Assessing the surface solar irradiance under cloud-free skies in Israel with the McClear model
Résumé
A new fast clear-sky model called McClear was developed within the MACC project (Monitoring Atmosphere
Composition and Climate) to estimate the downwelling shortwave direct and global irradiances received at ground
level under clear skies and is now available as a Web service. It is a fully physical modelling that exploits the
recent results on aerosol properties, and total column content in water vapor and ozone produced by the MACC
project. It has been validated for several places in the world. The work presented here focus on Israel and aims at
checking the performances of McClear under this desert conditions. McClear irradiances are compared to 1 min
measurements made in clear-sky conditions at three stations which are distant from less than 100 km. The bias
for global irradiance is comprised between 2 and 32 W m-2, i.e. between 0% and 4% of of the mean observed
irradiance. The RMSE ranges from 30 W m-2 to 41 W m-2 (4%). The correlation coefficient is 0.99. The bias for
the direct irradiance at normal incidence (DNI) is comprised between -68 and +13 W m-2, i.e. between -8% and
2% of of the mean observed DNI. The RMSE ranges from 53 W m-2 (7%) to 83 W m-2 (10%). The correlation
coefficient ranges between 0.963 and 0.967. Overall, the errors are very small and it can be concluded that McClear
predicts accurately the solar radiation in clear-sky conditions. The performances are similar for the three sites for
the global irradiance and for the DNI to a lesser extent. This was expected and demonstrates the robustness of
the McClear model combined with MACC products. These results are discussed in the light of those obtained by
McClear for other desert areas : Egypt and United Arab Emirates.
Format : Poster
Origine : Fichiers produits par l'(les) auteur(s)
Origine : Fichiers produits par l'(les) auteur(s)