Improving the McClear model estimating the downwelling solar radiation at ground level in cloud-free conditions – McClear-v3
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 exploitatio...
Published in: | Meteorologische Zeitschrift |
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Borntraeger Science Publishers
2019
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Online Access: | https://elib.dlr.de/127883/ https://elib.dlr.de/127883/1/gschwind_mcclear-v3_2019_metzet.pdf https://www.schweizerbart.de/papers/metz/detail/28/90593/Improving_the_McClear_model_estimating_the_downwelling_solar_radiation_at_ground_level_in_cloud_free_conditions_McClear_v3 |
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ftdlr:oai:elib.dlr.de:127883 2023-05-15T15:39:44+02:00 Improving the McClear model estimating the downwelling solar radiation at ground level in cloud-free conditions – McClear-v3 Gschwind, Benoit Wald, Lucien Blanc, Philippe Lefevre, M Schroedter-Homscheidt, Marion Arola, Antti 2019-03-25 application/pdf https://elib.dlr.de/127883/ https://elib.dlr.de/127883/1/gschwind_mcclear-v3_2019_metzet.pdf https://www.schweizerbart.de/papers/metz/detail/28/90593/Improving_the_McClear_model_estimating_the_downwelling_solar_radiation_at_ground_level_in_cloud_free_conditions_McClear_v3 en eng Borntraeger Science Publishers https://elib.dlr.de/127883/1/gschwind_mcclear-v3_2019_metzet.pdf Gschwind, Benoit und Wald, Lucien und Blanc, Philippe und Lefevre, M und Schroedter-Homscheidt, Marion und Arola, Antti (2019) Improving the McClear model estimating the downwelling solar radiation at ground level in cloud-free conditions – McClear-v3. Meteorologische Zeitschrift, 28 (2). Borntraeger Science Publishers. DOI:10.1127/metz/2019/0946 <https://doi.org/10.1127/metz/2019/0946> ISSN 0941-2948 cc_by_nc CC-BY-NC Institut für Vernetzte Energiesysteme Zeitschriftenbeitrag PeerReviewed 2019 ftdlr https://doi.org/10.1127/metz/2019/0946 2019-12-22T23:56:29Z 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. Other Non-Article Part of Journal/Newspaper Barrow Alaska German Aerospace Center: elib - DLR electronic library Meteorologische Zeitschrift 28 2 147 163 |
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German Aerospace Center: elib - DLR electronic library |
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English |
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Institut für Vernetzte Energiesysteme |
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Institut für Vernetzte Energiesysteme Gschwind, Benoit Wald, Lucien Blanc, Philippe Lefevre, M Schroedter-Homscheidt, Marion Arola, Antti Improving the McClear model estimating the downwelling solar radiation at ground level in cloud-free conditions – McClear-v3 |
topic_facet |
Institut für Vernetzte Energiesysteme |
description |
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. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
Gschwind, Benoit Wald, Lucien Blanc, Philippe Lefevre, M Schroedter-Homscheidt, Marion Arola, Antti |
author_facet |
Gschwind, Benoit Wald, Lucien Blanc, Philippe Lefevre, M Schroedter-Homscheidt, Marion Arola, Antti |
author_sort |
Gschwind, Benoit |
title |
Improving the McClear model estimating the downwelling solar radiation at ground level in cloud-free conditions – McClear-v3 |
title_short |
Improving the McClear model estimating the downwelling solar radiation at ground level in cloud-free conditions – McClear-v3 |
title_full |
Improving the McClear model estimating the downwelling solar radiation at ground level in cloud-free conditions – McClear-v3 |
title_fullStr |
Improving the McClear model estimating the downwelling solar radiation at ground level in cloud-free conditions – McClear-v3 |
title_full_unstemmed |
Improving the McClear model estimating the downwelling solar radiation at ground level in cloud-free conditions – McClear-v3 |
title_sort |
improving the mcclear model estimating the downwelling solar radiation at ground level in cloud-free conditions – mcclear-v3 |
publisher |
Borntraeger Science Publishers |
publishDate |
2019 |
url |
https://elib.dlr.de/127883/ https://elib.dlr.de/127883/1/gschwind_mcclear-v3_2019_metzet.pdf https://www.schweizerbart.de/papers/metz/detail/28/90593/Improving_the_McClear_model_estimating_the_downwelling_solar_radiation_at_ground_level_in_cloud_free_conditions_McClear_v3 |
genre |
Barrow Alaska |
genre_facet |
Barrow Alaska |
op_relation |
https://elib.dlr.de/127883/1/gschwind_mcclear-v3_2019_metzet.pdf Gschwind, Benoit und Wald, Lucien und Blanc, Philippe und Lefevre, M und Schroedter-Homscheidt, Marion und Arola, Antti (2019) Improving the McClear model estimating the downwelling solar radiation at ground level in cloud-free conditions – McClear-v3. Meteorologische Zeitschrift, 28 (2). Borntraeger Science Publishers. DOI:10.1127/metz/2019/0946 <https://doi.org/10.1127/metz/2019/0946> ISSN 0941-2948 |
op_rights |
cc_by_nc |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.1127/metz/2019/0946 |
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Meteorologische Zeitschrift |
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28 |
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2 |
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147 |
op_container_end_page |
163 |
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