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Effect of clouds on UV irradiance: As estimated from cloud amount, cloud type, precipitation, global radiation and sunshine duration
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. 4927-4935Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Ten years of measurements of UV irradiance, monitored by the Robertson-Berger (RB) meter in Norrkoping, 58.58 degrees N, 16.15 degrees E, Sweden, have been combined with concurrent synoptic cloud observations, measurements of sunshine duration, and global radiation to establish the relative influence of clouds on UV irradiance. It is shown that the cloud effect for UV wavelengths is less than for the whole solar spectrum (global radiation). Relations retrieved for global radiation may be used by correcting for the differences. High-level clouds are more transparent than low- and medium-level clouds. As expected, it was found that precipitating clouds in general are more opaque than nonprecipitating clouds. If there is any solar elevation dependency in the effect of clouds, it is small. Using only total cloud amount as parameter to model, the cloud effect on UV irradiance will give a substantial uncertainty, which can be decreased considerably using cloud type and/or information on precipitation conditions. It has also been shown that sunshine duration can be used in a similar way as cloud covet.

Ort, förlag, år, upplaga, sidor
2000. Vol. 105, nr D4, s. 4927-4935
Nationell ämneskategori
Meteorologi och atmosfärforskning
Forskningsämne
Fjärranalys
Identifikatorer
URN: urn:nbn:se:smhi:diva-1508DOI: 10.1029/1999JD900255ISI: 000085512800051OAI: oai:DiVA.org:smhi-1508DiVA, id: diva2:847067
Tillgänglig från: 2015-08-19 Skapad: 2015-08-17 Senast uppdaterad: 2017-05-12Bibliografiskt granskad

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Josefsson, WeineLandelius, Tomas

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