Analysis of monthly PET series, on the other hand, exhibited a consistent and highly significant upward trend across all months, with the strongest increases observed in June (0.800 mm yr -1 ) and July (0.738 mm yr -1 ), suggesting an increase in atmospheric water demand.
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A 60-year analysis of past hydroclimatic variability and trends in the Mouhoun river catchment in West Africa.
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The sentences
A negative trend (Z < 0) is detected in the annual streamflow time series in Boromo hydrometric station (outlet of MRCB), with a downward trend statistically non-significant.
A positive trend (Z > 0) is detected in the rainfall in all synoptic stations and averaged data over the MRCB, except in Bobo-Dioulasso station (Z < 0).
The positive anomalies of drought indices observed in the 2010s at longer time scales (12- and 24-month) could be due to the intensification of the rainfall regime and an increasing trend in the number of heavy rainfall events in West Africa as reported in previous studies 18 , 19 , 47 .