Fig. 2: Rainfall origins and their variability during 1982–2018.

a, c Climatological evaporation contribution to precipitation (E2P) in ACR and SBR, i.e. the average amount of surface evaporation that ends up as precipitation in these two studied regions. b, d Long-term change in E2P in ACR and SBR, calculated by multiplying the linear trends (mm per year) by 37 years, i.e. the length of the period considered in the study. Significant trends (p < 0.05) are highlighted with black hatches.