Trends in the occurrence of thaws in the Arkhangelsk region
The frequency of occurrence of thaws within the calendar winter is analyzed for the territory of the Arkhangelsk region. It is revealed that they are most often observed in December and are less often observed in January. The calculation of the linear trend coefficients for the number of thaw days for the period of 1977-2017 and over the past 20 years shows that there is a trend towards an increase in the number of days with thaws in December and February, and it has increased over the past 20 years. In January there is a tendency toward the reduction of the number of days with thaw. The atmospheric circulation pattern for these periods is considered. The dependence of the occurrence of thaws on a particular atmospheric circulation pattern is studied. The influence of thaws on the regional economy and economic activity of population is demonstrated.