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Mireille Lefèvre - One of the best experts on this subject based on the ideXlab platform.
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Improving the McClear model estimating the downwelling solar radiation at ground level in cloud-free conditions – McClear‑v3
Meteorologische Zeitschrift, 2019Co-Authors: Benoît Gschwind, Philippe Blanc, Lucien Wald, Mireille Lefèvre, Marion Schroedter-homscheidt, Antti ArolaAbstract:The fast McClear clear-sky model estimates the downwelling shortwave direct and diffuse Irradiances received at ground level under cloud-free conditions. Several improvements are presented. They focus on the modeling of changes in Irradiances with the solar zenithal angle and on a better exploitation of the aerosol properties offered by the Copernicus Atmosphere Monitoring Service (CAMS). Irradiances from this new version McClear-v3 were compared to 1 min measurements made in cloud-free conditions at 11 stations belonging to the Baseline Surface Radiation Network and being located in various climates. The correlation coefficient ranges between 0.982 and 0.999 for the global Irradiance. The bias is positive (overestimation) and ranges between 1 W m −2 (0.1 % of the mean observed Irradiance) and 20 W m −2 (3.2 %), with the exception of Barrow in Alaska (18 W m −2). The standard deviation ranges between 16 W m −2 (2.3 %) and 30 W m −2 (3.8 %). The correlation coefficient for the direct Irradiance ranges between 0.902 and 0.995. As expected, since the direct in McClear does not comprise any circumsolar contribution, the bias is negative (underestimation) and ranges between 49 W m −2 (7.7 %) and 5 W m −2 (0.7 %), with two exceptions: Sede Boqer (79 W m −2) and Brasilia (13 W m −2). The standard deviation is comprised between 34 W m −2 (5.3 %) and 69 W m −2 (10.7 %). These results are similar to those obtained with McClear version 2. Compared to the latter, McClear-v3 removes several artifacts and its estimates are continuous in space and time.
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mcclear a new model estimating downwelling solar radiation at ground level in clear sky conditions
Atmospheric Measurement Techniques, 2013Co-Authors: Mireille Lefèvre, Armel Oumbe, Philippe Blanc, Lucien Wald, Benoît Gschwind, Bella Espinar, Zhipeng Qu, Marion Schroedterhomscheidt, Carsten HoyerklickAbstract: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 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 comprises between −48 and +33 W m−2. The root mean square error (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 modelled by the MACC reanalysis.
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McClear: a new model estimating downwelling solar radiation at ground level in clear-sky conditions
Atmospheric Measurement Techniques, 2013Co-Authors: Mireille Lefèvre, Armel Oumbe, Philippe Blanc, Lucien Wald, Benoît Gschwind, Marion Schroedter-homscheidt, Antti Arola, Bella Espinar, Carsten Hoyer-klick, Angela BenedettiAbstract: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.
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using reduced data sets isccp b2 from the meteosat satellites to assess surface solar Irradiance
Solar Energy, 2007Co-Authors: Mireille Lefèvre, Lucien Wald, Lamissa DiabateAbstract:This paper explores the capabilities of a combination of the reduced data set ISCCP-B2 from the Meteosat satellites and the recently developed method Heliosat-2 to assess the daily mean of the surface solar Irradiance at any geographical site in Europe and Africa. Firstly, we discuss the implementation of the method Heliosat-2. Secondly, B2-derived Irradiances are compared to coincident measurements made in meteorological networks for 90 stations from 1994 to 1997. Bias is less than 1 W m-² for the whole set. Larger bias may be observed at individual sites, ranging from -15 to +32 W m-². For the whole set, the root mean square difference is 35 W m-² (17%) for daily mean Irradiance and 25 W m-² (12%) for monthly mean Irradiance. These accuracies are close to those of similar data sets of Irradiance, such as Medias and NASA Surface Radiation Budget. It is concluded that B2 data can be used in a reliable way to produce long-term time-series of Irradiance for Europe, Africa and the Atlantic Ocean.
Lucien Wald - One of the best experts on this subject based on the ideXlab platform.
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Improving the McClear model estimating the downwelling solar radiation at ground level in cloud-free conditions – McClear‑v3
Meteorologische Zeitschrift, 2019Co-Authors: Benoît Gschwind, Philippe Blanc, Lucien Wald, Mireille Lefèvre, Marion Schroedter-homscheidt, Antti ArolaAbstract:The fast McClear clear-sky model estimates the downwelling shortwave direct and diffuse Irradiances received at ground level under cloud-free conditions. Several improvements are presented. They focus on the modeling of changes in Irradiances with the solar zenithal angle and on a better exploitation of the aerosol properties offered by the Copernicus Atmosphere Monitoring Service (CAMS). Irradiances from this new version McClear-v3 were compared to 1 min measurements made in cloud-free conditions at 11 stations belonging to the Baseline Surface Radiation Network and being located in various climates. The correlation coefficient ranges between 0.982 and 0.999 for the global Irradiance. The bias is positive (overestimation) and ranges between 1 W m −2 (0.1 % of the mean observed Irradiance) and 20 W m −2 (3.2 %), with the exception of Barrow in Alaska (18 W m −2). The standard deviation ranges between 16 W m −2 (2.3 %) and 30 W m −2 (3.8 %). The correlation coefficient for the direct Irradiance ranges between 0.902 and 0.995. As expected, since the direct in McClear does not comprise any circumsolar contribution, the bias is negative (underestimation) and ranges between 49 W m −2 (7.7 %) and 5 W m −2 (0.7 %), with two exceptions: Sede Boqer (79 W m −2) and Brasilia (13 W m −2). The standard deviation is comprised between 34 W m −2 (5.3 %) and 69 W m −2 (10.7 %). These results are similar to those obtained with McClear version 2. Compared to the latter, McClear-v3 removes several artifacts and its estimates are continuous in space and time.
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mcclear a new model estimating downwelling solar radiation at ground level in clear sky conditions
Atmospheric Measurement Techniques, 2013Co-Authors: Mireille Lefèvre, Armel Oumbe, Philippe Blanc, Lucien Wald, Benoît Gschwind, Bella Espinar, Zhipeng Qu, Marion Schroedterhomscheidt, Carsten HoyerklickAbstract: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 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 comprises between −48 and +33 W m−2. The root mean square error (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 modelled by the MACC reanalysis.
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McClear: a new model estimating downwelling solar radiation at ground level in clear-sky conditions
Atmospheric Measurement Techniques, 2013Co-Authors: Mireille Lefèvre, Armel Oumbe, Philippe Blanc, Lucien Wald, Benoît Gschwind, Marion Schroedter-homscheidt, Antti Arola, Bella Espinar, Carsten Hoyer-klick, Angela BenedettiAbstract: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.
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selection and implementation of aerosol data for the prediction of solar resource in united arab emirates
SolarPACES 2012, 2012Co-Authors: Armel Oumbe, Zhor Hassar, Philippe Blanc, Lucien Wald, Antoine Fournier, Dominique Goffe, Matteo Chiesa, Hosni GhediraAbstract:In deserts, as the sky is often dusty and rarely cloudy, aerosols are the most critical atmospheric parameter for solar resource estimation. High differences between existing aerosol datasets, and low accuracies at solar Irradiance estimates in Arabian Peninsula have been reported. This work is a part of a process of developing a tool for Irradiance estimation accounting correctly for aerosols. As hourly Irradiances are the focus, only intra-day resolved aerosol data are of interest. The paper validates the MACC (re-analysis model) derived aerosol optical depth in United Arab Emirates, discusses its accuracy compared with that of MATCH (chemical transport model), evaluates the potential error on global and direct normal Irradiances due to the observed error on aerosol optical depth, and then proposes an algorithm for implementation of MACC partial aerosol optical depths in the libRadTran radiative transfer model.
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using reduced data sets isccp b2 from the meteosat satellites to assess surface solar Irradiance
Solar Energy, 2007Co-Authors: Mireille Lefèvre, Lucien Wald, Lamissa DiabateAbstract:This paper explores the capabilities of a combination of the reduced data set ISCCP-B2 from the Meteosat satellites and the recently developed method Heliosat-2 to assess the daily mean of the surface solar Irradiance at any geographical site in Europe and Africa. Firstly, we discuss the implementation of the method Heliosat-2. Secondly, B2-derived Irradiances are compared to coincident measurements made in meteorological networks for 90 stations from 1994 to 1997. Bias is less than 1 W m-² for the whole set. Larger bias may be observed at individual sites, ranging from -15 to +32 W m-². For the whole set, the root mean square difference is 35 W m-² (17%) for daily mean Irradiance and 25 W m-² (12%) for monthly mean Irradiance. These accuracies are close to those of similar data sets of Irradiance, such as Medias and NASA Surface Radiation Budget. It is concluded that B2 data can be used in a reliable way to produce long-term time-series of Irradiance for Europe, Africa and the Atlantic Ocean.
Kory J Priestley - One of the best experts on this subject based on the ideXlab platform.
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on orbit calibrations of the erbe active cavity radiometers on the earth radiation budget satellite erbs 1984 2002
Remote Sensing, 2004Co-Authors: Robert Benjamin Lee, G L Smith, Kathryn A Bush, Jack Paden, Dhirendra K Pandey, Robert S Wilson, Kory J PriestleyAbstract:From October 1984 until September 30, 1999, on-orbit, the Earth Radiation Budget Satellite (ERBS)/Earth Radiation Budget Experiment (ERBE) nonscanning, active cavity radiometers (ACR) were calibrated using observations of the incoming total solar Irradiance, and of reference Irradiances from an on-board tungsten lamp and blackbodies in order to determine drifts and shifts in the ACR responses. On October 7, 1999, the ERBE elevation drive system failed near the earth nadir viewing configuration. Thereafter, the elevation failure prevented observations of the on-board, built-in calibration systems. On July 23, August 8, and December 10, 2002, the ERBS was pitched 180 degrees to observe cold space, representative of a 3 Kelvin blackbody, in order to determine the ACR's zero-Irradiance offsets. On December 4, 2002, the ERBS was pitched 180 degrees away from the earth in order to observe the sun, and to determine the ACR's gains. In this paper, the 2002, 180-degree pitch calibrations are compared with the earlier 1984-1999, calibrations which were obtained using the on-orbit, built-in calibration systems. In addition, the 2002 calibrations are compared with earlier scheduled November 21, 1984, and October 20, 1985, 180-degree pitch calibrations, as well as with deep space calibrations from unscheduled July 2, 1987, January 16, 1999, and November 16, 2000, ERBS spacecraft tumbles. The 2002 ACR offsets were found to be consistent with 1984-2000 offsets at the 1.0 Wm -2 . 1984-1999, ERBE top-of-the-atmosphere (TOA), and satellite altitude (SA) earth Irradiances are presented. Analyses of the TOA ERBE earth Irradiances indicate that the TOA Irradiance time series exhibited a 1.7 Wm -2 increase as a result of 1988-1992, and 1998-2002 satellite altitudinal decreases during periods of maximum solar magnetic activity.
Robert Benjamin Lee - One of the best experts on this subject based on the ideXlab platform.
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on orbit calibrations of the erbe active cavity radiometers on the earth radiation budget satellite erbs 1984 2002
Remote Sensing, 2004Co-Authors: Robert Benjamin Lee, G L Smith, Kathryn A Bush, Jack Paden, Dhirendra K Pandey, Robert S Wilson, Kory J PriestleyAbstract:From October 1984 until September 30, 1999, on-orbit, the Earth Radiation Budget Satellite (ERBS)/Earth Radiation Budget Experiment (ERBE) nonscanning, active cavity radiometers (ACR) were calibrated using observations of the incoming total solar Irradiance, and of reference Irradiances from an on-board tungsten lamp and blackbodies in order to determine drifts and shifts in the ACR responses. On October 7, 1999, the ERBE elevation drive system failed near the earth nadir viewing configuration. Thereafter, the elevation failure prevented observations of the on-board, built-in calibration systems. On July 23, August 8, and December 10, 2002, the ERBS was pitched 180 degrees to observe cold space, representative of a 3 Kelvin blackbody, in order to determine the ACR's zero-Irradiance offsets. On December 4, 2002, the ERBS was pitched 180 degrees away from the earth in order to observe the sun, and to determine the ACR's gains. In this paper, the 2002, 180-degree pitch calibrations are compared with the earlier 1984-1999, calibrations which were obtained using the on-orbit, built-in calibration systems. In addition, the 2002 calibrations are compared with earlier scheduled November 21, 1984, and October 20, 1985, 180-degree pitch calibrations, as well as with deep space calibrations from unscheduled July 2, 1987, January 16, 1999, and November 16, 2000, ERBS spacecraft tumbles. The 2002 ACR offsets were found to be consistent with 1984-2000 offsets at the 1.0 Wm -2 . 1984-1999, ERBE top-of-the-atmosphere (TOA), and satellite altitude (SA) earth Irradiances are presented. Analyses of the TOA ERBE earth Irradiances indicate that the TOA Irradiance time series exhibited a 1.7 Wm -2 increase as a result of 1988-1992, and 1998-2002 satellite altitudinal decreases during periods of maximum solar magnetic activity.
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on orbit radiometric calibrations of the earth radiation budget experiment erbe active cavity radiometers on the earth radiation budget satellite erbs
International Symposium on Optical Science and Technology, 2002Co-Authors: Robert Benjamin Lee, Jack Paden, Dhirendra K Pandey, Robert S Wilson, Kathryn A BushAbstract:Between November 1984 and July 2002, the Earth Radiation Budget Satellite (ERBS)/Earth Radiation Budget Experiment (ERBE) nonscanning, active cavity radiometers (ACR) were used to measure incoming total solar Irradiance, earth-reflected solar Irradiance, and earth-emitted outgoing longwave radiation (OLR) Irradiance. The ERBE shortwave wide field-of view (SWFOV) and toal wide field-of-view (TWFOV) ACR's measured Irradiances from the entire earth disc in the shortwave (0.2-5.0 μm) and total (0.2-100 μm) broadband spectral regions. On-orbit, the ACR's observations of the incoming total solar Irradiance, and of reference Irradiance from on-board tungsten lamp and blackbodies were used to determine drifts and shifts in the ACR responses/gains. In the cases of the SWFOV ACR, its response/gain changed as much as 8.8% while the TWFOV response was stable at levels better than 0.1%. The precise measurements of gain and offset variations have permitted the generations of ERBE level 1 data products [earth-reflected solar (≈240 Wm -2 )and earth-emitted (≈100 Wm -2 ) Irradiances] at the precision levels better than 0.3 Wm -2 . In this paper, the ACR radiometric on-orbit calibration approaches and systems are outlined.
Benoît Gschwind - One of the best experts on this subject based on the ideXlab platform.
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Improving the McClear model estimating the downwelling solar radiation at ground level in cloud-free conditions – McClear‑v3
Meteorologische Zeitschrift, 2019Co-Authors: Benoît Gschwind, Philippe Blanc, Lucien Wald, Mireille Lefèvre, Marion Schroedter-homscheidt, Antti ArolaAbstract:The fast McClear clear-sky model estimates the downwelling shortwave direct and diffuse Irradiances received at ground level under cloud-free conditions. Several improvements are presented. They focus on the modeling of changes in Irradiances with the solar zenithal angle and on a better exploitation of the aerosol properties offered by the Copernicus Atmosphere Monitoring Service (CAMS). Irradiances from this new version McClear-v3 were compared to 1 min measurements made in cloud-free conditions at 11 stations belonging to the Baseline Surface Radiation Network and being located in various climates. The correlation coefficient ranges between 0.982 and 0.999 for the global Irradiance. The bias is positive (overestimation) and ranges between 1 W m −2 (0.1 % of the mean observed Irradiance) and 20 W m −2 (3.2 %), with the exception of Barrow in Alaska (18 W m −2). The standard deviation ranges between 16 W m −2 (2.3 %) and 30 W m −2 (3.8 %). The correlation coefficient for the direct Irradiance ranges between 0.902 and 0.995. As expected, since the direct in McClear does not comprise any circumsolar contribution, the bias is negative (underestimation) and ranges between 49 W m −2 (7.7 %) and 5 W m −2 (0.7 %), with two exceptions: Sede Boqer (79 W m −2) and Brasilia (13 W m −2). The standard deviation is comprised between 34 W m −2 (5.3 %) and 69 W m −2 (10.7 %). These results are similar to those obtained with McClear version 2. Compared to the latter, McClear-v3 removes several artifacts and its estimates are continuous in space and time.
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mcclear a new model estimating downwelling solar radiation at ground level in clear sky conditions
Atmospheric Measurement Techniques, 2013Co-Authors: Mireille Lefèvre, Armel Oumbe, Philippe Blanc, Lucien Wald, Benoît Gschwind, Bella Espinar, Zhipeng Qu, Marion Schroedterhomscheidt, Carsten HoyerklickAbstract: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 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 comprises between −48 and +33 W m−2. The root mean square error (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 modelled by the MACC reanalysis.
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McClear: a new model estimating downwelling solar radiation at ground level in clear-sky conditions
Atmospheric Measurement Techniques, 2013Co-Authors: Mireille Lefèvre, Armel Oumbe, Philippe Blanc, Lucien Wald, Benoît Gschwind, Marion Schroedter-homscheidt, Antti Arola, Bella Espinar, Carsten Hoyer-klick, Angela BenedettiAbstract: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.