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Improving HelioClim-3 estimates of surface solar irradiance using the McClear clear-sky model and recent advances in atmosphere composition

Abstract : The HelioClim-3 database (HC3v3) provides records of surface solar irradiation every 15 min, estimated by processing images from the geostationary meteorologi-cal Meteosat satellites using climatological data sets of the atmospheric Linke turbidity factor. This technical note pro-poses a method to improve a posteriori HC3v3 by combining it with data records of the irradiation under clear skies from the new McClear clear-sky model, whose inputs are the ad-vanced global aerosol property forecasts and physically con-sistent total column content in water vapour and ozone pro-duced by the MACC (Monitoring Atmosphere Composition and Climate) projects. The method is validated by compar-ison with a series of ground measurements for 15 min and 1 h for 6 stations and for daily irradiation for 23 stations. The correlation coefficient is large, greater than respectively 0.92, 0.94, and 0.97, for 15 min, 1 h and daily irradiation. The bias ranges from −4 to 4 % of the mean observed irradiation for most sites. The relative root mean square difference (RMSD) varies between 14 and 38 % for 15 min, 12 and 33 % for 1 h irradiation, and 6 and 20 % for daily irradiation. As a rule of thumb, the farther from the nadir of the Meteosat satellite located at latitude 0 • and longitude 0 • , and the greater the occurrence of fragmented cloud cover, the greater the rela-tive RMSD. The method improves HC3v3 in most cases, and with no degradation in the others. A systematic correction of HC3v3 with McClear is recommended.
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Submitted on : Tuesday, November 25, 2014 - 4:46:09 PM
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Zhipeng Qu, Benoît Gschwind, Mireille Lefèvre, Lucien Wald. Improving HelioClim-3 estimates of surface solar irradiance using the McClear clear-sky model and recent advances in atmosphere composition. Atmospheric Measurement Techniques, European Geosciences Union, 2014, 7, pp.3927 - 3933. ⟨10.5194/amt-7-3927-2014⟩. ⟨hal-01087291⟩

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