Тенденции изменчивости химического состава речных вод Западно-Сибирской части Арктической зоны России : Trends in Chemical Composition variability of River Waters of the West Siberian Part of Arctic Zone, Russia

• Main Authors: Kondakova , Maria Yu., Kosmenko , Lyudmila S., Danilenko , Alesia O., Reshetnyak , Olga S.
• Format: Text
• Language: Russian
• Published: Southern Federal University 2019
• Subjects: river ecosystems; Arctic zone of Russia; trends; chemical composition; main ions; biogenic substances; organic substances; heavy metals; state of ecosystems; Arctic; Nadym; Nyda; Poluy; Sovetskaya; Yenisei River; Climate change
• Online Access: https://dx.doi.org/10.23683/0321-3005-2019-3-70-79; https://hub.sfedu.ru/repository/material/801270122/?direct_link=true

The study results of chemical substances variability tendencies in the river waters of the West Siberian part of the Arctic zone of Russia are presented. The assessment of the main trends in the temporal variability of the chemicals concentrations was made on the basis of the combination of correlation and regression analysis methods for long-term hydrochemical data. It is shown that increasing trends prevail among statistically significant for major ions and organic substances. This may be due to both anthropogenic factors and the intensification of chemical weathering processes as a result of global climate change. Among the detected trends in the variability of concentrations of biogenic substances and petroleum hydrocarbons in the rivers of the West Siberian part of the Russian Arctic, decreasing trends dominate. The watercourses of the Yenisei river basin constituted an exception among the regularities identified above. The long-term dynamics of concentrations of heavy metal compounds in river waters are multidirectional, that largely due to local factors in the formation of the chemical composition of the water of arctic rivers. The trend analysis' results allowed assessing the state of the river ecosystems of the studied part of the Russian Arctic by the degree of variability of the water composition and identify the Yenisei river ecosystem as the most stable. Ecosystems of the Ob, Pravaya Khetta, Taz, Sovetskaya river and Seda-Yakha rivers function in a transitional state. In the arctic parts of the Nyda, Poluy, Nadym and Pur rivers, the condition of river ecosystems is assessed as disturbed and additional anthropogenic impact may enhance the transformation of the chemical composition of their aquatic environment and lead to irreversible consequences.