Long-term spatial-temporal trends and variability of rainfall over Eastern and Southern Africa

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dc.creatorMuthoni, Francis K.
dc.creatorOdongo, Vincent O.
dc.creatorOchieng, Justus
dc.creatorMugalavai, Edward M.
dc.creatorMourice, Sixbert K.
dc.creatorHoesche-Zeledon, Irmgard
dc.creatorMwila, Mulundu
dc.creatorBekunda, Mateete A.
dc.date2019-08
dc.date2018-12-19T16:15:44Z
dc.date2018-12-19T16:15:44Z
dc.date.accessioned2026-06-27T16:02:29Z
dc.descriptionThis study investigates the spatial-temporal trends and variability of rainfall within East and South Africa (ESA) region. The newly available Climate Hazards group Infrared Precipitation with Stations (CHIRPS-v2) gridded data spanning 37 years (1981 to 2017) was validated against gauge observations (N = 4243) and utilised to map zones experiencing significant monotonic rainfall trends. Standardised annual rainfall anomalies revealed the spatial-temporal distribution of below and above normal rains that are associated with droughts and floods respectively. Results showed that CHIRPS-v2 data had a satisfactory skill to estimate monthly rainfall with Kling-Gupta efficiency (KGE = 0.68 and a high temporal agreement (r = 0.73) while also preserving total amount (β = 0.99) and variability (γ = 0.8). Two contiguous zones with significant increase in annual rainfall (3–15 mm year−1) occurred in Southwest Zambia and in Northern Lake Victoria Basin between Kenya and Uganda. The most significant decrease in annual rainfall (− 20 mm year−1) was recorded at Mount Kilimanjaro in Tanzania. Other significant decreases in annual rainfall ranging between − 4 and − 10 mm year−1 were observed in Southwest Tanzania, Central-South Kenya, Central Uganda and Western Rwanda. CHIRPS-v2 rainfall product provides reliable high spatial resolution information on amount of rainfall that can complement sparse rain gauge network in rain-fed agricultural systems in ESA region. The observed spatial-temporal trends and variability in rainfall are important basis for guiding targeting of appropriate adaptive measures across multiple sectors.
dc.identifierhttps://hdl.handle.net/10568/98834
dc.identifier.urihttp://hdl.handle.net/123456789/120795
dc.languageen
dc.publisherSpringer
dc.rightsOpen Access
dc.sourceMuthoni, F.K., Odongo, V.O., Ochieng, J., Mugalavai, E.M., Mourice, S.K., Mourice, I., Mwila, M. and Bekunda, M. 2018. Long-term spatial-temporal trends and variability of rainfall over Eastern and Southern Africa. Theoretical and Applied Climatology
dc.subjectfarming systems
dc.subjectintensification
dc.subjectclimate change
dc.subjectwater
dc.titleLong-term spatial-temporal trends and variability of rainfall over Eastern and Southern Africa
dc.typeJournal Article

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Instituto Internacional de Agricultura Tropical (IITA)