The INFN Raman LIDAR aerosol measurements at CTAO North and its future deployment at CTAO South

Abstract For the pre-production phase of Cherenkov Telescope Array Observatory (CTAO), the INFN Raman Lidar (IRL) has collected vertical profiles of aerosol optical properties in the UV region at Roque de los Muchachos Observatory (ORM) up to December 2022, in automatic and unattended mode. A survey of the atmospheric aerosol climatology will be presented together with an overview of case studies. The IRL is currently at our laboratory in L’Aquila (Italy): an overview about the status of the upgrades (already implemented and ongoing) to improve its performances before its deployment at the CTAO South site, is also presented.