Features of the hydrology conditions changeability in the northeast Japan Sea in summer

Using the hydrological and meteorological data of the fifty-year observations in La Perouse Strait and adjacent part of the Japan Sea, the authors investigated the peculiarities of thermohaline structure of waters. It was revealed the dependence of waters structure formation on changeability of the water exchange and atmospheric processes. The observations show the relationship between the abnormal hydrological conditions in the North-Eastern part of the Japan Sea and the Okhotsk anticyclone and the Okhotsk sea water intrusion, due to deep cyclones passing over the area in summer. A sharp change of thermal conditions has negative impact on hydrobionts.