Spatio-Temporal Patterns of Rainfall Variability for Wet Season over Togo in West Africa - Open Access Library Journal

OALibJ > Vol.7 No.1, January 2020

Spatio-Temporal Patterns of Rainfall Variability for Wet Season over Togo in West Africa ()

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DOI: 10.4236/oalib.1106044 347 Downloads 1,077 Views Citations

Author(s)

Pouwèréou Nimon^1,2, Latifou Issaou², Yawo Konko¹, Kouami Kokou³

Affiliation(s)

¹West African Science Service Centre on Climate Change and Adapted Land Use, Accra, Ghana.
²National Meteorological Service, Lomé, Togo.
³Laboratory of Forest Research, Faculty of Sciences, University of Lomé, Lomé, Togo.

ABSTRACT

Climate change is affecting rainfall variability. This paper investigated the June-September (JJAS) rainfall variability using reanalyzed and observed da-tasets from 1976 to 2015 in Togo. The rotated empirical orthogonal function (REOF) method was used to get the distribution patterns of JJAS rainfall. The Mann-Kendall (MK) statistic was also used to detect temporal trend of the ro-tated principal component time series (RPCs) that represent the modes of posi-tive loadings. The REOF method has revealed four significant patterns that ex-plained 65.1% of the total variance; the first, the second and the fourth REOF modes exhibit mainly positive loadings, whereas the third exhibits negative loadings. The first mode (REOF1) represents mainly the southern part of Togo; the second mode (REOF2) represents the northern part, the third mode (REOF3) represents the western part and the fourth (REOF4) represents the north-eastern part of Togo. The Mann-Kendall test has revealed an increasing and significant trend of rainfall in the northern region of Togo. In contrast, the trends were not significant in the southern and north-eastern parts of the coun-try. These results form a basis on which adaptation strategies may be taken in this region with high rainfall variability.

KEYWORDS

REOF, Mann-Kendal Test, Rainfall Variability, Togo

Share and Cite:

Nimon, P. , Issaou, L. , Konko, Y. and Kokou, K. (2020) Spatio-Temporal Patterns of Rainfall Variability for Wet Season over Togo in West Africa. Open Access Library Journal, 7, 1-11. doi: 10.4236/oalib.1106044.

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