Figure 3. Cluster analysis (self-organizing maps) plot in evaporative index (actual evapotranspiration/precipitation¹⁶⁶) as a function of dryness index (potential evapotranspiration.

¹⁸⁰/precipitation). Actual evapotranspiration (AET) was calculated as the difference between precipitation and streamflow¹⁸¹. Small dots are sites in cluster analysis with colors representing corresponding cluster assignments. Inset, magnitude estimates of cluster assignments as a function of aridity index. Error bars are 1 SD. Also shown is the generalized climate classification scheme for global aridity index¹⁸⁰ and map of magnitude of groundwater influence over potential evapotranspiration (PET) layer (mm y⁻¹) annual average 1950–2000¹⁸⁰. Map was generated using ArcMap 10.2 (http://services.arcgisonline.com/arcgis/rest/services/World_Street_Map/MapServer).