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Methods for cosine correction of broadband UV data and their effect on the relation between UV irradiance and cloudiness
SMHI, Forskningsavdelningen, Atmosfärisk fjärranalys.
SMHI, Forskningsavdelningen, Atmosfärisk fjärranalys.
2000 (Engelska)Ingår i: Journal of Geophysical Research - Atmospheres, ISSN 2169-897X, E-ISSN 2169-8996, Vol. 105, nr D4, s. 4795-4802Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Irradiance measurements on a horizontal surface often deviate from theory where the irradiance is supposed to be proportional to the cosine of the angle of incidence. This discrepancy is known as the cosine error. In this paper, three different methods for cosine error correction are investigated. The simplest method is based on the assumption of an isotropic sky radiance distribution, regardless of sky conditions, and the irradiance is treated as a single component. In the second method the irradiance is divided into one direct solar and one diffuse sky component, where the latter is assumed to have an isotropic distribution. Finally, a third method also divides the irradiance into two components but under the assumption of an anisotropic sky radiance distribution. Irradiances under general sky conditions are found by interpolation between clear and overcast cases on the basis of sunshine duration or cloud cover. The three methods are applied to data from a Robertson-Berger sunburning meter located in Norrkoping, Sweden. Both methods, where the irradiance is divided into two components, produce acceptable and similar results, while the isotropic one-component method does not.

Ort, förlag, år, upplaga, sidor
2000. Vol. 105, nr D4, s. 4795-4802
Nationell ämneskategori
Meteorologi och atmosfärforskning
Forskningsämne
Fjärranalys
Identifikatorer
URN: urn:nbn:se:smhi:diva-1507DOI: 10.1029/1999JD900982ISI: 000085512800034OAI: oai:DiVA.org:smhi-1507DiVA, id: diva2:847069
Tillgänglig från: 2015-08-19 Skapad: 2015-08-17 Senast uppdaterad: 2017-05-12Bibliografiskt granskad

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Landelius, TomasJosefsson, Weine

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