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Smoke prevents the rain

18.05.2000

After studying data from a special satellite that measures the amount of clouds and precipitation in the Earth's tropical zone, Israeli geophysicist Daniel Rosenfeld came to the conclusion that smoke interferes with the formation of rain.

After severe forest fires in Indonesia in the spring of 1998, rainfall decreased in the area. The fact is that the rain begins when small droplets in the cloud merge into larger ones, which can no longer stay in the air and begin to fall. To do this, the droplets must be larger than 25-28 microns in diameter. However, smoke is made up of tiny soot particles, providing a convenient place for moisture to condense.

Droplets much smaller than necessary to start coalescence condense around the smoke particles and do not tend to coalesce. Rosenfeld believes that polluted city air also interferes with the formation of large water droplets in clouds.

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