American Journal of Earth and Environmental Sciences  
Manuscript Information
 
 
Temporal Variations of Selected Climatic Parameters in Osogbo, Nigeria for the Period of four Decades (1975–2014)
American Journal of Earth and Environmental Sciences
Vol.2 , No. 1, Publication Date: May 5, 2019, Page: 9-14
127 Views Since May 5, 2019, 65 Downloads Since May 5, 2019
 
 
Authors
 
[1]    

Salami Afeez Alabi, Department of Geography and Environmental Management, University of Ilorin, Ilorin, Nigeria.

 
Abstract
 

Drastic changes in society such as fast urbanization, globalization, economic changes and the need for more sustainable solutions for spatial problems lead to new urban forms. These have led to changes in the climatic parameters which are most noticeable effects of climate. To study the changes and/or patterns of climatic elements in the study area, the paper examined the temporal variations of some climatic parameters in Osogbo, Nigeria for a period of 40 years (1975-2014). The patterns of climatic parameters in the study area over the four decades were studied for any observable changes. The selected climatic data were collected from the archive of Nigerian Meteorological Agency (NIMET), Oshodi, Lagos and analysed using Mann-Kendall trend test. The results obtained revealed that there are positive trends in mean annual temperature (minimum and maximum) with Zs statistics (τ/στ) values 2.14 and 2.44 which are outside the limit of +/-1.96. The result also revealed that rainfall amount was statistically significant over the period of 1975-2014 with τ/ στ value 2.07 while relative humidity showed a negative trend and significant decrease with Zs statistics (τ/στ) value -1.48. These changes in temperatures can influence precipitation characteristics and indirectly affect the flux and storage of water in surface and subsurface reservoirs. This study noted that factors responsible for changes in rainfall include fluctuation in evapotranspiration, nature of the surface, air masses and human activities such as construction, felling of trees, and release of pollutants into the air. The study concludes that, if actions are not taken, changes in climatic parameters would pose challenges on socio-economic, health, agriculture, as well as human discomfort in the study area. Therefore, there should be a number of strategies for developing and integrating Green Infrastructure (GI) in human settlement.


Keywords
 

Climate, Mann-Kendall, Statistically Significant, Variability, Nigeria


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