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Diurnal discrepancies in spectral solar UV radiation measurements
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2006 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 45, no 21, 5346-5357 p.Article in journal (Refereed) Published
Abstract [en]

Unexpected diurnal discrepancies between high-quality spectroradiometers were observed during the 2000 Nordic Ozone Group Intercomparison campaign. The spectral ratios of the irradiances showed a diurnal variation of similar to 2-9%. This cannot be explained by the nonideal angular response of the instruments' input optics in one plane (cosine effect). Instead, by using a radiative transfer model, we show that differences in the angular response in four azimuth planes have the potential to bias the measured data by up to 4.4% (azimuth effect). Other relevant factors are also discussed and quantified and are shown to be significant when diurnal changes in radiation are explained by environmental factors, or when measured data are compared with model or satellite data. Again, intercomparison campaigns have the potential to reveal errors that would otherwise remain undetected. (c) 2006 Optical Society of America.

Place, publisher, year, edition, pages
2006. Vol. 45, no 21, 5346-5357 p.
National Category
Meteorology and Atmospheric Sciences
Research subject
Remote sensing
Identifiers
URN: urn:nbn:se:smhi:diva-792DOI: 10.1364/AO.45.005346ISI: 000239181600028PubMedID: 16826271OAI: oai:DiVA.org:smhi-792DiVA: diva2:807051
Available from: 2015-04-22 Created: 2015-04-22 Last updated: 2016-01-25Bibliographically approved

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