Space-time variability of extreme rainfall in the River Nile basin
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Date
2017
Authors
Journal Title
Journal ISSN
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Publisher
International Journal of Climatology
Abstract
In this study, spatio-temporal variability in daily rainfall extremes based on 0.5∘ × 0.5∘ gridded data over the
Nile basin was analysed using the quantile perturbation method. The co-occurrence of the extreme rainfall variability with
the variation in the large-scale ocean–atmosphere conditions was also investigated. Based on a 15-year moving window, it
was found that the extreme rainfall shows oscillatory behaviour over multi-decadal time scales. The latitudinal difference in
the multi-decadal extreme rainfall oscillations divides the study area into the Northern, Central, and Southern regions. The
variability in the extreme rainfall of the Central region is dominantly driven by the variation in the sea surface temperatures of
the Atlantic and Pacific Oceans. For the Southern region, extreme rainfall variability is linked to the anomalies in the sea level
pressure of the North Atlantic Ocean and the variation in the sea surface temperature of the Indian Ocean. The variation in the
extreme rainfall of the Northern region corresponds to the anomalies in sea surface temperatures of the Indian and Atlantic
Oceans as well as from the Pacific Ocean.
Description
Keywords
Climate variability, Climate indices, Rainfall variability, River Nile basin, Quantile perturbation method, Rainfall extremes
Citation
Onyutha, C., & Willems, P. (2017). Space‐time variability of extreme rainfall in the River Nile basin. International Journal of Climatology , 37 (14), 4915-4924. DOI: 10.1002/joc.5132