Spatio-temporal variability and trends of precipitation and extreme rainfall events in Ethiopia in 1980-2010

摘要: This article summarizes the results from an analysis conducted to investigate spatio-temporal variability and trends in rainfall over Ethiopia a period of 31 years 1980 2010. The data is mostly observed station supplemented by bias-corrected AgMERRA climate data. Changes annual Belg (March–May) Kiremt (June September) season rainfalls rainy days have been analysed entire Ethiopia. Rainfall characterized high temporal with coefficient variation (CV, %) varying 9 30% annual, 69% during 15–55% amounts. increased disproportionately as amount declined 700 100 mm or less. No significant trend was amounts country, but increasing decreasing were seasonal some areas. A declining also number especially Oromia, Benishangul-Gumuz Gambella regions. Trends indicated general decline increase main along decrease leads extreme events 95th-percentile illustrate that are eastern south-western parts covering Oromia During season, central extending towards southern part country while they (covering Borena, Guji, Bali, west Harerge east Harerge), Somali, Gambella, Tigray Afar intensity south-eastern south-west Somali Similar greatest 3-, 5- 10-day consecutive dry wet showed seasons decreased significantly many areas increased. consistency large spatial confirms robustness serves basis for understanding projected changes climate. These discussed relation their significance agriculture.