Study of the State and Variability of the Northwestern Japan Sea in the Autumn–Winter Period on Cruise 62 of the R/V Akademik Oparin

The results of research carried out on cruise 62 of the R/V Akademik Oparin from December 14 to 29, 2020 continued monitoring of the interannual variability of the Japan Sea water parameters, confirmed the long-term warming trend of bottom waters, revealed its slowdown during the last decade, demonstrated the formation of a cyclonic gyre in the northern part of the sea and development of upwelling, contributing to more intensive cooling of the sea surface layer. A detailed survey of a mesoscale eddy was carried out in the area of the Primorye Current. The hydrochemical parameters, zooplankton, and methane and tritium in various water structures were assayed. The mercury content in the atmospheric water layer was measured.