“…Lanzhou, located in Northwest China, is a natural experimental site for studying aerosol radiative effects in semiarid region owing to its high pollution, radiation intensity, and aerosol absorption (Guan et al, 2021;Tang et al, 2024;Tian et al, 2023b;Xin et al, 2016), and sensitivity to climate change (Huang et al, 2017). Highresolution vertical profiles of absorbing aerosols and SSA were obtained from a month-long vertical-sounding experiment during winter at the Semi-Arid Climate and Environment Observatory of Lanzhou University (SACOL).…”