Abstract
Annual series of light rainfall, moderate rainfall and heavy rainfall are computed for 4 zones arranged from south to north in Nigeria: Coastal, Guinea-Savanna, Midland and Sahelian zones. Daily rainfall data for the period 1919–85 are utilized. Each series is examined for evidence of change in structure in terms of pattern of decrease and increase in dry and wet years, the overall trend, and the occurrence of runs of dry and wet years. The northern Nigeria (Midland and Sahel) heavy rainfall series and the Sahel moderate rainfall series are found to depict evidence of climatic change as defined by Landsberg (1975) that climatic conditions must change to a new equilibrium position with the values of climatic elements changed significantly. On the other hand Landsberg's definition of climatic fluctuations as involving temporary deflection which can revert to earlier conditions is found to fit the 4 regional light rainfall series and the Midland area moderate rainfall series. The southern Nigeria moderate and heavy rainfall series are found to depict only evidence of high frequency oscillations about a stable long-term mean. The recent drought in Nigeria north of about 9° N is shown to be associated with a large decline in moderate and heavy rainfalls over this part of the country.
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References
Acheampong, P. K.: 1982, ‘Rainfall Anomaly along the Coast of Ghana - its Nature and Causes’, Geografiska Annaler 64A (3–4), 199–211.
Acheampong, P. K.: 1987, ‘Rainfall Characteristics over the West African Sahel - the Nigerian Example’, Singapore J. Trop. Geog. 8 (2), 72–83.
Akintola, F.: 1978, ‘The Hydrological Consequences of Urbanization: A Case Study of Ibadan City’, in Sada, P. O. and Oguntoyinbo, J. S. (eds.), Urbanization Processes and Problems in Nigeria, Ibadan Univ. Press, 151–160.
Bryson, R. A.: 1973, ‘Climatic Modification by Air Pollution; II: the Sahelian Effect’, Report No. 9 Inst. Envir. Studies, Univ. of Wisconsin.
Dennett, M. D., Elston, J., and Rodgers, J. A.: 1985, ‘A Reappraisal of Rainfall Trends in the Sahel’, J. Climat. 5, 541–546.
Ilesanmi, O.: 1972, ‘An Empirical Formulation of the Onset, Advance and Retreat of Rainfall in Nigeria’, J. Trop. Geog. 34, 17–24.
Ireland, D. H.: 1962, ‘The Little Dry Season of Southern Nigeria’, Nigerian Geog. J. 5 (1), 7–21.
Kowal, J. M. and Kassam, A. H.: 1975, ‘Rainfall in the Sudan Savanna Region of Nigeria’, Weather 30, 24–28.
Lamb, P. J.: 1980, ‘Sahelian Drought’, New Zealand J. Geog. 68, 12–16.
Lamb, P. J.: 1982, ‘Persistence of Subsaharan Drought’, Nature 299 (5878), 46–48.
Landsberg, H. E.: 1975, ‘Sahel Drought: Change of Climate or Part of Climate?’ Arch. Met. Geoph. Biokl. Ser. B, 23 193–200.
Mitchell, J. M. et al.: 1966, ‘Climatic Change’, WMO Tech. Note 79, Geneva.
Oguntoyinbo, J. S. and Richards, P.: 1977, ‘The Extent and Intensity of the 1969–73 Drought in Nigeria: A Provisional Analysis’, in Dalby, D., Church, J. H. and Bezzez (eds.), Drought in Africa, 2nd ed., International African Inst., London, pp. 114–126.
Ojo, O.: 1977, ‘The Climates of West Africa’, Heinemann Press.
Olaniran, O. J.: 1983, ‘Flood Generating Mechanisms at Ilorin, Nigeria’, GeoJournal 7 (3), 271–277.
Olaniran, O. J.: 1985, ‘On the Distribution of Rainfall in Storms of Different Sizes in Nigeria’, Nigerian Geographical J. 28, 95–113.
Olaniran, O. J.: 1986, ‘The Diurnal Variation of Light, Moderate and Heavy Rainfall at Ilorin, Nigeria’, Weather 41 (8), 251–257.
Olaniran, O. J.: 1987, ‘A Study of the Seasonal Variation of Rain-days of Different Categories in Nigeria in Relation to the Miller Station Types for Tropical Continents’, Theor. and Appl. Climat. 38, 198–209.
Olaniran, O. J.: 1988, ‘The Distribution in Space of Rain-Days of Rainfall of Different Amounts in the Tropics: Nigeria as a Case Study’, Geoforum 19, 507–520.
Olaniran, O. J. and Sumner, G. N.: 1990, ‘Long-term Variation of Annual and Growing Season Rain-falls in Nigeria’, Theor. and Appl. Climat. 41, 41–53.
Stranz, O.: 1978, ‘Rain in Africa and the Drought of Recent Years’, Appl. Sciences and Devt. 11, 49–77.
Walsh, R. P. D., Hulme, M., and Campbell, M. D.: 1988, ‘Recent Rainfall Changes and Their Impact on Hydrology and Water Supply in the Semi-arid Zone of the Sudan’, The Geographical J. 154 (2), 181–198.
Winstanley, D.: 1973, ‘Rainfall Pattern and General Atmospheric Circulation’, Nature 245, 190–194.
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Olaniran, O.J. Evidence of climatic change in Nigeria based on annual series of rainfall of different daily amounts, 1919–1985. Climatic Change 19, 319–340 (1991). https://doi.org/10.1007/BF00140169
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DOI: https://doi.org/10.1007/BF00140169