Figure 7.
The horizontal axis shows years from 1960 to 2020. The vertical axis represents evapotranspiration in millimetres and ranges from 100 to 200. Three seasonal series are plotted. Dry season evapotranspiration generally ranges between about 140 and 175 millimetres. Transition season evapotranspiration typically ranges between about 160 and 195 millimetres. Wet season evapotranspiration remains lower and generally varies between about 110 and 150 millimetres. Dotted trend lines represent long term trends for each season. The dry season slope equals minus 1.61 millimetres per decade with a confidence interval from minus 2.69 to minus 0.53. The transition season slope equals 0.78 millimetres per decade with a confidence interval from minus 0.55 to 2.10. The wet season slope equals 3.05 millimetres per decade with a confidence interval from 2.26 to 3.84. The values fluctuate over time while the trend lines indicate decreasing evapotranspiration in the dry season and increasing evapotranspiration in the transition and wet seasons.Regional average evapotranspiration and trends per decade (1960–2020) with 95% confidence intervals for dry, transition and wet seasons, in the Nahouri province, based on TerraClimate data