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| Titel |
Comparison of rainfall estimations by TRMM 3B42, MPEG and CFSR with ground-observed data for the Lake Tana basin in Ethiopia |
| VerfasserIn |
A. W. Worqlul, B. Maathuis, A. A. Adem, S. S. Demissie, S. Langan, T. S. Steenhuis |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 18, no. 12 ; Nr. 18, no. 12 (2014-12-05), S.4871-4881 |
| Datensatznummer |
250120546
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| Publikation (Nr.) |
 copernicus.org/hess-18-4871-2014.pdf |
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| Zusammenfassung |
| Planning for drought relief and floods in developing countries is greatly
hampered by the lack of a sufficiently dense network of weather stations
measuring precipitation. In this paper, we test the utility of three
satellite products to augment the ground-based precipitation measurement to
provide improved spatial estimates of rainfall. The three products are the
Tropical Rainfall Measuring Mission (TRMM) product (3B42), Multi-Sensor
Precipitation Estimate–Geostationary (MPEG) and the Climate Forecast System
Reanalysis (CFSR). The accuracy of the three products is tested in the Lake
Tana basin in Ethiopia, where 38 weather stations were available in 2010 with
a full record of daily precipitation amounts. Daily gridded satellite-based
rainfall estimates were compared to (1) point-observed ground rainfall and
(2) areal rainfall in the major river sub-basins of Lake Tana. The result
shows that the MPEG and CFSR satellites provided the most accurate rainfall
estimates. On average, for 38 stations, 78 and 86% of the observed
rainfall variation is explained by MPEG and CFSR data, respectively, while
TRMM explained only 17% of the variation. Similarly, the areal
comparison indicated a better performance for both MPEG and CFSR data in
capturing the pattern and amount of rainfall. MPEG and CFSR also have a lower
root mean square error (RMSE) compared to the TRMM 3B42 satellite
rainfall. The bias indicated that TRMM 3B42 was, on average, unbiased,
whereas MPEG consistently underestimated the observed rainfall. CFSR often
produced large overestimates. |
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