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Proceedings Paper

International intercomparison of multiband filter radiometers in Oslo 2005
Author(s): B. Johnsen; B. Kjeldstad; T. N. Aalerud; L. T. Nilsen; J. Schreder; M. Blumthaler; G. Bernhard; A. Bagheri; B. Bhattarai; C. Topaloglou; G. Zablocki; O. Meinander; B. A. Høiskar; R. Haugen; W. S. Durham; G. Janson; A. R. Marrero; A. Dahlback; D. Bolsée; J. R. Slusser; J. Stamnes; C. Torres; A. R. D. Smedley; L.-E. Paulsson; K. Lakkala; A. R. Webb; J. B. Ørbæk; A. A. Grimenes; T. Ringstad; T. Lange; W. Josefsson
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Paper Abstract

Multiband filter radiometers (MBFRs) are extensively used in national networks for UV climate monitoring and information to the public about the potential risk of solar UV exposure. In order to provide an international, uniform expression of the Global UV index measurements, a harmonized calibration scale is needed. In this paper we present the results of the first international intercomparison of MBFRs held in Oslo in 2005. The purposes are to evaluate the UV-index scale of different radiometers and to provide a harmonized UV-index scale based on the radiometers individual directional and absolute spectral response functions. In total 43 MBFR radiometers and 4 high resolution spectroradiometers were assembled, representing UV-monitoring networks operated by institutions in US, Spain, Greece, Poland, Belgium, UK, Austria, Norway, Sweden and Finland. The radiometers are operating worldwide, with stations in the Antarctica and Arctic, North- and South-America, Africa, Europe, Middle-East and Nepal. All sky conditions were realized during the campaign period. The agreement between the users' own processed UVI and the reference is generally very good; within ±5% for 22 out of 26 data sets (75%) and ±10% for 23 out of 26 (88%). Solar zenith dependent discrepancies and drift in the users' UVI scales is seen, but the performance of most radiometers is generally very good. All the objectives planned for the intercomparison were fulfilled and the campaign considered a success.

Paper Details

Date Published: 11 October 2006
PDF: 12 pages
Proc. SPIE 6362, Remote Sensing of Clouds and the Atmosphere XI, 63620W (11 October 2006); doi: 10.1117/12.688918
Show Author Affiliations
B. Johnsen, Norwegian Radiation Protection Authority (Norway)
B. Kjeldstad, Norwegian Univ. of Science and Technology (Norway)
T. N. Aalerud, Norwegian Radiation Protection Authority (Norway)
L. T. Nilsen, Norwegian Radiation Protection Authority (Norway)
J. Schreder, Calibration Measurement Software Solutions (Austria)
M. Blumthaler, Innsbruck Medical Univ. (Austria)
G. Bernhard, Biospherical Instruments Inc. (United States)
A. Bagheri, Norwegian Univ. of Science and Technology (Norway)
B. Bhattarai, Norwegian Univ. of Science and Technology (Norway)
C. Topaloglou, Aristotle Univ. of Thessaloniki (Greece)
G. Zablocki, Institute of Meteorology and Water Management (Poland)
O. Meinander, Finnish Meteorological Institute (Finland)
B. A. Høiskar, Norwegian Institute for Air Research (Norway)
R. Haugen, Norwegian Institute for Air Research (Norway)
W. S. Durham, Colorado State Univ. (United States)
G. Janson, Colorado State Univ. (United States)
A. R. Marrero, Observatorio Atmoferico de Izaña, Instituto Nacional de Meteorologia (Spain)
A. Dahlback, Univ. of Oslo (Norway)
D. Bolsée, Belgian Institute for Space Aeronomy (Belgium)
J. R. Slusser, Colorado State Univ. (United States)
J. Stamnes, Univ. of Bergen (Norway)
C. Torres, Observatorio Atmoferico de Izaña, Instituto Nacional de Meteorologia (Spain)
A. R. D. Smedley, Univ. of Manchester (United Kingdom)
L.-E. Paulsson, Swedish Radiation Protection Authority (Sweden)
K. Lakkala, Finnish Meteorological Institute (Finland)
A. R. Webb, Univ. of Manchester (United Kingdom)
J. B. Ørbæk, Norwegian Polar Institute (Norway)
A. A. Grimenes, Norwegian Univ. of Life Sciences, Mathematics, and Technology (Norway)
T. Ringstad, Norwegian Univ. of Life Sciences, Mathematics, and Technology (Norway)
T. Lange, Univ. of Bergen (Norway)
W. Josefsson, Swedish Meteorological and Hydrological Institute (Sweden)

Published in SPIE Proceedings Vol. 6362:
Remote Sensing of Clouds and the Atmosphere XI
James R. Slusser; Klaus Schäfer; Adolfo Comerón, Editor(s)

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