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Brief results of oceanological studies in the south-eastern Baltic Sea and Gulf of Finland on cruise 54 of the R/V Akademik Sergey Vavilov (2022) are presented. Hydrological, hydro- and geochemical, hydrobiological, geoecological, geological, and geophysical studies were carried out. New data on the state and dynamics of the Baltic Sea natural complexes under conditions of increasing anthropogenic pressure and climate change were obtained. [ABSTRACT FROM AUTHOR]

Brief results of comprehensive studies of the southeastern Baltic Sea on cruises 47–49 of the R/V Akademik Boris Petrov (2021–2022) are presented. Research methods included geophysics, geology, paleogeography, hydrology, hydro- and geochemistry, hydrobiology, and geoecology. New data on paleolandscapes and parameters of long-term monitoring of spatiotemporal changes in the abiotic and biotic components of the Baltic Sea ecosystem were obtained. [ABSTRACT FROM AUTHOR]

The paper presents brief results of comprehensive studies of the water area of the Tatar Strait and Sea of Japan obtained on cruise 61 of the R/V "Akademik Oparin" in November–December 2020. The bottom relief and geophysical and gas-geochemical fields were refined, and new features of the geochemistry and mineralogy of bottom sediments were revealed. [ABSTRACT FROM AUTHOR]

Abstract—The paper gives brief results of comprehensive studies in the South China Sea obtained from a joint Russian–Vietnamese expedition in November 2019 (cruise 88 of the R/V "Akademik M.A. Lavrentyev"). The set of methods included acoustics, geophysics, geology, mineralogy,geochemistry, paleogeography, geomicrobiology, hydrooptics and hydrology. The seafloor relief, geophysical and gasgeochemical fields have been refined; new features of the geochemistry and mineralogy of the continental shelf of Vietnam and the adjacent deep-sea basins have been revealed. [ABSTRACT FROM AUTHOR]