TY CONF TI LIDAR MEASUREMENTS OF OPTICAL THICKNESS OF HIGH-LEVEL CLOUDS IN TOMSK KW atmosphere KW lidar KW clouds. JO The XXXI International Symposium "Atmospheric and Ocean Optics. Atmospheric Physics" AU Kohanenko, G.P. AU Balin, Y.S. AU Nasonov, S.V. AU Penner, I.E. PY 2025 PB V.E. Zuev Institute of Atmospheric Optics, Siberian Branch of the Russian Academy of Sciences