TY JOUR TI Methane in the Water Column of the Gdansk Deep (Baltic Sea): Seasonal and Vertical Variability KW dissolved methane KW carbon supersite KW thermohaline conditions KW hypoxia JO Russian Journal of Earth Sciences AU Ulyanova, M.O. AU Korneeva, A.O. PY 2024 IS 24 PB Geophysical Center of the Russian Academy of Sciences