Abstract
The paper presents a comprehensive analysis of hydrometeorological changes at the river basins of the North-East of Russia for the period 1966-2015. Data from 61 meteorological stations showed an increase in the air temperature by an average of 2.3 °C and multidirectional changes in annual precipitation. Most stations are characterized by a significant negative trend of precipitation in winter and a positive annual trend of mixed and liquid precipitation with an increase in their share in autumn months. The presence of statistically significant positive streamflow trends in the autumn-winter period was established for 51 hydrological gauges. We hypothesize that the increase in the low flow is mainly due to the transition of precipitation type from solid to liquid and corresponding increase of runoff in September, continuing in the following months.
Highlights
As a result of climate changes, there are pronounced transformations of the hydrological regime, which affect the territory of the North-East of Russia [1].In general the Arctic territory is characterized by an increase in total water flow in the second half of the XX century
The North-East region is characterized by a significant increase in air temperatures, especially during the transitional autumn-spring periods
It was found that most of the stations are characterized by a significant negative trend of precipitation in the winter
Summary
In general the Arctic territory is characterized by an increase in total water flow in the second half of the XX century. These assessments are based on the streamflow data at large river basins [2]. Changes in the flow of small and medium-sized rivers in the North-East were studied insufficiently. The purpose of this study was to quantify current changes in the river flow of the mountain part of the Kolyma, Yana, Indigirka, Alazeya River basins, Chukotka rivers and rivers of the Okhotsk sea as well as climate characteristics for the period from 1966 to 2015
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