Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 70668 10.2205/2024ES000888 yczuci ОРИГИНАЛЬНЫЕ СТАТЬИ ORIGINAL ARTICLES ОРИГИНАЛЬНЫЕ СТАТЬИ Variability of Primary Productivity as an Initial Link in Carbon Flux Under the Influence of Hydrological Conditions in the Baltic Sea Variability of Primary Productivity as an Initial Link in Carbon Flux Under the Influence of Hydrological Conditions in the Baltic Sea https://orcid.org/0000-0002-0055-8982 Мошаров Сергей Александрович Mosharov Sergey Aleksandrovich sampost@list.ru

кандидат биологических наук;

candidate of sciences in biology;

 https://orcid.org/0000-0003-1166-8228 Мошарова Ирина Викторовна Mosharova Irina Viktorovna ivmpost@mail.ru https://orcid.org/0009-0009-7810-2529 Боровкова Кристина Андреевна Borovkova Kristina Andreevna https://orcid.org/0000-0002-8168-2984 Бубнова Екатерина Сергеевна Bubnova Ekaterina Sergeevna Институт океанологии имени П.П. Ширшова РАН Москва Россия Shirshov Institute of Oceanology Moscow Russian Federation Балтийский федеральный университет им. Иммануила Канта Immanuel Kant Baltic Federal University Институт океанологии им. П.П. Ширшова РАН Москва Россия Shirshov Institute of Oceanology of Russian Academy of Sciences Moscow Russian Federation Балтийский федеральный университет им. Иммануила Канта Россия Immanuel Kant Baltic Federal University Russian Federation Институт океанологии им. П.П. Ширшова РАН Россия Shirshov Institute of Oceanology of Russian Academy of Sciences Russian Federation 20 05 2024 20 05 2024 24 2 1 14 04 10 2023 11 12 2023 https://rjes.ru/en/nauka/article/70668/view

Investigating variability in phytoplankton primary productivity as a key component of the “biological pump” is critical to quantifying flux in the marine environment. We hypothesized that under certain hydrological conditions, changes in phytoplankton productivity are greater with changes in photosynthetic efficiency (the ratio of primary production (P P ) to the rate of electron transport in the phytoplankton photosystem, P P /ETR) than with changes in chlorophyll content. This study showed that increase of P P during sharp changes in hydrological parameters in the temporary frontal South-East Baltic (SEB) is achieved by increasing the efficiency of photosynthesis, i.e., the degree of use of light energy captured by chlorophyll a (Chl a). In the Gulf of Finland (GF), an increase in P P followed an increase in salinity from the Neva mouth to the sea and controls chlorophyll contents with low variability in photosynthetic efficiency. For SEB and GF, measurements of parameters of phytoplankton productivity and chlorophyll a content in late autumn (November) are carried out. The first stage of carbon flow (in biological pump), expressed in terms of primary production, was higher in the SEB than in the GF

Investigating variability in phytoplankton primary productivity as a key component of the “biological pump” is critical to quantifying flux in the marine environment. We hypothesized that under certain hydrological conditions, changes in phytoplankton productivity are greater with changes in photosynthetic efficiency (the ratio of primary production (P P ) to the rate of electron transport in the phytoplankton photosystem, P P /ETR) than with changes in chlorophyll content. This study showed that increase of P P during sharp changes in hydrological parameters in the temporary frontal South-East Baltic (SEB) is achieved by increasing the efficiency of photosynthesis, i.e., the degree of use of light energy captured by chlorophyll a (Chl a). In the Gulf of Finland (GF), an increase in P P followed an increase in salinity from the Neva mouth to the sea and controls chlorophyll contents with low variability in photosynthetic efficiency. For SEB and GF, measurements of parameters of phytoplankton productivity and chlorophyll a content in late autumn (November) are carried out. The first stage of carbon flow (in biological pump), expressed in terms of primary production, was higher in the SEB than in the GF

 primary productivity carbon flux photosynthetic efficiency active chlorophyll fluorescence frontal zone Baltic Sea primary productivity carbon flux photosynthetic efficiency active chlorophyll fluorescence frontal zone Baltic Sea Data collection and preliminary processing was funded by the state assignment of SIO RAS (theme # FMWE-2024-0025). Analysis and interpretation of data on spatial distribution of relative electron transport rate, the maximum quantum efficiency of PSII, and primary production were supported by the state assignment of the IKBFU (theme # FZWM-2024-0015). Data collection and preliminary processing was funded by the state assignment of SIO RAS (theme # FMWE-2024-0025). Analysis and interpretation of data on spatial distribution of relative electron transport rate, the maximum quantum efficiency of PSII, and primary production were supported by the state assignment of the IKBFU (theme # FZWM-2024-0015).

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