TY JOUR TI On a Possible Mechanism Forming the Nighttime Maximum of Urban Heat Island Intensity KW urban heat island intensity KW diurnal cycle KW ground surface heat flux KW ground surface temperature KW solar radiation KW thermal effusivity KW thermal inertia JO Russian Journal of Earth Sciences AU Demezhko, D.Y. AU Gornostaeva, A.A. AU Khatskevich, B.D. AU Fakaeva, N.R. PY 2026 IS 26 PB Geophysical Center of the Russian Academy of Sciences