In the north of Western Siberia, natural outcrops of marine Eopleistocene sediments are described. Eopleistocene age is confirmed by SIS-chemostratigraphic studies of samples. For this time, the gradual regression and desalination with the buffing was reconstructed. This is evidenced by the thin-stratification of deposits, the disappearance of foraminifera and marine mollusks and the appearance of brackish and freshwater algae and ostracods. According to the spore-pollen data, Eopleistocene time was warm, coniferous and coniferous-deciduous forests grew on the banks.

New methods for automated determination of sea ice cover features based on satellite data and upgraded method of short-term forecast of ice conditions based on numerical model “ocean-ice” are considered. The characteristic of the developed new software tools is given. The description of the experimental hardware-software complex of satellite monitoring and forecasting of ice conditions, consisting of five subsystems is presented.

Aerobic and anaerobic bacteria from the permafrost of King George Island, Schirmacher, Larsemann, Banger oases and Hobbs Coast have been cultured. Based on the qualitative and quantitative composition of the cultivated community of samples, a comparative analysis of the biodiversity of marine, lake and fluvioglacial deposits of different geocryological conditions and age was made.

Measurements of the attenuation of the electromagnetic waves in fresh water of Lake Ladoga by sounding of the inclined plane installed in the pool are discussed in this paper. GPRs “OKO-2” and “Zond 12e” were used in the investigations. The resistivity of the water was 22 Ω·m at a temperature of about 24°C. According to the results of the measurements the attenuation of the electromagnetic waves at a frequency of 400 MHz is 21 dB/m; of 900 MHz are 38 dB/m and 40 dB/m for different series of experiments, and at a frequency of 1500 MHz is 48 dB/m.

The article continues the series of publications, describing the modern climate of atmospheric surface layer in the Northern Yakutia and, in details, in the area of Tiksi Hydrometeorological observatory. Climatic characteristics of minimal and maximal air temperatures are estimated with data of standard meteorological measurements, executed at 22 marine and continental meteorological stations in 1978–2010 years, and at HMO Tiksi — during 1936–2015 years. These estimates supplement the information of climatic reference books, based on the data executed before 1980 year, and for some meteorological stations — before 1965 year. The basic characteristics of extremes by months, maps of its spatial distribution and conjugation, annual extremes (the largest and smallest values, its distributions by months, and trends), climatic parameters of seasonal amplitude, and estimates of extreme temperatures, possible one time during 5, 10, 50 and 100 years periods are presented. In addition, the synoptic conditions of storms and sharp temperature changes are investigated.

We realized lineament analysis of the relief and the shores of lakes for NW part of the Putoran plateau. As a result identifi ed next features of morphology: compliance with the directions the shores of large lakes and linear forms of relief; prevalence sublatitudinal linear relief in W and S parts of the area, and diagonal linear relief — in N and NE parts; high degree of randomness of the directions of the primary relief lines; good expression of the 4 directions of lineaments systems; conformity lineament systems of the area to planetary regmatic network.

Ice wedges could be sources of negative magnetic anomalies due to their low magnetic susceptibility in comparison with surrounding frozen ground. This allows their mapping using highprecision magnetic survey. The work dedicated to analyze of typical models of polygonal-wedge structures in cryolithic zone. Total magnetic field anomalies are calculated at elevations of 1–5 m above the ice wedges upper boundary level. Ice wedge width varies from 1 to 3 m while polygon sizes vary from 6 to 15 m, respectively. Magnetic susceptibility of frozen ground assumed equal to 10–3 SI. Calculated anomalies magnitude amounts from several nT to several tens of nT. Provided estimations allows defining a necessary survey precision for ice wedge mapping. Ice wedges more than 3 m wide are observable in anomalous magnetic field even in the case of covering deposits thickness of up to 4 m on the condition that covering layers are laterally relatively uniform and magnetic susceptibility of frozen ground is about 10–3 SI.

Based on the interpretation of geophysical and geological data, the authors compiled the Map of cryogenic geodynamics of the shelf of the Barents and Kara Seas, where six basic types of the structure of the cryolithozone section were identified. The relationship between the dynamics of the cryolithozone and the geomorphological, lithological, and geothermal characteristics of the shelf of the Barents and Kara seas is analyzed. Based on the results of this analysis, conclusions have been drawn on the relationship between the current state of the layer of permafrost and multiyear-cooled rocks with the depth of their bedding, thickness, surface temperature, type and lithological composition of the deposits of the cryolithozone itself and its enclosing rocks. Steady correspondence of the stable state of the frozen zone to the fl at elevated areas of the relief (plateau) was revealed, and unstable to the lowered relief areas (syneclises and gullies). The results of the analysis make it possible to predict the degree and position in the section of defrosting of cryolithozone in different parts of the study area.