Oceanological studies of the russian sectors of the baltic sea in the year 2023

E. S. Bubnova; Бубнова Е. С.; V. V. Sivkov; Сивков В. В.; A. A. Muratova; Муратова А. А.; S. A. Mosharov; Мошаров С. А.; K. D. Korobchenkova; Коробченкова К. Д.; I. Yu. Dudkov; Дудков И. Ю.; I. V. Mosharova; Мошарова И. В.; A. A. Polukhin; Полухин А. А.; S. V. Aleksandrov; Александров С. В.; A. Yu. Artamonov; Артамонов А. Ю.

doi:10.31857/S0030157424050129

Oceanological studies of the russian sectors of the baltic sea in the year 2023

Authors: Bubnova E.S.¹^,2, Sivkov V.V.¹, Muratova A.A.¹^,2, Mosharov S.A.¹^,2, Korobchenkova K.D.¹^,2, Dudkov I.Y.¹^,2, Mosharova I.V.¹, Polukhin A.A.¹, Aleksandrov S.V.¹, Artamonov A.Y.³
Affiliations:
1. Shirshov Institute of Oceanology, Russian Academy of Sciences
2. Immanuel Kant Baltic Federal University
3. A.M. Obukhov Institute of Atmospheric Physics of the Russian Academy of Sciences
Issue: Vol 64, No 5 (2024)
Pages: 850-852
Section: Информация
URL: https://journals.rcsi.science/0030-1574/article/view/281557
DOI: https://doi.org/10.31857/S0030157424050129
EDN: https://elibrary.ru/OFIDJJ
ID: 281557

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Abstract

The environmental monitoring of the Russian sectors of the Baltic Sea was continued through three expeditions t in 2023: the 55^th cruise of the P/V “Akademik Sergei Vavilov” (April), the 54^th and 55^th cruises of the R/V “Akademik Boris Petrov” (November and December, respectively). Seasonal quantitative estimates of hydrological-hydrochemical and hydrobiological parameters, carbon dioxide fluxes at the water-air interface were obtained, and the geological and geomorphological conditions of the study areas were clarified. Influence of the Neva River to the eastern part of the Gulf of Finland was stable in all seasons and could be traced at a distance of up to 30 nautical miles from the Neva Bay. The South-Eastern Baltic bottom layer experienced extensive hypoxia and mosaic euxunia. Significant aeration of bottom waters occurred in December due to the combined influence of seasonal convection and downwelling resulting from a series of storms. In both study areas, high values of integral primary production were obtained in April, which were two orders of magnitude higher than the December values. The concentration of chlorophyll “a”, accordingly, differed by an order of one magnitude. The Gulf of Finland was an emitter of carbon dioxide into the atmosphere, especially in April, while the South-Eastern Baltic absorbed carbon dioxide in April and was an area of weak emissions in November and December.

Keywords

South-Eastern Baltics, Gulf of Finland, hypoxia, anoxia, primary production, bacterial production, carbon dioxide flux, chlorophyll “a”