Аннотация:On the basis of improved series of annual and monthly water runoff at 73 gauges on rivers flowing into the seas of the Russian Arctic, long-term series (for 1936-2022) of annual inflow of river waters into the Arctic seas were obtained and the total annual runoff was estimated at 2,775 km3, the runoff from individual sections of the sea coasts, at the closing gates and in the mouths of the main rivers. It was found that the average annual runoff to the seas increased by 238 km3 per year, or 8.9%, compared with 1936-1988, and 1989 should be considered the general turning point. The proven increase is provided by the same trends in annual runoff fluctuations in almost all rivers in the catchments of the Arctic seas, with the exception of rivers in the northeast of the country, and mainly positive trends in seasonal runoff fluctuations. The statistical structure of long-term fluctuations in annual runoff has been studied. It is shown that water management activities practically do not affect the long-term dynamics of annual runoff (with the exception of the Yenisei River), but changed the water regime of many rivers regulated by reservoirs, including the largest ones.
