LLLab DISORT Website

Welcome to the Light and Life Lab (LLLab) DISORT website.

DIScrete Ordinate Radiative Transfer (DISORT) is a software tool that solves the problem of 1d scalar radiative transfer in a single optical medium, such as a planatary atmosphere. The code correctly accounts for multiple scattering by an isotropic or plane-parallel beam source, internal Planck sources, and reflection from a lower boundary. Provided that polarization effects can be neglected, DISORT efficiently calculates accurate fluxes and intensities at any user-specified angle and location within the user-specified medium, and has been widely used in a variety of software tools and packages.
Please see the below documentation for details about the DISORT algorithm. This software is built and tested on Linux and Mac OS X using the free GCC gfortran compiler but should work on Windows as well.
We strongly recommend using the latest version of DISORT that is posted, but include older versions for comparison and validation purposes.

Packages:

DISORT 4

• DISORT 4.0.99
  -bugfix to pseudo-spherical correction
  disort4.0.99.zip
  

• DISORT 4.0.98
  -Delta-M+ implementation, which improves upon Delta-M truncation (optional)
  -dynamic memory allocation
  -a few minor, but nonetheless important bug fixes
  -much of the code is now in double precision but the input is still specified in single precision
  -better documentation on the ICBND option for efficiently calculating reflectivities and transmissivities, e.g. TOA fluxes
  -improved code formatting
  disort4.0.98.tar.gz
  disort4.0.98.zip
  

DISORT 3

• DISORT 3.0.84
  -includes pseudo-spherical correction (test problem 16)
  disort3.0.84.tar.gz
  disort3.0.84.zip
  

• DISORT 3.0.55
  -improved code formatting
  disort3.0.55.tar.gz
  disort3.0.55.zip

• DISORT 3.0.49
  disort3.0.49.tar.gz
  disort3.0.49.zip

DISORT 2

• DISORT 2.0 beta package with Makefile and compile script
  disort2.0beta.tar.gz

DISORT TWOSTR code

• Highly efficient 2 stream version of DISORT
  disort-twostr1.0.0.tar.gz
  disort-twostr1.0.0.zip

Documentation:

• DISORT paper

• DISORT Report v1.1

• Delta-M paper

• Radiative Transfer in the Atmosphere and Ocean, Stamnes, Thomas, and Stamnes

If you happen to find any bugs or have questions please email Knut Stamnes (kstamnes@stevens.edu) and Snorre Stamnes (snorre.a.stamnes@nasa.gov).

The original DISORT "gang" back in 1999.