Authors
Getachew Tesfaye Ayehu, Tsegaye Tadesse, Berhan Gessesse, Tufa Dinku
Publication date
2018/4/6
Journal
Atmospheric Measurement Techniques
Volume
11
Issue
4
Pages
1921-1936
Publisher
Copernicus Publications
Description
Accurate measurement of rainfall is vital to analyze the spatial and temporal patterns of precipitation at various scales. However, the conventional rain gauge observations in many parts of the world such as Ethiopia are sparse and unevenly distributed. An alternative to traditional rain gauge observations could be satellite-based rainfall estimates. Satellite rainfall estimates could be used as a sole product (e.g., in areas with no (or poor) ground observations) or through integrating with rain gauge measurements. In this study, the potential of a newly available Climate Hazards Group Infrared Precipitation with Stations (CHIRPS) rainfall product has been evaluated in comparison to rain gauge data over the Upper Blue Nile basin in Ethiopia for the period of 2000 to 2015. In addition, the Tropical Applications of Meteorology using SATellite and ground-based observations (TAMSAT 3) and the African Rainfall Climatology (ARC 2) products have been used as a benchmark and compared with CHIRPS. From the overall analysis at dekadal (10 days) and monthly temporal scale, CHIRPS exhibited better performance in comparison to TAMSAT 3 and ARC 2 products. An evaluation based on categorical/volumetric and continuous statistics indicated that CHIRPS has the greatest skills in detecting rainfall events (POD  0.99, 1.00) and measure of volumetric rainfall (VHI  1.00, 1.00), the highest correlation coefficients ( 0.81, 0.88), better bias values (0.96, 0.96), and the lowest RMSE (28.45 mm dekad, 59.03 mm month) than TAMSAT 3 and ARC 2 products at dekadal and monthly analysis, respectively. CHIRPS overestimates the …
Total citations
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Scholar articles
GT Ayehu, T Tadesse, B Gessesse, T Dinku - Atmospheric Measurement Techniques, 2018