Fig. 3

Expected features of the Mars atmosphere observed by MIRS. The synthetic spectra are calculated by the widely used DISORT-based radiative transfer model for Mars (Ignatiev et al. 2005). A typical condition of Mars atmosphere is assumed. The surface albedo of Mars is assumed to be 0.15 (uniform). The thick curves in the figure show the spectra for the clear sky condition, and the dashed curves include the effects of dust or water ice clouds. For gases, CO₂, CO, and water vapor are calculated separately (red, orange, and blue curves, respectively). The calculated synthetic spectra are convolved with the instrumental line shape of MIRS that is a Gaussian function whose FWHM is 20 nm. The sampling step is 10 nm