First validation of the surface solar irradiance data set produced by the MACC/MACC-II projects

摘要: The MACC / MACC-II projects (Monitoring Atmosphere Composition and Climate) have developed the new Heliosat-4 method to estimates downwelling shortwave direct global irradiances received at ground level under clear cloudy skies. It is a fully physical model using fast still accurate approximation of libRadtran radiative transfer serving as reference. composed two abaci-based, or look-up tables, models: already-published McClear calculating irradiance sky McCloud extinction due clouds. Inputs are aerosol properties, total column content in water vapour ozone produced by MACC/MACC-II cloud properties derived from images Meteosat satellites APOLLO (AVHRR Processing scheme Over cLouds, Land Ocean) scheme. 15 min means estimated were compared corresponding measurements made 14 stations located various climates within Baseline Surface Radiation Network. bias for comprised between 4 34 W m 2. RMSE around 90 2 most its relative value ranges 15% 20% mean observed desert Mediterranean climate, 26% 45% rainy climate with mild winters. correlation coefficient 0.88 0.97. 44 +46 81 (32% irradiance) 189 (64%). 0.81 0.95. Compared other methods, this first version reveals satisfactory results.