TY JOUR TI Reproducing the Variability of the Thermal State of Lake Ladoga in 1980--2020 Based on Two Models of Thermohydrodynamics KW Intra-annual and interannual variability KW temperature KW ice KW modeling KW satellite and in situ observations KW Lake Ladoga JO Russian Journal of Earth Sciences AU Ryabchenko, V.A. AU Isaev, A.V. AU Konik, A.A. AU Golosov, S.D. AU Zverev, I.S. PY 2026 IS 26 PB Geophysical Center of the Russian Academy of Sciences