The Unix tar file contains the thermal radiative transfer model, RTSPEC,
written by Frank Evans, Merritt Deeter, and Aaron Evans at the
University of Colorado.  This model rapidly computes unpolarized
radiance spectra in the atmosphere.  

The model is written in a variant of Fortran 77 which allows long
subroutine and variable names and the use of ENDDO in DO loops. We have
used the code for a while and tested by comparing to a multi-stream
model, but be on the look out for minor bugs and problems with
documentation.  Please send me bug reports and suggestions. 

The distribution is available from http://nit.colorado.edu.  This Web
site also contains a Postscript version of a journal article describing
the hybrid radiative transfer model.


The following is a list of the files:

 rtspec.f          radiative transfer program (documentation at beginning)
 sscatmie.f        Mie scattering table program
 mieoindsub.f        subroutines for sscatmie

 makefile          Unix makefile for compiling rtspec and sscatmie

 runrtspec         csh script to run rtspec for computing radiance spectra

 abs_mw_mls.dat    absorption file for microwave (0 to 33 cm^-1) 
                     for midlatitude summer standard atmosphere (up to 25 km)
                     calculated from HITRAN96 with O16O17 abundance fixed
 icesphrmw.scatab  Mie scattering table for microwave 
                     (median ice sphere diameters from Dme=10 to 1000 micron)
 mls_clear.out     clear sky output from runrtspec script 
 mls_cloud1.out    cloudy sky output from runrtspec script 


If you use this model I would appreciate you sending me e-mail telling
me about it.  Comments and suggestions are welcome.  

    Frank Evans           July 2001
    Program in Atmospheric and Oceanic Sciences
    University of Colorado, Boulder 80309-0311
    evans@nit.colorado.edu     (303) 492-4994