Introduction
The present Supporting Information describes details of the retrieval concept for the temperature, density and pressure altitude profiles from the transmission spectra measured by ACS MIR. Figure S1 demonstrates a validation of the ACS MIR temperature profiles with the analogous profiles of ACS NIR. We compare all individual profiles point-by-point, derived from simultaneous and collocated MIR and NIR observations. The ACS NIR data are taken from Fedorova et al. (2022). Figure S2 shows the six temperature profiles containing CO2 subfreezing points. Figure S3 shows the latitudinal cross-sections of CO2 density profiles observed by ACS MIR in both equinox seasons. Figure S4 shows sets of the temperature profiles containing a warm layer at 60-90 km in the morning relative to the evening terminators.