LONG-TERM CHANGES OF SOLAR RADIATION IN THE TRANSBAIKAL REGION
It is noted that the observed global and regional climate change influence on different climatic characteristics. Many results of the studies show that, in solar radiation, coming to the earth's surface, which is one of the major climatic factors, there is a positive trend continuing in the last few years. The aim of this study is to identify long-term changes of solar radiation characteristics in the territory of Transbaikal region in conditions of climate changing. We used the data for the period from 1981 to 2013 of the actinometrical points of the Transbaikal department for Hydrometeorology and Environmental Monitoring about the medium-term average monthly values of diffuse radiation on a horizontal surface, and direct radiation on the surface perpendicular to the sun's rays. Within the Transbaikal region there are three such points: Borzya, Mangut and Chita. It is concluded that in the past three decades, there have been an increase in the annual value of the sum of direct solar radiation based on the solar radiation data from the points of the Transbaikal region. The values of total radiation have increased only due to the fact that there was an increase in scattered radiation values at one point (Chita), and in Borzya and Mangut - there was a reduction. The reduction of scattered radiation values has occurred in all months, while the values of direct radiation have increased, with the exception of April and May. The value of total radiation of the linear trend is positive in January-February and August-September and December. During the rest time the total radiation value has decreased. The long-term increase in annual direct solar radiation values is due, most likely, to the increasing duration of sunshine because the duration of sunshine and direct solar radiation are in dependence which is close to the directly proportional one