Results and Discussion

y = a + bx to approximate the given set of data, where

where

Extensive work has been carried out on the rainfall and temperature situations in Nigeria but research work on the possible fallout of the interplay between rainfall and temperature in Nigeria appears scanty.

Seasonal variations of rainy days of different categories in Nigeria, changing pattern or rainy days in Nigeria (Olaniran, 1990), regional variations in fluctuations of seasonal rainfall over Nigeria, variation of surface temperature with solar activity are few of the many researches that have been carried out on temperature and rainfall. Adedoyin (1989) carried out a research on the global scale sea-surface temperature anomalies and rainfall characteristics but with emphasis on northern Nigeria. The present work covers the entire country and the results are presented according to the geographical regions of the country. The least squares regression plots for all the zones are as shown in Figures 38.2a,b,c,d,e,f.

140 120 100 80 60 40

140 120 100 80 60 40

Year

Fig. 38.2.a Least squares regression plots for the north central zone.

TO 2 CD

Fig. 38.2.a Least squares regression plots for the north central zone.

T-COLOt^Oi-'-COLOt^CTl-'-COLOt^OJ t^t^t^t^t^COCOCOCOC005CT)CT)CT)03 OiOiOiOiOiOiOiOiOiOiOiOiOiOiOJ

Year

Fig. 38.2.c Least squares regression plots for the south-south zone.

Year

Fig. 38.2.c Least squares regression plots for the south-south zone.

Year

H-1—I-1-1-1—I-1—I-1-1-1—I-1-1—I-1-1—I-1-1-1—I-1-1-1—I-1—I-

^COCOOCM^COCO

H-1—I-1-1-1—I-1—I-1-1-1—I-1-1—I-1-1—I-1-1-1—I-1-1-1—I-1—I-

^COCOOCM^COCO

Year

Fig. 38.2.e Least squares regression plots for the southeast zone.

AvRfall y = 0.8297x + 45.333 R2 = 0.1895 AvgTmp y = 0.0465x + 27.08 R2 = 0.3999

Fig. 38.2.e Least squares regression plots for the southeast zone.

AvRfall y = 0.8297x + 45.333 R2 = 0.1895 AvgTmp y = 0.0465x + 27.08 R2 = 0.3999

25.5

H—I—I—I—I—I—I—I—I—I—I—I—I—I—I—I—I—I—I—I—I—I—I—I—I—I—h T-coior^oiT-coior^CTiT-coior^CTi r^r^r^r^r^cococococooioioioicn

OiCTiOiCTiOiCTiOiCTiOiCTiOiOiOiOiCTi

25.5

Year

Table 38.2 below is the tabular representation of the least square regression analysis of the rainfall/temperature variations at six geopolitical zones of the country.

Table 38.2 Regression analysis results of the rainfall/temperature variations.

S/N

Zone

Rainfall variation/

Temperature variation/

annum(mm)

annum (oC)

1

North central

-0.5987

0.0455

2

Northeast

0.0848

0.0081

3

Northwest

0.8297

0.0465

4

Southeast

-0.2873

0.0402

5

South-South

4.0407

0.0183

6

Southwest

0.5867

0.0204

From Table 38.2 above, the North Central and South East geopolitical zones witnessed negative regression in the rainfall trend while all other zones witnessed a positive trend; The temperature variations in all the zones regressed positively. In effect, only the North Central and South East geopolitical zones witnessed a decrease in the rainfall pattern; all other geopolitical zones experienced some increase. The temperature situation in all the geopolitical zones was of increasing trend.

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