Document Type : Original Article

Author

Department of Geography, Faculty of Social Science, University of Lagos, Lagos, Nigeria

10.52293/WES.3.1.3651

Abstract

Change in rainfall is one of the most critical factors in determining the impact of climate change on Abia state. Annual rainfall data was acquired from HadCM3 baseline and future scenarios between 1972 and 2050 for Abia state. Analysis was performed using Geographical Information System (GIS) and statistical techniques. Descriptive statistics were extracted using statistical methods while for spatial rainfall distribution, standard deviation and coefficient of variation were mapped using GIS interpolation methods. For baseline scenario between 1972 and 2015, annual rainfall minimum, maximum, mean, variability, standard deviation and co-efficient of variation in the southern part of Abia state is relatively higher than the northern part of the state which is lower compared to future scenario between 2015 and 2050. Significant changes in rainfall between 2015 to 2050 in-relation to its distribution pattern (using Log Pearson Type III probability distribution) in-terms of its frequency, climate extremes and extreme events is higher than 1972 to 2015. This change in rainfall implies that in Abia state an increase in heavy rainfall with a 0.2% chance exceedance annual rainfall event is likely to become a 0.5% chance exceedance event in many regions with a higher emissions scenarios leading to a greater projected decrease in return period. Finally, water requirement for various crops were studied in-relation to effective rainfall and the results reveals that crops receive a high probability of critical rainfall amount in a given year needed for growth between 1972 and 2050. This study provides information on rainfall trend on a long-term basis and impact of climate change on Abia state which will be very useful for water resource management, agriculture and economic development of the region.

Keywords

Adejuwon, J.O. (2004). Crop yield response to climate variability in the sudano-sahelian ecological zones of Nigeria in southwestern Nigeria. In AIACC Report of Workshop for Africa and Indian Ocean Island. Dakar, Senegal (pp.15-16).
Arvind, G., Kumar, P.A., Karthi, S.G., & Suribabu, C.R. (2017). Statistical analysis of 30 years rainfall data: A case study. IOP Conf. Ser.: Earth Environ. Sci., 80, 012067. DOI:10.1088/1755-1315/80/1/012067
Awosika, L., Ojo, O., & Ajayi, T. (1994). Implications of climate change and sea level rise on the Niger Delta, Nigeria – Phase 1.United Nations Environmental Programme OKAPIS/UNEPreport.
Ayode, J.O. (1983). Introduction to Climatology for the Tropics. 1st Published. Spectrum Books/John Wiley and Sons.
Dan’azumi, S., Shamsudin, S., & Rahman, A.A. (2010). Probability distribution of rainfall depth at hourly time-scale. Engineering and Technology, 48.
Davie, T. (2008). Fundamentals of Hydrology. 2nd Edition. Routledge Fundamentals of physical Geography.
Fisher, R.A. (1924). The influence of the rainfall on the yield of wheat at Rothamsted. Philosophical transaction of the Royal Society of London Series B (213).
Food and Agriculture Organiation (FAO). (2001). Climate variability and change: A challenge for sustainable agricultural production. Committee on Agriculture. https://www.fao.org/DOCREP/MEETING/003/X9177e.HTM
Gupta, S.K., Babu, R., & Tejwani, K.G. (1975). Weekly rainfall of India for planning cropping programme . Soil Conserv. Digest, 3(1), 31-39.
Hauser, S., Wairegi, L., Asadu, C.L.A., Asawalam, D.O., Jokthan, G., & Ugbe, U. (2014). Cassava system cropping guide. Africa Soil Health Consortium. Ignaciuk, A., & Mason-D’Croz, D. (2014). Modelling adaptation to climate change in agriculture (No. 70). Paris: OECD Publishing. http://dx.doi.org/10.1787/5jxrclljnbxq-en
Iheoma, C.G. (2015). Impact of climate change on agricultural production and sustainability in Nigeria. Asian Journal of Agricultural Extension, Economics & Sociology, 4(1), 29-41. DOI:10.9734/AJAEES/2015/11518
Jackson, I.J. (1989). Climate, water and agriculture in the tropics. Longman Scientific and Technical.

Knoth, J.(1993). Traditional storage of yams and cassava and its improvement. GTZ-Postharvest Project. https://www.nzdl.org/gsdlmod%3Fe%3Dd-00000-00
Mohita, A.S., & Jaib, S. (2010). Use of probability distribution in rainfall analysis. New York Science Journal, 3(9). http://www.sciencepub.net/newyork
Obasi, G.O.P. (2003 March 31). Statement at the International Symposium on Climate Change (ISCC) Beijing, China.
Ochieng, J., Kirimi, L., & Mathenge, M. (2016). Effects of climate variability and change on agricultural production: The case of Small scale farmers in Kenya. Life Sci., 77, 71–78.
Pankhurst, R., & Johnson, D.H.(1988). The great drought and famine of 1888-92 in northeast Africa. In The ecology of survival: case studies from northeast African history. Johnson D H, Anderson D M (Eds.) (pp. 47-72). Lester Crook Academic Publishing.
Poku, K. & FAO(Food and Agriculture Organizations). (2002). Small-scale palm oil processing in Africa. Rome: Food and Agriculture Organizations of the United Nation. www.fao.org/DOCREP/005/Y4355E/y4355eoohtm-content
Raudkivi, A.J. (1979). Hydrology: An introduction to hydrological processes and modeling. Pergamum press.
Sikka, D.R. (1977). Some aspects of the life history, structure and movement of monsoon depression. Pageoph, 115, 1501–1529.
Tarekmerabtene, M.S., & Abdallah, S. (2016). Assessment of seasonal and annual rainfall trends and variability in Sharjah city, UAE. Advances in Meteorology, 2016, 13. http://dx.doi.org/10.1155/2016/6206238
Taoa, D.Q., Nguyena, V.T.V., & Bourqueb, A. (2002 Juin 5-8). On selection of probability distributions for representing extreme precipitations in southern Quebec. [Paper presentation at] Annual Conference of the Canadian Society for Civil Engineering, Montréal, Québec, Canada.
Thompson, L.M. (1975). Weather variability, climatic change and food production. Science, 188, 535-541.
Thakural, L.N., Kumar, S., Jain, S.K., & Ahmad, T. (2018). The impact of climate change on rainfall variability: A study in central Himalayas. In: Singh, V.P., Yadav, S., Yadava, R.N. (Eds.), Climate Change Impacts (pp. 181–192). Springer.
Udayashankara, T.H., Murthy, B.M.S., & Madhukar, M.(2016). Impact of climate change on rainfall pattern and reservoir level. Journal of Water Resource Engineering and Management, 3(1).
Von Braun, J. (1991). A policy agenda for famine prevention in Africa (Statement No.13). Washington, DC: International Food Policy Research Institute.