Ecological Systems and Devices Annotation << Back HYDROLOGICAL CHARACTERISTICS OF WATER MASSES IN THE FRISE STRAIT A.A. Moskvitin, E.A. Tikhonchuk The features of the hydrological characteristics of water masses in the Frise Strait, are obtained as a result of the analysis of the field data. It is made a comparison of the hydrological characteristics (temperature, salinity, density, speed of sound) at different depths. The water masses of the Sea of Okhotsk and the Pacific Ocean intensively interact and mix in the straits of the Kuril Islands. Changes of the hydrological characteristics are shown in the regions of the Pacific Ocean and the Sea of Okhotsk, adjacent to the Kuril Islands, and directly in the Frise Strait. The nature of the boundaries of the Pacific and Okhotsk water masses in the Frise Strait is refi ned. The obtained results confirm the information previously presented in the scientific literature about the formation of the intermediate layer of the Sea of Okhotsk due to the mixing of the oceanic and sea waters. Keywords: hydrological characteristics, Sea of Okhotsk, water masses, intermediate layer, salinity, temperature. DOI: 10.25791/esip.8.2022.1310 Pp. 03-09.