science · 15 August 1891 · 133 years ago
birth
Born 15 Aug 1891; died 13 Jun 1977 at age 85.
Tor Harold Percival Bergeron was a Swedish meteorologist best known for his work on cloud physics. He was the first meteorologist to take into account the upper atmospheric phenomena and their effect on climate. He demonstrated that raindrops can form in the upper parts of clouds, which contain little liquid water, through the growth of ice crystals. This happens at temperatures between -10°C and -30°C (14°F and -22°F) and is known as the Bergeron process. Work done in the 1930s by Tor Bergeron and W. Findeisen led to the concept that clouds may contain both supercooled water and ice crystals. This led further to the concepts of “warm rain” and “cold rain.”
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