INTERCOMPARISON OF SPECTRAL-UV-RADIATION MEASUREMENT SYSTEMS
1994
The results of what is to our knowledge the first intercomparison of seven
independent spectroradiometers measuring solar UV irradiances are presented. The
intercomparison was carried out in the GSF-Forschungszentrum fur Umwelt
und Gesundheit, Neuherberg (near Munich, Germany), on 13 July 1990. The
spectroradiometric measurements were supplemented by other meteorological,
optical, and chemical measurements at the same time. As this day was cloudless,
the data can be compared with the measurements taken by Bener in Switzerland in
the 1960’s and with the results of radiative transfer models. The
measured irradiances at noon differed by factors of up to 100. These large
differences demonstrate the great difficulties with this type of measurement.
Some instrument systems, however, ranged within tolerances of
±10%, thus allowing us to make recommendations for the
spectroradiometry of solar UV irradiances.
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