Abstract
We report three-dimensional calculations of regional and global climatic effects of smoke generated by a large-scale nuclear war. Tropospheric aerosols of absorption optical depth 3, when injected into Northern Hemisphere mid-latitudes and maintained for 1–3 weeks, cause intense radiative heating of the mid-troposphere with substantial surface cooling over land. Mid-latitude surface temperatures in continental interiors can drop well below freezing in a matter of days regardless of season. Our results, although based on several assumptions, suggest that circulation changes caused by aerosol-induced atmospheric radiative heating could spread the aerosols well beyond the altitude and latitude zones in which the smoke was initially generated.
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