IS THE RADIATION CLIMATE IN THE BALTIC SEA REGION CHANGING

At present, numerous studies are devoted to changes in the Earth's climate. Besides changes in temperature and precipitation regimes, changes in radiation transfer in the atmosphere and in the resulting radiation regime on the ground have been obvious. Based on the actinometric measurements data obtained at Toravere Actinometric Station (Estonia, 58-degrees 16'N, 26-degrees 28'E) during more than 30 years, long-term changes in radiation budget (net radiation) and its components are examined as well as changes in atmospheric transparency and cloudiness. The analysis has shown marked decreasing trends (significance by Student parameter p greater-than-or-equal-to 0.05) of direct solar radiation (14.1 %); global radiation ( 6.4%); reflected radiation (20.6%); and atmospheric transparency (3.7%). However, annual values of net radiation, its longwave component and low cloudiness, have increased during recent decades by 33.0%, 31.2% and 11%, respectively. Human activities are considered a possible reason for the trends described.