TY JOUR TI Variability of Primary Productivity as an Initial Link in Carbon Flux Under the Influence of Hydrological Conditions in the Baltic Sea KW primary productivity KW carbon flux KW photosynthetic efficiency KW active chlorophyll fluorescence KW frontal zone KW Baltic Sea JO Russian Journal of Earth Sciences AU Mosharov, S.A. AU Mosharova, I.V. AU Borovkova, K.A. AU Bubnova, E.S. PY 2024 IS 24 PB Geophysical Center of the Russian Academy of Sciences