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Intercomparison of spectroradiometers and Sun photometers for the determination of the aerosol optical depth during the VELETA-2002 field campaign
Title: Intercomparison of spectroradiometers and Sun photometers for the determination of the aerosol optical depth during the VELETA-2002 field campaign
Authors: Estellés Leal, VíctorUtrillas, María PilarMartínez Lozano, José AntonioAlcántara, AntonioAlados Arboledas, LucasOlmo Reyes, Francisco JoséLorente, JerónimoCabo, Xavier deCachorro, Victoria E.Horvath, HelmuthLabajo Salazar, AntonioSorribas, MarDíaz González, Juan PedroDíaz Rodríguez, Ana MaríaAutor AEMETSilva, Ana MariaElias, ThierryPujadas, ManuelRodrigues, José-AntónioCañada, JavierGarcía, Yocelin
Keywords: UV radiation; Spectroradiometers; Sun photometers; AOD
Issue Date: 2006
Publisher: American Geophysical Union
Citation: Journal of Geophysical Research: Atmospheres. 2006, 111(D17), p. 1-15
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Abstract: In July 2002 the VELETA-2002 field campaign was held in Sierra Nevada (Granada) in the south of Spain. The main objectives of this field campaign were the study of the influence of elevation and atmospheric aerosols on measured UV radiation. In the first stage of the field campaign, a common calibration and intercomparison between Licor-1800 spectroradiometers and Cimel-318 Sun photometers was performed in order to assess the quality of the measurements from the whole campaign. The intercomparison of the Licor spectroradiometers showed, for both direct and global irradiances, that when the comparisons were restricted to the visible part of the spectrum the deviations were within the instruments’ nominal accuracies which allows us to rely on these instruments for measuring physical properties of aerosols at the different measurement stations. A simultaneous calibration on AOD data was performed for the Cimel-318 Sun photometers. When a common calibration and methodology was applied, the deviation was lowered to much less than 0.01 for AOD. At the same time an intercomparison has been made between the AOD values given by the spectroradiometers and the Sun photometers, with deviations obtained from 0.01 to 0.03 for the AOD in the visible range, depending on the channel. In the UVA range, the AOD uncertainty was estimated to be around 0.02 and 0.05 for Cimel and Licor respectively. In general the experimental differences were in agreement with this uncertainty estimation. In the UVB range the AOD measurements should not be used due to maximum instrumental uncertainties.
Sponsorship : This work was financed by CICYT-MCYT through the Coordinated Project CLI2000-0903.
ISSN: 2169-897X
Appears in Collections:Artículos científicos 2005-2009

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