Evaluation of gridded precipitation datasets over Iran
Study region: Six climate zones in Iran: Zone 1 (humid Caspian region), Zone 2 (cold and semi-arid northwestern Iran), Zone 3 (mild and semi-humid western Iran), Zone 4 (mild and semi-arid northeastern Iran), Zone 5 (warm and semi-arid southwestern Iran), and Zone 6 (warm and arid eastern, southern,...
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Elsevier
2025-04-01
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| Series: | Journal of Hydrology: Regional Studies |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214581825000588 |
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| author | Mohammad Saeed Najafi Omid Alizadeh Tobias Sauter |
| author_facet | Mohammad Saeed Najafi Omid Alizadeh Tobias Sauter |
| author_sort | Mohammad Saeed Najafi |
| collection | DOAJ |
| description | Study region: Six climate zones in Iran: Zone 1 (humid Caspian region), Zone 2 (cold and semi-arid northwestern Iran), Zone 3 (mild and semi-humid western Iran), Zone 4 (mild and semi-arid northeastern Iran), Zone 5 (warm and semi-arid southwestern Iran), and Zone 6 (warm and arid eastern, southern, and southeastern Iran). Study focus: This study evaluates the performance of seven gridded precipitation datasets (CRU TS, TMPA 3B43, GPCC, IMERG, MERRA-2, ERA5, and PDIR) against rain gauge data. The accuracy of these datasets in representing precipitation patterns is assessed from 2000 to 2017, with a focus on their performance across diverse climate zones in Iran. New insights for the region: In Zone 1, ERA5 performs best in winter and autumn, while GPCC excels in spring and summer. In Zones 2 and 3, GPCC is the top performer in most seasons, while CRU TS performs best in autumn and winter for Zone 2. In Zone 4, GPCC outperforms all datasets year-round. In Zone 5, TMPA 3B43 performs best in winter, with GPCC slightly outperforming others in other seasons. Overall, ERA5 is most accurate in Zone 1, while GPCC performs best in other zones, with PDIR consistently underperforming across all zones. GPCC captures interannual precipitation variability well, making it the best overall performer. We recommend ERA5 for real-time monitoring in Zone 1, while GPCC is better suited for long-term studies in areas with dense rain gauge networks. |
| format | Article |
| id | doaj-art-97c5ee308f98412f8ec500d0798b3437 |
| institution | DOAJ |
| issn | 2214-5818 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Hydrology: Regional Studies |
| spelling | doaj-art-97c5ee308f98412f8ec500d0798b34372025-08-20T02:57:44ZengElsevierJournal of Hydrology: Regional Studies2214-58182025-04-015810223410.1016/j.ejrh.2025.102234Evaluation of gridded precipitation datasets over IranMohammad Saeed Najafi0Omid Alizadeh1Tobias Sauter2Department of Water Resources Study and Research, Water Research Institute (WRI), Tehran, IranGeography Department, Humboldt-Universität zu Berlin, Berlin, Germany; Corresponding author.Geography Department, Humboldt-Universität zu Berlin, Berlin, GermanyStudy region: Six climate zones in Iran: Zone 1 (humid Caspian region), Zone 2 (cold and semi-arid northwestern Iran), Zone 3 (mild and semi-humid western Iran), Zone 4 (mild and semi-arid northeastern Iran), Zone 5 (warm and semi-arid southwestern Iran), and Zone 6 (warm and arid eastern, southern, and southeastern Iran). Study focus: This study evaluates the performance of seven gridded precipitation datasets (CRU TS, TMPA 3B43, GPCC, IMERG, MERRA-2, ERA5, and PDIR) against rain gauge data. The accuracy of these datasets in representing precipitation patterns is assessed from 2000 to 2017, with a focus on their performance across diverse climate zones in Iran. New insights for the region: In Zone 1, ERA5 performs best in winter and autumn, while GPCC excels in spring and summer. In Zones 2 and 3, GPCC is the top performer in most seasons, while CRU TS performs best in autumn and winter for Zone 2. In Zone 4, GPCC outperforms all datasets year-round. In Zone 5, TMPA 3B43 performs best in winter, with GPCC slightly outperforming others in other seasons. Overall, ERA5 is most accurate in Zone 1, while GPCC performs best in other zones, with PDIR consistently underperforming across all zones. GPCC captures interannual precipitation variability well, making it the best overall performer. We recommend ERA5 for real-time monitoring in Zone 1, while GPCC is better suited for long-term studies in areas with dense rain gauge networks.http://www.sciencedirect.com/science/article/pii/S2214581825000588Gridded precipitation datasetsRain gauge datasetClimate zonesIranDataset evaluation |
| spellingShingle | Mohammad Saeed Najafi Omid Alizadeh Tobias Sauter Evaluation of gridded precipitation datasets over Iran Journal of Hydrology: Regional Studies Gridded precipitation datasets Rain gauge dataset Climate zones Iran Dataset evaluation |
| title | Evaluation of gridded precipitation datasets over Iran |
| title_full | Evaluation of gridded precipitation datasets over Iran |
| title_fullStr | Evaluation of gridded precipitation datasets over Iran |
| title_full_unstemmed | Evaluation of gridded precipitation datasets over Iran |
| title_short | Evaluation of gridded precipitation datasets over Iran |
| title_sort | evaluation of gridded precipitation datasets over iran |
| topic | Gridded precipitation datasets Rain gauge dataset Climate zones Iran Dataset evaluation |
| url | http://www.sciencedirect.com/science/article/pii/S2214581825000588 |
| work_keys_str_mv | AT mohammadsaeednajafi evaluationofgriddedprecipitationdatasetsoveriran AT omidalizadeh evaluationofgriddedprecipitationdatasetsoveriran AT tobiassauter evaluationofgriddedprecipitationdatasetsoveriran |