in Evans, K. F., and G. L. Stephens, 1995: "Microwave radiative transfer through clouds composed of realistically shaped ice crystals. Part II: Remote Sensing of Ice Clouds", J. Atmos. Sci., v. 52, 2058-2072. This latest version of rt3 and rt4 allows the radiances at any level in the input medium to be output. The output format has been changed to that the actual radiance is output for a specified number of azimuth angles, instead of outputting the Fourier series. The radiances may now be output as V and H polarization and/or brightness temperatures (the Planck function is always used internally now). Delta-M scaling may be specified for rt3. The models are written in a variant of Fortran 77 which allows long subroutine and variable names and the use of ENDDO in DO loops. The arrays are currently setup for a radiance vector length of 64 (e.g. 16 angles, 4 Stokes parameters). See the beginning of rt3.f and radtran3.f or rt4.f and radtran4.f for documentation on using the programs. The following is a list of the files: rt3.f main program, contains documentation at beginning radtran3.f RADTRAN subroutine with documentation at beginning radscat3.f subroutines radintg3.f " radutil3.f " radmat.f " rt4.f main program, contains documentation at beginning radtran4.f RADTRANO subroutine with documentation at beginning radscat4.f subroutines radintg4.f " radutil4.f " scatcnv.f program to convert scattering files from rt3 format (Legendre series in scattering angle) to rt4 format. runmietest Unix script to test rt3 with the Mie example from the paper. runtesta Unix script for a more general test of rt3. runtestr Unix script that does a test of rt4 with spherical raindrops. runtestc Unix script for a test of rt4 using oriented ice columns. If you use these models I would appreciate you sending me e-mail telling me about it. Comments and suggestions are welcome. Frank Evans July 3, 1996 Program in Atmospheric an Oceanic Sciences University of Colorado, Boulder firstname.lastname@example.org (303) 492-4994
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