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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/9259
Title: Temporal and spatial variability of annual and seasonal rainfall over Ethiopia | Variabilité temporelle et spatiale des précipitations annuelles et saisonnières sur l'Ethiopie
Authors: Wagesho N.
Goel, Narendra Kumar
Jain, Manoj Kumar
Published in: Hydrological Sciences Journal
Abstract: Characterization of the seasonal and inter-annual spatial and temporal variability of rainfall in a changing climate is vital to assess climate-induced changes and suggest adequate future water resources management strategies. Trends in annual, seasonal and maximum 30-day extreme rainfall over Ethiopia are investigated using 0.5° latitude × 0.5° longitude gridded monthly precipitation data. The spatial coherence of annual rainfall among contiguous rainfall grid points is also assessed for possible spatial similarity across the country. The correlation between temporally coinciding North Atlantic Multidecadal Oscillation (AMO) index and annual rainfall variability is examined to understand the underlying coherence. In total 381 precipitation grid points covering the whole of Ethiopia with five decades (1951-2000) of precipitation data are analysed using the Mann-Kendall test and Moran spatial autocorrelation method. Summer (July-September) seasonal and annual rainfall data exhibit significant decreasing trends in northern, northwestern and western parts of the country, whereas a few grid points in eastern areas show increasing annual rainfall trends. Most other parts of the country exhibit statistically insignificant trends. Regions with high annual and seasonal rainfall distribution exhibit high temporal and spatial correlation indices. Finally, the country is sub-divided into four zones based on annual rainfall similarity. The association of the AMO index with annual rainfall is modestly good for northern and northeastern parts of the country; however, it is weak over the southern region.Editor Z.W. Kundzewicz; Associate editor S. UhlenbrookCitation Wagesho, N., Goel, N.K., and Jain, M.K. 2013. Temporal and spatial variability of annual and seasonal rainfall over Ethiopia. Hydrological Sciences Journal, 58 (2), 354-373. © 2013 Copyright 2013 IAHS Press.
Citation: Hydrological Sciences Journal (2013), 58(2): 354-373
URI: https://doi.org/10.1080/02626667.2012.754543
http://repository.iitr.ac.in/handle/123456789/9259
Issue Date: 2013
Keywords: annual rainfall
Ethiopia
seasonal rainfall
spatial autocorrelation
trend analysis
ISSN: 2626667
Author Scopus IDs: 55207365200
36190650800
55555537300
Author Affiliations: Wagesho, N., Department of Water Resources and Irrigation Engineering, Arba Minch University, Arba Minch, Ethiopia
Goel, N.K., Department of Hydrology, Indian Institute of Technology, Roorkee, 247667, India
Jain, M.K., Department of Hydrology, Indian Institute of Technology, Roorkee, 247667, India
Corresponding Author: Wagesho, N.; Department of Water Resources and Irrigation Engineering, Arba Minch University, Arba Minch, Ethiopia; email: nwagesho@gmail.com
Appears in Collections:Journal Publications [HY]

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