TY JOUR TI Steric Oscillations of the Baltic Sea Level KW sea level KW steric oscillations KW thermosteric component KW halosteric component KW linear trends KW harmonic analysis KW seasonal variability KW freshwater balance components JO Russian Journal of Earth Sciences AU Zakharchuk, E.A. AU Sukhachev, V.N. AU Tihonova, N.A. AU Litina, E.N. PY 2023 IS 23 PB Geophysical Center of the Russian Academy of Sciences