McClear: a new model estimating downwelling solar radiation at ground level in clear-sky conditions - Mines Paris Accéder directement au contenu
Article Dans Une Revue Atmospheric Measurement Techniques Année : 2013

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

Résumé

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.
Fichier principal
Vignette du fichier
2013_amt_lefevre_mcclear.pdf (791.72 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-00862906 , version 1 (17-09-2013)

Identifiants

Citer

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, 2013, 6, pp.2403-2418. ⟨10.5194/amt-6-2403-2013⟩. ⟨hal-00862906⟩
978 Consultations
1081 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More