Vertical profiles from Rodríguez-Ovalle et al. (2024). Left: mean latitudinal temperature profiles for certain polar latitudes. The temperature profiles have been derived between 100 and 0.01 mbar. Right: mean latitudinal C₂H₂ abundance profiles for the same latitudes. The abundance profiles have two degrees of freedom peaking at 5 and 0.1 mbar and have been retrieved using different a priori profiles, depending on the homopause location.