Temporal variations of the transmission coefficient and aerosol optical depth of the atmosphere are considered using multi#x2010;year observations at the Soviet polar stations in the Arctic. The contribution of atmospheric aerosol to the total extinction of solar radiation is estimated. A decreasing trend of atmospheric transparency due to the increase of aerosol contributing to the extinction of solar radiation during the last 25#x2013;30 years is noted. Estimates of the atmospheric aerosol influence on the incoming solar radiation indicate that a further systematic decrease of the transmission coefficient may lead to climatic changes of direct and total radiation in most polluted areas of the Arctic.
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