Niels Johan Føyn

Niels Johan Føyn, original surname Nielsen (February 23, 1860 – June 13, 1945) was a Norwegian meteorologist.

Niels Johan Føyn
Niels Johan Føyn (back row, left), before 1892
Born
Niels Johan Nielsen

(1860-02-23)February 23, 1860
Slagen, Tønsberg, Norway
DiedJune 13, 1945(1945-06-13) (aged 85)
NationalityNorwegian
OccupationMeteorologist

Føyn was born in Slagen in the municipality of Tønsberg, Norway.[1][2] He was the son of the ship operator Peder Nielsen (1818–1904) and he later adopted the surname Føyn from the oeconym of the farm where his family lived.[2] He received his candidatus realium degree in 1886 and then worked as an assistant at the Norwegian Meteorological Institute.[1] He received a state scholarship to study in Berlin and Vienna from 1893 to 1895.[1] From 1903 to 1915, Føyn was the supervisor of the Bergen Meteorological Observatory,[3] and from 1915 to 1928 he was the deputy director of the Norwegian Meteorological Institute.[1] He was made a member of the Norwegian Academy of Science and Letters in 1904.[1]

Legacy

In meteorology, a Köppen-like formula known as Føyn's formula is used for calculating monthly mean temperatures:[4][5]

Tm = Tg + k(T2 − Tg)

where Tm = monthly mean temperature, Tg = monthly mean of T1 (morning temperature) and T3 (evening temperature), k = constant, and T2 = midday temperature.[6]

Selected works
  • "Meteorologi" (Meteorology; as N. J. Nielsen, in Henrik Jæger (ed.), Illustreret norsk literaturhistorie, 1896)[2]
  • Wolken-Beobachtungen inn Norwegen 1896–97 (Cloud Observations in Norway 1896–97; 1900)[1][7]
  • "Abhängigkeit des Barometerstandes von den Terrainverhältnissen" (Dependence of Barometer Readings on Terrain Conditions; in Meteorologische Zeitschrift, 1910)[1]
  • "Das Klima von Bergen, I. Niederschläge" (The Climate Of Bergen. Part 1: Precipitation; in Bergens Museums aarbok, 1910), "II. Lufttemperatur" (Part 2: Air Temperature; ibid., 1916)[1][8]
  • "Norges Klima" (Norway's Climate; in Norge 1814–1914, 1915)[1]
  • "Klima von Nordwesteuropa und den Inseln von Island bis Franz-Josef-Land" (The Climate of Northwest Europe and the Islands from Iceland to Franz Josef Land; coauthored with Bernt Johannes Birkeland, in Handbuch der Klimatologie, vol. 3, 1932)

References
  1. Blangstrup, Christian (1920). Salmonsens Konversationsleksikon, vol. 9. Copenhagen: J. H. Schultz Forlagsboghandel. p. 293. Retrieved December 2, 2018.
  2. Steenstrup, Hjalmar (1934). Hvem er hvem. Oslo: H. Aschehoug & Co. Retrieved December 2, 2018.
  3. Bergens Museums aarbog. Bergen. 1905. p. 97.{{cite book}}: CS1 maint: location missing publisher (link)
  4. Nordli, Øyvind; Tveito, Ole Einar (2008). Calculation of Monthly Mean Temperature by Köppen's Formula in the Norwegian Station Network (PDF). Oslo: Norwegian Meteorological Institute. p. 9. Retrieved December 2, 2018.
  5. Birkeland, Bernt Johannes (1936). "Mittel und Extreme der Lufttemperatur". Geofysiske Publikasjoner. 14 (1).
  6. Gjelten, Herdis M.; Nordli, Øyvind; Grimenes, Arne A.; Lundstad, Elin (2014). "The Ås Temperature Series in Southern Norway–Homogeneity Testing and Climate Analysis". Bulletin of Geography – Physical Geography Series. 7: 10. doi:10.2478/bgeo-2014-0001. S2CID 52026933. Retrieved December 2, 2018.
  7. Fortschritte der Physik. Braunschweig: F. Vieweg und Sohn. 1902. p. 325.
  8. "Meteorologiske forhold". Statistiske Oversikter 1948. Oslo: Statistisk sentralbyrå: 16. 1948.
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