(b. Godstone, England, 15 August 1891; d. Stockholm, 13 June 1977)
Swedish meteorologist, particularly noted for his work in cloud physics. He was a student of and collaborated with Vilhelm Bjerknes. He introduced the concept of air masses in 1928, studied frontal theory and the influence of upper-atmospheric processes on climate, and proposed the theory of precipitation later known as the Bergeron process.
Subjects: Meteorology and Climatology.