Intercomparison of erythemal broadband radiometers calibrated by seven UV calibration facilities in Europe and the USA

A bi-lateral intercomparison of erythemal broadband radiometers was performed between seven UV calibration facilities. The owners calibrations were compared relative to the characterisation and calibration performed at PMOD/WRC in Davos, Switzerland. The calibration consisted in the determination of...

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Bibliographic Details
Published in:Atmospheric chemistry and physics discussions 2008-02, Vol.8 (1), p.2249-2273
Main Authors: Huelsen, G, Groebner, J, Bais, A, Blumthaler, M, Disterhoft, P, Johnsen, B, Lantz, KO, Meleti, C, Schreder, J, Vilaplana Guerrero, JM, Ylianttila, L
Format: Article
Language:English
Subjects:
Ocean, Atmosphere
Sciences of the Universe
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Summary:A bi-lateral intercomparison of erythemal broadband radiometers was performed between seven UV calibration facilities. The owners calibrations were compared relative to the characterisation and calibration performed at PMOD/WRC in Davos, Switzerland. The calibration consisted in the determination of the spectral and angular response of the radiometer, followed by an absolute calibration performed outdoors relative to a spectroradiometer which provided the absolute reference. The characterization of the detectors in the respective laboratories are in good agreement: The determination of the angular responses have deviations below ±4% and the spectral responses agree within ±20%. A "blind" intercomparison of the erythemally weighted irradiances derived by the respective institutes and PMOD/WRC showed consistent measurements to within ±2% for the majority of institutes. One institute showed slightly larger deviation of 10%. The differences found between the different instrument calibrations are all within the combined uncertainty of the calibration.
ISSN:1680-7367
1680-7375