Spectra calculations in central and wing regions of CO₂ IR bands. IV: Software and database for the computation of atmospheric spectra

In the preceding companion papers a model, based on the impact and the Energy-Corrected Sudden approximations, was proposed for the calculation of the absorption shape of CO₂ in both central and wing regions of infrared bands. It was successfully tested using laboratory measurements as well as atmospheric transmission and emission spectra in the 10-20 μm interval. In the present paper, this approach is used to generate a set of suitable parameters and FORTRAN software for the calculation of absorption by CO₂ under atmospheric conditions which can be easily included in radiance/transmission computer codes. This package which includes all bands of significant contribution to atmospheric spectra, is an extension, now accounting for all P, Q, and R lines, of the tools proposed previously for Q branches only. Comparisons between balloon-borne limb emission stratospheric spectra and the results of forward calculations confirm the quality of the tools proposed.