Abstract
Smoke emitted from forest fires in northern California in September 1987 was trapped in a valley by an inversion for 3 weeks. Daily maximum temperatures on the valley floor were more than 15.degree.C below normal for 1 week and more than 5.degree.C below normal for 3 weeks. The smoke strengthened the inversion by preventing surface warming by solar radiation, thereby enhancing the smoke trapping and the surface cooling in a positive feedback loop. These results may have implications for nuclear winter.

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