Carbon Dioxide Retrievals From NOMAD?SO on ESA's ExoMars Trace Gas Orbiter and Temperature Profile Retrievals With the Hydrostatic Equilibrium Equation: 2. Temperature Variabilities in the Mesosphere at Mars Terminator

The Solar Occultation (SO) channel of the Nadir and for Mars Discovery (NOMAD) instrument scans Martian atmosphere since 21 April 2018. In this work, we present a subset NOMAD SO data measured at mesosphere. We focused on spectral range that started to be recorded in year (MY) 35. A total 968 vertical profiles carbon dioxide density temperature covering MY 35 beginning 36 were investigated until 135° solar longitude. compared 47 with co-located Climate Sounder onboard Reconnaissance Orbiter. Most show good agreement as temperatures are only 1.8 K higher, but some biases lead an average absolute difference 7.4°K. set is also simulations from Global Environmental Multiscale-Mars general circulation model. Both sets except presence cold layer winter hemisphere warm dawn Northern longitudes between 240° 360°. Five contain lower than limit CO2 condensation. Strong layers found 13.5% profiles. They mainly hemisphere, while dusks appear featureless. covers high latitudes around 60° derived non-migrating tides. Southern apparent zonal wavenumber-1 (WN-1) WN-3 tidal components maximum amplitude 10% 5% 63 km, respectively.