
1) Discrete ordinate
Found on
https://www.crosswordclues.com/clue/disort

DISORT (Discrete Ordinates Radiative Transfer Program for a Multi-Layered Plane-Parallel Medium) - general and versatile plane-parallel radiative transfer program applicable to problems from the ultraviolet to the radar regions of the electromagnetic spectrum. DISORT is used in many atmospheric radiative transfer codes including Streamer, MODTRAN,...
Found on
http://en.wikipedia.org/wiki/DISORT

acronym: discrete ordinate (model)
Found on
https://www.encyclo.co.uk/local/20002
No exact match found.