Calibration improvement of the IAI Network for the measurement of UVR: multichannel instruments

Susana B. Diaz; Charles Rockwell Booth; Roy Armstrong; Sergio Cabrera; Claudio Cassiccia; Humberto Fuenzalida; Charlotte Lovengreen; Alejandro Paladini; Jorge Pedroni; A. Rosales; Horacio Zagarese; Claudio Brunat; Guillermo Deferrari; Carolina Camilion; Maria Vernet

doi:10.1117/12.466122

1 July 2003 Calibration improvement of the IAI Network for the measurement of UVR: multichannel instruments

Susana B. Diaz, Charles Rockwell Booth, Roy Armstrong, Sergio Cabrera, Claudio Cassiccia, Humberto Fuenzalida, Charlotte Lovengreen, Alejandro Paladini, Jorge Pedroni, A. Rosales, Horacio Zagarese, Claudio Brunat, Guillermo Deferrari, Carolina Camilion, Maria Vernet

Author Affiliations +

Proceedings Volume 4896, Ultraviolet Ground- and Space-based Measurements, Models, and Effects II; (2003) https://doi.org/10.1117/12.466122
Event: Third International Asia-Pacific Environmental Remote Sensing Remote Sensing of the Atmosphere, Ocean, Environment, and Space, 2002, Hangzhou, China

Abstract

The IAI Network for the measurement of ultraviolet radiation in Chile, Argentina and Puerto Rico is composed of ten multi-channel radiometers (GUV 511, Bisopherical Instruments Inc.), which are periodically sun calibrated with a traveling reference GUV (RGUV). The RGUV is calibrated under solar light against a SUV100 spectroradiometer. This calibration is then transferred to each instrument in the network through the RGUV. A previous multi-regression model proved to be suitable to derive narrowband irradiance from broadband irradiance, ozone column and solar zenith angles (SZA). A recent modification of the existing multi-regression model improved the multi-channel instrument sun calibration against spectroradiometers. In this approach, the narrowband irradiance is the SUV spectral irradiance and the broadband is the multi-channel GUV irradiance. We included the azimuth angle as a parameter into the multi-regression equation and we applied a non-linear function, instead of a single coefficient, to correct for SZA. In this paper, the new multi-regression approach is applied to both steps of a GUV calibration: SUV - RGUV and RGUV - GUV and the results are compared with traditional calibration methods. Important improvements are observed in the calibration, in particular for SZA larger than 50°.

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Susana B. Diaz, Charles Rockwell Booth, Roy Armstrong, Sergio Cabrera, Claudio Cassiccia, Humberto Fuenzalida, Charlotte Lovengreen, Alejandro Paladini, Jorge Pedroni, A. Rosales, Horacio Zagarese, Claudio Brunat, Guillermo Deferrari, Carolina Camilion, and Maria Vernet "Calibration improvement of the IAI Network for the measurement of UVR: multichannel instruments", Proc. SPIE 4896, Ultraviolet Ground- and Space-based Measurements, Models, and Effects II, (1 July 2003); https://doi.org/10.1117/12.466122

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