Current changes in water resources in Lena River basin

The effect of climate on the present-day formation conditions of the regimes of annual and base runoff in Eastern Siberia rivers and changes in those regimes are studied. The significant climate warming in Eastern Siberia in recent decades is shown to be accompanied by not only an increase in air temperature and some increase in precipitation, but also by a considerable changes in the annual and seasonal values of river and groundwater runoff. Hydrometeorological data are used to analyze variations in the mean annual and mean base runoff over the entire observation period divided into subperiods of 1940-1969 and 1970-2005. Plots, diagrams, and tables are constructed for the most representative gauges. The zoning of the territory by the runoff formation conditions was carried out and new estimates were derived for total water resources and natural groundwater resources for 1970-2005 with the construction of maps in ArcMap program.