Accuracy of the CMORPH satellite-rainfall product over Lake Tana Basin in eastern Africa
In this study, we assessed the accuracy of rainfall occurrence, amount and distribution over the Lake Tana basin in Ethiopia, Eastern Africa, as represented in the NOAA satellite-based Climate Prediction Center Morphing technique (CMORPH) rainfall product. This analysis is carried out at high spatia...
| Autores principales: | , , |
|---|---|
| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
Elsevier
2015
|
| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/77508 |
| _version_ | 1855534477808238592 |
|---|---|
| author | Haile, Alemseged Tamiru Yan, F. Habib, E. |
| author_browse | Habib, E. Haile, Alemseged Tamiru Yan, F. |
| author_facet | Haile, Alemseged Tamiru Yan, F. Habib, E. |
| author_sort | Haile, Alemseged Tamiru |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | In this study, we assessed the accuracy of rainfall occurrence, amount and distribution over the Lake Tana basin in Ethiopia, Eastern Africa, as represented in the NOAA satellite-based Climate Prediction Center Morphing technique (CMORPH) rainfall product. This analysis is carried out at high spatial and temporal resolutions (8 × 8 km2 and daily) using observations from rain gauges as a reference for the period covering January 2003 to December 2006. Graphical comparisons and several statistical metrics such as bias, correlation coefficient, and standard deviation of rainfall differences are used to perform the evaluation analysis. Spatial maps of these statistical metrics were developed to assess the spatial dependency in the CMORPH accuracy. The bias is decomposed into different components, hit, missed, and false, in order to gain additional insight into the possible sources of systematic deviations in CMORPH. Overall, CMORPH was able to capture the seasonal and spatial patterns of rainfall over the basin, but with varying degrees of accuracy that depend on topography, latitude and lake-versus-land conditions within the basin. The results show that CMORPH captured rain occurrence relatively well in both wet and dry seasons over the southern part of the basin but it significantly overestimated those over the lake and its southern shore. The bias of CMORPH in the study area is characterized by seasonal and spatial variations (-25 to 30% in wet season and -40 to 60% in dry season). False as well as missed rains contribute significantly to the total rainfall amounts over the basin. Significant levels of the differences are observed at the daily resolution of CMORPH. The relation between CMORPH and gauge rainfall amounts is stronger (correlationmostly N0.4) in thewet season than in the dry (mostly b0.4). |
| format | Journal Article |
| id | CGSpace77508 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| publisher | Elsevier |
| publisherStr | Elsevier |
| record_format | dspace |
| spelling | CGSpace775082025-06-17T08:24:02Z Accuracy of the CMORPH satellite-rainfall product over Lake Tana Basin in eastern Africa Haile, Alemseged Tamiru Yan, F. Habib, E. rain satellites river basins lakes remote sensing spatial distribution wet season dry season In this study, we assessed the accuracy of rainfall occurrence, amount and distribution over the Lake Tana basin in Ethiopia, Eastern Africa, as represented in the NOAA satellite-based Climate Prediction Center Morphing technique (CMORPH) rainfall product. This analysis is carried out at high spatial and temporal resolutions (8 × 8 km2 and daily) using observations from rain gauges as a reference for the period covering January 2003 to December 2006. Graphical comparisons and several statistical metrics such as bias, correlation coefficient, and standard deviation of rainfall differences are used to perform the evaluation analysis. Spatial maps of these statistical metrics were developed to assess the spatial dependency in the CMORPH accuracy. The bias is decomposed into different components, hit, missed, and false, in order to gain additional insight into the possible sources of systematic deviations in CMORPH. Overall, CMORPH was able to capture the seasonal and spatial patterns of rainfall over the basin, but with varying degrees of accuracy that depend on topography, latitude and lake-versus-land conditions within the basin. The results show that CMORPH captured rain occurrence relatively well in both wet and dry seasons over the southern part of the basin but it significantly overestimated those over the lake and its southern shore. The bias of CMORPH in the study area is characterized by seasonal and spatial variations (-25 to 30% in wet season and -40 to 60% in dry season). False as well as missed rains contribute significantly to the total rainfall amounts over the basin. Significant levels of the differences are observed at the daily resolution of CMORPH. The relation between CMORPH and gauge rainfall amounts is stronger (correlationmostly N0.4) in thewet season than in the dry (mostly b0.4). 2015-09 2016-11-01T13:39:37Z 2016-11-01T13:39:37Z Journal Article https://hdl.handle.net/10568/77508 en Limited Access Elsevier Haile, Alemseged Tamiru; Yan, F.; Habib, E. 2015. Accuracy of the CMORPH satellite-rainfall product over Lake Tana Basin in eastern Africa. Atmospheric Research, 163:177-187. doi: https://doi.org/10.1016/j.atmosres.2014.11.011 |
| spellingShingle | rain satellites river basins lakes remote sensing spatial distribution wet season dry season Haile, Alemseged Tamiru Yan, F. Habib, E. Accuracy of the CMORPH satellite-rainfall product over Lake Tana Basin in eastern Africa |
| title | Accuracy of the CMORPH satellite-rainfall product over Lake Tana Basin in eastern Africa |
| title_full | Accuracy of the CMORPH satellite-rainfall product over Lake Tana Basin in eastern Africa |
| title_fullStr | Accuracy of the CMORPH satellite-rainfall product over Lake Tana Basin in eastern Africa |
| title_full_unstemmed | Accuracy of the CMORPH satellite-rainfall product over Lake Tana Basin in eastern Africa |
| title_short | Accuracy of the CMORPH satellite-rainfall product over Lake Tana Basin in eastern Africa |
| title_sort | accuracy of the cmorph satellite rainfall product over lake tana basin in eastern africa |
| topic | rain satellites river basins lakes remote sensing spatial distribution wet season dry season |
| url | https://hdl.handle.net/10568/77508 |
| work_keys_str_mv | AT hailealemsegedtamiru accuracyofthecmorphsatelliterainfallproductoverlaketanabasinineasternafrica AT yanf accuracyofthecmorphsatelliterainfallproductoverlaketanabasinineasternafrica AT habibe accuracyofthecmorphsatelliterainfallproductoverlaketanabasinineasternafrica |