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| Titel |
First national intercomparison of solar ultraviolet radiometers in Italy |
| VerfasserIn |
H. Diémoz, A. M. Siani, G. R. Casale, A. Sarra, B. Serpillo, B. Petkov, S. Scaglione, A. Bonino, S. Facta, F. Fedele, D. Grifoni, L. Verdi, G. Zipoli |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 4, no. 8 ; Nr. 4, no. 8 (2011-08-31), S.1689-1703 |
| Datensatznummer |
250002084
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| Publikation (Nr.) |
 copernicus.org/amt-4-1689-2011.pdf |
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| Zusammenfassung |
| A blind intercomparison of ground-based ultraviolet (UV) instruments has been
organized for the first time in Italy. The campaign was coordinated by the
Environmental Protection Agency of Aosta Valley (ARPA Valle d'Aosta) and took
place in Saint-Christophe (45.8° N, 7.4° E, 570 m a.s.l.), in
the Alpine region, from 8 to 23 June 2010. It involved 8 institutions, 10
broadband radiometers, 2 filter radiometers and 2 spectroradiometers.
Synchronized measurements of downward global solar UV irradiance at the
ground were collected and the raw series were then individually processed by
the respective operators on the base of their own procedures and calibration
data.
A radiative transfer model was successfully applied as an interpretative tool.
The input parameters and output results are described in detail.
The comparison was performed in terms of global solar UV Index and
integrated UV-A irradiance against a well-calibrated double monochromator
spectroradiometer as reference. An improved algorithm for comparing broadband
data and spectra has been developed and is discussed in detail. For some instruments,
we found average
deviations ranging from −16 % up to 20 % relative to the reference and
diurnal variations as large as 15 % even in clear days. Remarkable deviations
were found for the instruments calibrated in the manufacturers' facilities
and never involved in field intercomparison.
Finally, some recommendations to the UV operators based on the campaign results
are proposed. |
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