Figure 9.
The horizontal axis shows years from 1960 to 2020. The vertical axis represents water deficit in millimetres and ranges from 0 to 200. Three seasonal series are displayed. Dry season water deficit generally varies between about 100 and 150 millimetres. Transition season values fluctuate more widely and typically range between about 45 and 170 millimetres. Wet season values remain much lower and generally range between about 0 and 30 millimetres. Dotted trend lines indicate long term trends for each season. The dry season slope equals minus 1.40 millimetres per decade with a confidence interval from minus 3.07 to 0.27. The transition season slope equals 3.80 millimetres per decade with a confidence interval from 0.24 to 7.36. The wet season slope equals 0.95 millimetres per decade with a confidence interval from minus 0.10 to 2.00. The annual values fluctuate across the record while the trend lines indicate a slight decrease for the dry season and increases for the transition and wet seasons.Regional average soil moisture and trends per decade (1960–2020) with 95% confidence intervals for dry, transition and wet seasons, in the Nahouri province, based on TerraClimate data