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  • 1. Grobner, J
    et al.
    Rembges, D
    Bais, A F
    Blumthaler, M
    Cabot, T
    Josefsson, Weine
    SMHI, Research Department, Atmospheric remote sensing.
    Koskela, T
    Thorseth, T M
    Webb, A R
    Wester, U
    Quality assurance of reference standards from nine European solar-ultraviolet monitoring laboratories2002In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 41, no 21, p. 4278-4282Article in journal (Refereed)
    Abstract [en]

    A program for quality assurance of reference standards has been initiated among nine solar-UV monitoring laboratories. By means of a traveling lamp package that comprises several 1000-W ANSI code DXW-type quartz-halogen lamps, a 0.1-Omega shunt, and a 6-1/2 digit voltmeter, the irradiance scales used by the nine laboratories were compared with one another; a relative uncertainty of 1.2% was found. The comparison of 15 reference standards yielded differences of as much as 9%; the average difference was less than 3%. (C) 2002 Optical Society of America.

  • 2. Meinander, O.
    et al.
    Kazadzis, S.
    Blumthaler, M.
    Ylianttila, L.
    Johnsen, B.
    Lakkala, K.
    Koskela, T.
    Josefsson, Weine
    SMHI, Research Department, Atmospheric remote sensing.
    Diurnal discrepancies in spectral solar UV radiation measurements2006In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 45, no 21, p. 5346-5357Article in journal (Refereed)
    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.

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