Abstract
A numerical experiment simulating the long-term consequence of a nuclear war, as a result of atmospheric pollution by dust an soot, was carried out at the Computing Centre of the Soviet Academy of Sciences, using a climatic model. The global, zonal and geographical distribution of the air-temperature changes in the vicinity of the underlying region, and the zonal mean of the vertical temperature gradient are assessed. The results obtained point to a sharp long-term drop in temperature above the continents of the Northern Hemisphere, and to a fundamental reconstruction of the hydrological cycle and atmosphere circulation.