Validation of the Surface Downwelling Solar Irradiance Estimates of the HelioClim-3 Database in Egypt
HelioClim-3 (HC3) is a database providing time series of the surface downwelling solar irradiance that are computed from images of the Meteosat satellites. This paper presents the validation results of the hourly global horizontal irradiance (GHI) and direct normal irradiance (DNI), i.e., beam irrad...
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| Format: | Article |
| Language: | English |
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MDPI AG
2015-07-01
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| Series: | Remote Sensing |
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| Online Access: | http://www.mdpi.com/2072-4292/7/7/9269 |
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| author | Yehia Eissa Mohamed Korany Youva Aoun Mohamed Boraiy Magdy M. Abdel Wahab Stephane C. Alfaro Philippe Blanc Mossad El-Metwally Hosni Ghedira Katja Hungershoefer Lucien Wald |
| author_facet | Yehia Eissa Mohamed Korany Youva Aoun Mohamed Boraiy Magdy M. Abdel Wahab Stephane C. Alfaro Philippe Blanc Mossad El-Metwally Hosni Ghedira Katja Hungershoefer Lucien Wald |
| author_sort | Yehia Eissa |
| collection | DOAJ |
| description | HelioClim-3 (HC3) is a database providing time series of the surface downwelling solar irradiance that are computed from images of the Meteosat satellites. This paper presents the validation results of the hourly global horizontal irradiance (GHI) and direct normal irradiance (DNI), i.e., beam irradiance at normal incidence, of versions four and five of HC3 at seven Egyptian sites. The validation is performed for all-sky conditions, as well as cloud-free conditions. Both versions of HC3 provide similar performances whatever the conditions. Another comparison is made with the estimates provided by the McClear database that is restricted to cloud-free conditions. All databases capture well the temporal variability of the GHI in all conditions, McClear being superior for cloud-free cases. In cloud-free conditions for the GHI, the relative root mean square error (RMSE) are fairly similar, ranging from 6% to 15%; both HC3 databases exhibit a smaller bias than McClear. McClear offers an overall better performance for the cloud-free DNI estimates. For all-sky conditions, the relative RMSE for GHI ranges from 10% to 22%, except one station, while, for the DNI, the results are not so good for the two stations with DNI measurements. |
| first_indexed | 2024-12-13T10:49:07Z |
| format | Article |
| id | doaj.art-657f3156f0bf459d8dd6713c11f321f1 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-12-13T10:49:07Z |
| publishDate | 2015-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-657f3156f0bf459d8dd6713c11f321f12022-12-21T23:49:56ZengMDPI AGRemote Sensing2072-42922015-07-01779269929110.3390/rs70709269rs70709269Validation of the Surface Downwelling Solar Irradiance Estimates of the HelioClim-3 Database in EgyptYehia Eissa0Mohamed Korany1Youva Aoun2Mohamed Boraiy3Magdy M. Abdel Wahab4Stephane C. Alfaro5Philippe Blanc6Mossad El-Metwally7Hosni Ghedira8Katja Hungershoefer9Lucien Wald10Masdar Institute, Research Center for Renewable Energy Mapping and Assessment, P.O. Box 54224 Abu Dhabi, UAEEgyptian Meteorological Authority, Cairo 11599, EgyptMINES ParisTech, PSL Research University, O.I.E. – Centre Observation, Impacts, Energy, CS 10207 – 06904 Sophia Antipolis cedex, FrancePhysics and Mathematical Engineering Department, Faculty of Engineering, Port Said University, Port Said 42526, EgyptAstronomy and Meteorology Department, Faculty of Science, Cairo University, Giza 12613, EgyptLaboratoire Inter-universitaire des Systèmes Atmosphériques, Universités de Paris-Est Créteil et Paris-Diderot, Paris 94010, FranceMINES ParisTech, PSL Research University, O.I.E. – Centre Observation, Impacts, Energy, CS 10207 – 06904 Sophia Antipolis cedex, FrancePhysics Department, Faculty of Science, Port Said University, Port Said 42526, EgyptMasdar Institute, Research Center for Renewable Energy Mapping and Assessment, P.O. Box 54224 Abu Dhabi, UAEDeutscher Wetterdienst, Offenbach 63067, GermanyMINES ParisTech, PSL Research University, O.I.E. – Centre Observation, Impacts, Energy, CS 10207 – 06904 Sophia Antipolis cedex, FranceHelioClim-3 (HC3) is a database providing time series of the surface downwelling solar irradiance that are computed from images of the Meteosat satellites. This paper presents the validation results of the hourly global horizontal irradiance (GHI) and direct normal irradiance (DNI), i.e., beam irradiance at normal incidence, of versions four and five of HC3 at seven Egyptian sites. The validation is performed for all-sky conditions, as well as cloud-free conditions. Both versions of HC3 provide similar performances whatever the conditions. Another comparison is made with the estimates provided by the McClear database that is restricted to cloud-free conditions. All databases capture well the temporal variability of the GHI in all conditions, McClear being superior for cloud-free cases. In cloud-free conditions for the GHI, the relative root mean square error (RMSE) are fairly similar, ranging from 6% to 15%; both HC3 databases exhibit a smaller bias than McClear. McClear offers an overall better performance for the cloud-free DNI estimates. For all-sky conditions, the relative RMSE for GHI ranges from 10% to 22%, except one station, while, for the DNI, the results are not so good for the two stations with DNI measurements.http://www.mdpi.com/2072-4292/7/7/9269atmospheremodelsolar radiationsurface solar irradiance |
| spellingShingle | Yehia Eissa Mohamed Korany Youva Aoun Mohamed Boraiy Magdy M. Abdel Wahab Stephane C. Alfaro Philippe Blanc Mossad El-Metwally Hosni Ghedira Katja Hungershoefer Lucien Wald Validation of the Surface Downwelling Solar Irradiance Estimates of the HelioClim-3 Database in Egypt Remote Sensing atmosphere model solar radiation surface solar irradiance |
| title | Validation of the Surface Downwelling Solar Irradiance Estimates of the HelioClim-3 Database in Egypt |
| title_full | Validation of the Surface Downwelling Solar Irradiance Estimates of the HelioClim-3 Database in Egypt |
| title_fullStr | Validation of the Surface Downwelling Solar Irradiance Estimates of the HelioClim-3 Database in Egypt |
| title_full_unstemmed | Validation of the Surface Downwelling Solar Irradiance Estimates of the HelioClim-3 Database in Egypt |
| title_short | Validation of the Surface Downwelling Solar Irradiance Estimates of the HelioClim-3 Database in Egypt |
| title_sort | validation of the surface downwelling solar irradiance estimates of the helioclim 3 database in egypt |
| topic | atmosphere model solar radiation surface solar irradiance |
| url | http://www.mdpi.com/2072-4292/7/7/9269 |
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