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The present study is devoted to the analysis of extreme sea level oscillations of the Laptev Sea using the ADCIRC model. The numerical modeling is performed on a high-resolution grid and verified for sea level observations from three tide gauges. We have revealed regional characteristics of extreme sea level oscillations for different parts of the Laptev Sea coast. The maximum total sea level range was 544 cm in Ebelyakh Bay, while the minimum was 267 cm in Khatanga Bay, where maximum tidal ranges were obtained. Some areas in Khatanga Bay and Anabar Bay had maximum tidal ranges exceeding 200 cm. The study provided an estimation of the possible magnitude of coastal flooding by calculating the extreme total and residual sea levels for different return periods: 1, 2, 5, 10, 20, 50, and 100 years. The amplitude of extreme surges calculated for the 100-year return period can exceed 300 cm for several sections of the Laptev Sea coast, with the maximum sea level range being about 680 cm for Anabar and Ebelyakh Bays.

Seasonal dynamics of temperature and salinity at the standard depths is restored for the network of oceanographic stations on southeastern shelf of Sakhalin by the methods of statistical modeling (GIS Sakhalin Shelf) using the data base of ~40 years observations. Spatial fields of temperature and salinity are reconstructed by means of the oceanic model of the University of Bergen. Some new features of the oceanographic regime are revealed. Detailed annual cycles of temperature and salinity are determined for the first time that has allowed to calculate the mean month three-dimensional water circulation for all seasons, including the ice period.