Abstract
Abstract Spatiotemporal trends in daily observed precipitation, river discharge, maximum and minimum temperature data were investigated between 1971 and 2013 in the Komadugu-Yobe basin. Significant change points in time series are corrected using Adapted Caussinus-Mestre Algorithm for homogenizing Networks of Temperature series algorithm. Mann–Kendall test and Sen's slope are used to estimate the trend and its magnitude at dry, wet and annual season time scales, respectively. Preliminary results show an increasing trend of the observed variables. There is a latitudinal increase (decrease) in the basin temperature (precipitation) from lower to higher latitudes. The minimum temperature (0.05 °C/year) increases faster than the maximum temperature (0.03 °C/year). Overall, the percentage changes in minimum temperature range between 3 and 10% while that of maximum temperature ranges between 1 and 3%. Due to precipitation dependence on regional characteristics, the highest percentage change was recorded in precipitation with values between −5 and 97%. In all time scales, river discharge and precipitation have strong positive correlations while the correlation between river discharge and temperature is negative. It is imperative to advocate and support positive developmental practices as well as establishing necessary mitigation measures to cope with the effects of climate in the basin.
Highlights
The trend in the homogenized data series is detected by MK trend test and the wavelet spectral (Veleda et al )
The maximum temperature time series (Table 2(b)) are inhomogeneous for all stations while 13 stations are inhomogeneous for minimum temperature time series (Table 2(c)). These change points may be a result of changes in instruments, changes in station location and environment, station network density and structure as well as observation methods (Klein Tank et al )
The highest percentage change in minimum temperature (Figure 4(d)) is observed in Jos (10%) while the lowest is observed in Goure, Magaria and Diffa
Summary
Significant correlations have been observed between monthly mean temperature and precipitation in Europe and North America (Madden & Williams ) This relationship has been extended on a global scale which establishes that high maximum temperatures are accompanied by dry conditions (Trenberth & Shea ). Adeyeri et al ( a) noted a significant positive trend in annual total rainfall, number of consecutive dry days, warm spell duration, warm day and warm night frequencies over the Komadugou-Yobe Basin (KYB). They projected more frequent extreme precipitation and temperature events in the future. The period of analysis for this study is between 1971 and 2013
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