Vulnerability Assessment of Northern Ghana to Climate Variability

Decent Essays

Analysis of an annual rainfall pattern over a 50-year period (1961-2010) showed a general fluctuation in rainfall pattern for all the three regions. The highest rainfall values of 1580mm (NR), 1365mm (UER) and 1543mm (UWR) were recorded in 1991, 1999 and 1963, respectively. The lowest rainfall values of 695mm (NR), 671mm (UER) and 524mm (UWR) were recorded in 1992, 1977 and 1986, respectively. The mean annual rainfall values were 1082.5mm (NR), 990.8mm (UER) and 1035.4mm (UWR) as shown in table II. In spite of the seemingly high rainfall amount recorded in NR over the period, the region showed the highest variability with coefficient of variation (CV) =0.21. The Upper East Region also showed a similar variation in rainfall amount (CV = 0.20). The analysis showed considerable levels of variability in rainfall pattern in all the regions. Such condition may create uncertainty in water availability to crops, and thus pose significant risk to crop production. Temperature pattern Generally, the minimum temperature (Tmin) pattern showed minimal fluctuations over the period, except for 1984 where the lowest value (18.04 oC) was recorded in NR. The means of Tmin series were 22.4 oC for both NR and UWR, and 22.7 oC for UER. The extent of variation in the series indicates the most appreciable amount in NR series (0.04) as against 0.02 and 0.03 for UER and UWR respectively. There were appreciable fluctuations in maximum temperature (Tmax) over the period with two significant dip in

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