Ecological Systems and Devices Annotation << Back Interdecadal Changes in the Thermohaline Structure and Density Stratifi cation of the Waters of the Sea of Okhotsk According to the International Climatological Atlas WOA23 Kurkin A.A., Kurkina O.E., Rouvinskaya E.A. Based on the temperature and salinity data for three climate normals (1971–2000, 1981–2010, 1991–2010) from the international hydrological atlas WOA23, interdecadal changes in the thermohaline structure and density stratification of the waters of the Sea of Okhotsk were investigated. It is shown that there is no pronounced time trend in changes in temperature, salinity, and density of seawater for the entire Sea of Okhotsk, but a general increase in average temperatures, reaching 0.3 °C and visible to a depth of 1000 m, over the period covering the three considered climate normals is observed. At the same time, multidirectional changes in temperature and salinity according to the data for three decades lead to interdecadal fluctuations of different signs for seawater density anomalies, and similar small changes in average densities and in the stratification index of seawater; these fl uctuations over the considered 30-year periods do not yet lead to a qualitative change in baroclinic wave regimes. Keywords: stratification by temperature, salinity and density of sea water; hydrological atlas; climate change; stratification index; baroclinic wave regimes. DOI: 10.25791/esip.9.2025.1543 Pp. 12-35.