Atmospheric Chemistry and Physics Discussions
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2008
10.5194/acpd-8-2249-2008
http://www.atmos-chem-phys-discuss.net/8/2249/2008/
http://www.atmos-chem-phys-discuss.net/8/2249/2008/acpd-8-2249-2008.html
http://www.atmos-chem-phys-discuss.net/8/2249/2008/acpd-8-2249-2008.pdf
2249
2273
2008-02-06
Intercomparison of erythemal broadband radiometers calibrated by seven UV calibration facilities in Europe and the USA
G. Hülsen
gregor.huelsen@pmodwrc.ch
J. Gröbner
A. Bais
M. Blumthaler
P. Disterhoft
B. Johnsen
K. O. Lantz
C. Meleti
J. Schreder
J. M. Vilaplana Guerrero
L. Ylianttila
Physikalisch-Meteorologisches Observatorium Davos / World Radiation Center, Dorfstrasse 30, 7278 Davos Dorf, Switzerland
Aristotle University of Thessaloniki, Laboratory of Atmospheric Physics, Campus Box 149, 541 24 Thessaloniki, Greece
Innsbruck Medical University, Division for Biomedical Physics, Müllerstr. 44, 6020 Innsbruck, Austria
National Oceanic and Atmospheric Administration, Central UV Calibration Facility, 325 Broadway, 80305 Boulder, CO, USA
Norwegian Radiation Protection Authority, Grini Naeringspark 13, 1361 Osteras, Norway
CMS Ing. Dr. Schreder GmbH, Eggerstrasse 8, 6322 Kirchbichl, Austria
Instituto Nacional de Técnica Aerospacial, Estación de Sondeos Atmosféricos El Arenosillo, 21130 Mazagon, Spain
STUK, Radiation and Nuclear Safety Authority, Non-Ionizing Radiation Laboratory, P.O. Box 14, 00881 Helsinki, Finland
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.
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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.
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