Jacob Bjerknes

Jacob Aall Bonnevie Bjerknes ( , Norwegian:; 2 November 1897 – 7 July 1975) was a Swedish-born Norwegian-American meteorologist. He is known for his key paper in which he pointed the dynamics of the polar front, mechanism for north–south heat transport and for which he was also awarded a doctorate from the University of Oslo.

Born in Stockholm, Sweden, he was the son of the Norwegian meteorologist Vilhelm Bjerknes, one of the pioneers of modern weather forecasting. He helped develop the Norwegian cyclone model. He earned a Ph.D. from the University of Oslo in 1924. Bjerknes supported the team that made the first crossing of the Arctic in the airship Norge. During WWII, he helped the US with the planning of the Hiroshima and Nagasaki atomic bombings. He also helped gain an understanding of the weather phenomenon El Niño.