Skip to main content

Biographical Memoirs Volume 68 (1995) / Chapter Skim
Currently Skimming:

Jacob Aall Bonnevie Bjerknes
Pages 3-22

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.


From page 3...
... It was Jack's father, the famous physicist and geophysicist Vilhelm Bjerknes, who set the stage for the research leading up to this discovery, but Jack was the principal performer. FAMILY BACKGROUND The name Bjerknes comes from a family farm in southeastern Norway where some of Jack's ancestors livecI.
From page 4...
... With this theorem, Vilhelm Bjerknes realized that he now was in possession of the complete set of hyciroclynamic/thermoclynamic equations that govern the motion of nonhomogeneous fluids. Encouraged by his Swedish colleagues, among them the famous chemist Svante Arrhenius en c!
From page 5...
... In cooperation with his Carnegie assistants, the Swecle Johan Sancistrom, ant! the Norwegians Olaf Devik and Theoclor Hesselberg, he published a substantial work, Dynamic Meteorology and Hydrography.
From page 6...
... As the war went on, the situation for the Leipzig Geophysics Institute worsened, with lack of labor and food shortages. Through the intervention of the Norwegian oceanographers Fridtjof Nansen anct Bj0rn HelIand-Hansen, a professorship was established for Vilhelm Bjerknes in Bergen in western Norway.
From page 7...
... Furthermore, Jack stated in his paper that warm air ascends along the sloping frontal sur· faces, causing bancis of clouds and precipitation to form along the fronts, whereas the coicI air sinks en cl spreads out along the ground. He notecl that these vertical motions represent a reduction of the potential energy, which couIcI account for the formation of the cyclone's kinetic energy, in agreement with MarguTes's theory publishecl fifteen years earlier.
From page 8...
... ~ . ~ , , ~ ~ / ~ ~ ado ~ ~ ~ Cold: TFo~~ ~ Cold ~> u~ ale eri\, line FICLRE 1 jack Weakness cyclone model ~reamUnes, clouds, and precipF tadon and verOca1 cros~secdons north and south of the center.
From page 9...
... is born as Solberg's initial wave on the polar front, develops into Jack Bjerknes's ideal cyclone, and finally suffers the Rer~eroni~n orcl,,sion death." It is noteworthy, however, that many of the features of the life cycle of cyclones were already contained in Jack's original paper, which he wrote in the fall of 1918. In 1920 Jack Bjerknes was appointed head of the Weather Forecasting Office for western Norway.
From page 10...
... front at the ground, and the vorticity connected with this trough was correctly ascribed to vertical stretching as the warm air descends cold front surface. clown the sloping This is the first attempt toward a dynamic treatment of the upper wave.
From page 11...
... Godske ant! Jack wrote an interesting paper together on instability of fronts; and Godske wrote the greater part of an extensive volume titled Dynamic Meteorology and Weather Forecasting, coauthored by Gociske, Bergeron, Jack Bjerknes, and R
From page 12...
... One cannot say they solved the problem, but they threw new light on it, and their work inspirer! their first cloctoral stuclent, Jule Charney, to come out with the first mathematical solution describing growing waves on a baroclinic current.
From page 13...
... meridional fluxes of angular momentum and energy en cl many other statistics. The results verifier!
From page 14...
... Jack first took up the study of the warming of the North Atian tic Ocean at the beginning of the century and found that it could be explained by an increased wind drag that speecled up the Gulf Stream. The interannual variations of the sea surface temperature in the North Atlantic were his next study subject.
From page 15...
... rainfall locally in the region of warm sea surface. But lack also looked for manifestations of a strengthened HacIley circulation, and he found an increased west winc3 in the northern Pacific, with distant effects on the weather in North America en cl possibly also in Europe.
From page 16...
... G Wurtele (Selected Papers of Jacob Call Bonnevie Bjerknes, Western Periodicals Co., North Hollywood, Calif., 1975~.
From page 17...
... Olav, 1947 Vega Medal, Swedish Society of Geography, 1958 International Meteorological Organization Prize, World Meteorological Organization, 1959 Carl-Gustaf Rossby Award, American Meteorological Society, 1960 Robert M Losey Award, Institute of Aerospace Sciences, 1963 President, Meteorological Association, International Union of Geodesy and Geophysics, 1948-51 National Medal of Science, 1966 Honorary Member and Fellow, American Meteorological Society, 1966 Honorary Doctor of Laws, University of California, 1967 Member, Royal Norwegian Academy of Sciences, Royal Swedish 17 Academy of Sciences, Danish Academy of Technical Sciences, Academy of Sciences (India)
From page 18...
... Life cycle of cyclones and the polar front theory of atmospheric circulation. Geofys.
From page 19...
... A 7:41-46. 1955 The transfer of angular momentum in the atmosphere.
From page 20...
... In Proceedings of the Symposium on the Arctic Heat Budget and Atmospheric Circulation, Lake Arrowhead, Calif., Jan.
From page 21...
... : 2 1 2- 1 7 . 1974 Atmospheric Teleconnections from the Equatorial Pacific During 1963-67.


This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More information on Chapter Skim is available.