Knut Ångström
Template:Short description Template:More footnotes needed Template:Infobox scientist Knut Johan Ångström (12 January 1857Template:Snd4 March 1910) was a Swedish physicist. He was the son of physicist Anders Jonas Ångström and studied in Uppsala from 1877 to 1884, when he received his licentiat-degree, before going for a short time to the University of Strassburg (Strasbourg) to study with August Kundt. Coming back to Uppsala, he completed his doctoral degree and was appointed lecturer in physics at the new university college in Stockholm (now Stockholm University) in 1885. After a few years working there, he returned to Uppsala in 1891 and received the professorship of Physics in 1896.<ref name="EB1911"/>
He focused his research work on investigating the radiation of heat from the sun,<ref>Template:Cite journal</ref> terrestrial nocturnal emission and its absorption by the Earth's atmosphere,<ref>Template:Cite journal</ref> and to that end devised various delicateTemplate:Clarify methods and instruments, including his electric compensation pyrheliometer,<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> invented in 1893, apparatus for obtaining a photographic representation of the infra-red spectrum (1895)<ref name="EB1911">{{#if: |
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}}{{#ifeq: ||}}</ref> and pyrgeometer<ref>Interview With Dr Anders K. Ångström (Knut's son), WMO Bulletin 1982 "an excellent opportunity for me to use my father's radiation instruments, the pyrheliometer and the instrument for measuring outgoing nocturnal radiation to which I had already given the name pyrgeometer"</ref> (abt. 1905).
In 1900, Herr J. Koch, laboratory assistant to Knut Ångström, did not observe any appreciable change in the absorption of infrared radiation by decreasing the concentration of Template:CO2 up to a third of the initial amount.<ref>Template:Cite journal</ref> This result, in addition to the observation made a couple of years before that the superposition of the water vapour absorption bands,<ref>Template:Cite journal</ref> more abundant in the atmosphere, over those of CO2, convinced some geologists for a time that calculations by Svante Arrhenius for Template:CO2 warming were wrong; though subsequent work in following decades eventually partially vindicated Arrhenius.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>Template:Cite journal</ref> Arrhenius and Ångström were both qualitatively correct and both were quantitatively wrong.
The experiment, however, was careless seen from the current perspective with erroneous result<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> but of a historical significance in the development of the theory of the greenhouse effect amplified by CO2.
He was elected a member of the Royal Swedish Academy of Sciences in 1893.
References
- Ångström K, 1900, "Ueber die Bedeutung des Wasserdampfes und der Kohlensäure bei der Absorption der Erdatmosphäre", Annalen der Physik Bd 3. 1900, p720-732. http://www.realclimate.org/images/Angstrom.pdf