Figure 1. Example occultation spectra of CO2 and
H2O bands measured by ACS NIR and the retrieved profiles
for occultation 4154 in MY34 (Ls=278°, latitude:55°S, longitude 317°E,
local time 3:06). A) synthetic spectra of CO2 and
H2O absorptions (target altitude of 20 km); the ranges
corresponding to measured diffraction orders are marked by vertical
bars. B) observed (black) and best fit model (magenta) transmittances in
order 49 at 35 km with residual. C) observed (black) and best fit model
(blue) transmittances in order 54 at 35 km with residual. D) observed
(black) and best fit model (red) transmittances in order 56 at 35 km
with residual. Lower panels show profiles retrieved from this
occultation: (E) temperature in Kelvin from order 49 (magenta) and 54
(blue), (F) CO2 density in cm-3 from
the same orders and (G) water vapor mixing ratio in ppmv from order 56
with saturation ratio (black) calculated as explained in Section 2.3.