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Tor Bergeron (August 15 1891 – June 13 1977) was the Swedishmarker meteorologist who proposed a mechanism for the formation of precipitation in clouds. In the 1930s, Bergeron and W. Findeisen developed the concept that clouds contain both supercooled water and ice crystals. According to Bergeron, most precipitation is formed as a consequence of water evaporating from small supercooled droplets and accreting onto ice crystals, which then fall as snow, or melt and fall as cold rain depending on the ambient air temperature. This process is known as the Bergeron Process, and is believed to be the primary process by which precipitation is formed.

Bergeron was one of the principal scientists in the Bergen School of Meteorology, whichtransformed this science by introducing a new conceptual foundation for understandingand predicting weather. While developing innovative methods of forecasting, the Bergenscientists established the notion of weather fronts and elaborated a new model ofextratropical cyclones that accounted for their birth, growth, and decay. Bergeron iscredited with discovering the occlusion process, which marks the final stage in the lifecycle of an extratropical cyclone.


A complete bibliography for Bergeron can be found in Liljequist (1981):

  • Liljequist, Gosta H. β€œTor Bergeron: A Biography.” Pure and Applied Geophysics 119 (1981): 409–442.

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