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

Lefèvre, Mireille and Oumbe, Armel and Blanc, Philippe and Espinar, Bella and Gschwind, Benoit and Qu, Zhipeng and Wald, Lucien and Schroedter-Homscheidt, Marion and Hoyer-Klick, Carsten and Arola, Antti and Benedetti, Angela and Kaiser, Johannes and Morcrette, Jean-Jacques (2013) McClear: a new model estimating downwelling solar radiation at ground level in clear-sky conditions. Atmospheric Measurement Techniques, 6, pp. 3367-3405. Copernicus Publications. doi: 10.5194/amtd-6-3367-2013. ISSN 1867-1381.

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Official URL: http://www.atmos-meas-tech-discuss.net/6/3367/2013/amtd-6-3367-2013.pdf


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 modelling replacing empirical relations or simpler models used before. It exploits the recent results on aerosol properties, and total column content in water vapor 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 10^5 times greater by adopting the abaci, or look-up tables, 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 is comprised between -6 and 25 W m-2. The RMSE ranges from 20 W m-2 (3% of the mean observed irradiance) to 36 W m-2 (5%) and the correlation coefficient ranges between 0.95 and 0.99. The bias for the direct irradiance is comprised between -48 and +33 W m-2. The RMSE ranges from 33 W m-2 (5%) to 64 W m-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 modeled by the MACC reanalysis.

Item URL in elib:https://elib.dlr.de/84165/
Document Type:Article
Title:McClear: a new model estimating downwelling solar radiation at ground level in clear-sky conditions
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lefèvre, MireilleMines ParisTechUNSPECIFIED
Oumbe, ArmelMines ParisTechUNSPECIFIED
Blanc, PhilippeMines ParisTechUNSPECIFIED
Espinar, BellaMines ParisTechUNSPECIFIED
Gschwind, BenoitMines ParisTechUNSPECIFIED
Qu, ZhipengMines ParisTechUNSPECIFIED
Wald, LucienMines ParisTechUNSPECIFIED
Schroedter-Homscheidt, MarionUNSPECIFIEDhttps://orcid.org/0000-0002-1854-903X
Hoyer-Klick, CarstenUNSPECIFIEDhttps://orcid.org/0000-0002-7273-9176
Morcrette, Jean-JacquesECMWFUNSPECIFIED
Journal or Publication Title:Atmospheric Measurement Techniques
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 3367-3405
Publisher:Copernicus Publications
Keywords:downwelling shortwave irradiance, retrieval, clear sky model, McClear, MACC, GMES
HGF - Research field:Energy, Aeronautics, Space and Transport
HGF - Program:Technology, Innovation and Society, Space
HGF - Program Themes:Renewable Energy (old), Earth Observation
DLR - Research area:Energy, Raumfahrt
DLR - Program:E MS - Systems analysis, R EO - Earth Observation
DLR - Research theme (Project):E - Systems Analysis and Technology Assessment (old), R - Atmospheric and climate research
Location: Oberpfaffenhofen , Stuttgart
Institutes and Institutions:German Remote Sensing Data Center
German Remote Sensing Data Center > Atmosphere
Institute of Engineering Thermodynamics > Systems Analysis and Technology Assessment
Deposited By: Schroedter-Homscheidt, Marion
Deposited On:17 Sep 2013 15:45
Last Modified:28 Mar 2023 23:41

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