The assimilation code and the photochemical box model are described in Khattatov et al., Assimilation of photochemically active species and a case analysis of UARS data., J. Geophys. Res., 104, 18,715-18,737, 1999. The code is written in Fortran 90 and was shown to run under Tru64 Unix (Digital Unix), AIX, IRIS, andLinux. You have to have netCDF library and gmake on your system in order to run it.
Click on the link below to download zip file containing the code and the data.