The Middle Ob is the part of the Ob river reach running through the central part of Western Siberia within Khanty-Mansi Autonomous Okrug, and brings its waters through the territory of Yamalo-Nenets Autonomous Okrug to the Gulf of Ob of the Arctic Ocean. The data on hydrochemical characteristics of the Middle Ob river and its anabranches during 2003-2008 and 2014-2018 in aspects of transboundary transfer is presented in the article. Composition of salt, organic compounds, heavy metals, petroleum hydrocarbons, biogenic ions in water and bottom sediments are described. The influence of oilfields and urban territories in water catchment area of the Middle Priobie is revealed. The main pollutants of the Middle Ob river are phenols, hydrocarbons, iron, manganese, chrome, cooper, phosphate-ions from technogenic and natural originating. We investigated that the level of the Middle Ob river water pollution was increased from 2003-2008 till 2014-2018.

There has been presented an assessment of dynamics of environmental weather factors in the phase space of states in the framework of stochastic regularities and the theory of chaos using the author's programs and its correlation with indices of patients’ primary appealability concerning climate-sensitive diseases through the example of the City of Surgut. It has been found that the indices of the population appeals for climate-sensitive diseases had a close positive relationship with the value of the volumes of behavioral quasi-attractors of the meteorological parameters in the annual dynamics.

No abstract

In the paper we examine and discuss the results of original research of dynamics of climatic and ecological factors by the example of northern urbanized KMAO – Yugra (Surgut and Surgut district) from the perspective of theory of chaos and self-organization. The peculiarities and laws of the dynamic behavior of a time trend of climate and ecologic factors as indicators of dynamic system are discovered, the most informative components of the abiotic factors in the long-term dynamics are identified.

No abstract