Evaluating the Quality of Spatial Data for the Analysis of Climate Variability in the Coastal Region of Nigeria

Agbonaye A. I.* and Izinyon O. C.

Department of Civil Engineering, University of Benin, Benin City, Nigeria

*Corresponding Author: augustine.agbonaye@uniben.edu

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 Vol. 5 No. 1  | March 2021 | Pages 76 – 90

https://doi.org/10.36263/nijest.2021.01.0236   |   Cite this article

Abstract

ABSTRACT

The lack of truly reliable data for climate change analyses and prediction presents challenges in climate modeling. Needed data are required to be hydrologically/statistically reliable to be useful for hydrological, meteorological, climate change, and estimation studies. Thus, data quality and homogeneity screening are preliminary analyses. In this study, the homogeneity of the climatic data used for analyses of climate variability was conducted in the coastal region of Nigeria. Climatic Research Unit (CRU 0.5× 0.5) gridded monthly climatic data for sixty years (1956- 2016) for nine states of the coastal region of Nigeria obtained from internet sources were validated with the Nigerian Meteorological Agency (NiMet) data to assure adequacy for use. The data were tested for normality using the Shapiro-Wilk (S-W) test, D’Agostino-Pearson omnibus test, and skewness test. Four homogeneity test methods were applied to 257 locations in the nine states of the coastal region of Nigeria and they include Pettit’s, Standard Normal Homogeneity Test (SNHT), Buishand’s and Von Neumann Ratio (VNR) tests. The results of the validity analysis indicated that the CRU data are very reliable and thus justified their use for the further analysis carried out in the study. Also, the results obtained indicated that CRU climatic data series were normally distributed and parametric methods could be used in further analysis of the data. Rainfall data homogeneity was detected for Bayelsa, Delta, Edo, Lagos, Ogun, and Ondo states and inhomogeneity for Akwa Ibom, Cross Rivers, and Rivers States. Also, temperature data inhomogeneity was detected for all the states in the study area.

Keywords: Climatic data, Normality, Homogeneity, Climate change, CRU

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Agbonaye A. I. and Izinyon O. C. 2021. Evaluating the Quality of Spatial Data for the Analysis of Climate Variability in the Coastal Region of Nigeria. Nigerian Journal of Environmental Sciences and Technology, 5(1), pp. 76-90. https://doi.org/10.36263/nijest.2021.01.0236


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