Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

McClear: a new model estimating downwelling solar radiation at ground level in clear-sky conditions

Abstract : A new fast clear-sky model called McClear was developed to estimate the downwelling shortwave direct and global irradiances received at ground level under clear skies. It is a fully physical model replacing empirical relations or simpler models used before. It exploits the recent results on aerosol properties, and total column content in water vapour and ozone produced by the MACC project (Monitoring Atmosphere Composition and Climate). It accurately reproduces the irradiance computed by the libRadtran reference radiative transfer model with a computational speed approximately 105 times greater by adopting the abaci, or look-up table, approach combined with interpolation functions. It is therefore suited for geostationary satellite retrievals or numerical weather prediction schemes with many pixels or grid points, respectively. McClear irradiances were compared to 1 min measurements made in clear-sky conditions at several stations within the Baseline Surface Radiation Network in various climates. The bias for global irradiance comprises between −6 and 25Wm−2. The RMSE ranges from 20Wm−2 (3% of the mean observed irradiance) to 36Wm−2 (5 %) and the correlation coefficient ranges between 0.95 and 0.99. The bias for the direct irradiance comprises between −48 and +33Wm−2. The root mean square error (RMSE) ranges from 33Wm−2 (5 %) to 64Wm−2 (10 %). The correlation coefficient ranges between 0.84 and 0.98. This work demonstrates the quality of the McClear model combined with MACC products, and indirectly the quality of the aerosol properties modelled by the MACC reanalysis.
Type de document :
Article dans une revue
Liste complète des métadonnées

Littérature citée [57 références]  Voir  Masquer  Télécharger
Contributeur : Lucien Wald <>
Soumis le : mardi 17 septembre 2013 - 17:35:26
Dernière modification le : mercredi 14 octobre 2020 - 04:13:41
Archivage à long terme le : : vendredi 20 décembre 2013 - 14:30:56


Fichiers éditeurs autorisés sur une archive ouverte




Mireille Lefèvre, Armel Oumbe, Philippe Blanc, Bella Espinar, Benoît Gschwind, et al.. McClear: a new model estimating downwelling solar radiation at ground level in clear-sky conditions. Atmospheric Measurement Techniques, European Geosciences Union, 2013, 6, pp.2403-2418. ⟨10.5194/amt-6-2403-2013⟩. ⟨hal-00862906⟩



Consultations de la notice


Téléchargements de fichiers