Fig. 4: Process types recorded by aridity class.
a,b, Stacked bar charts showing fractions of process types recorded as occurring in research watersheds by aridity class for vertically organized process categories from canopy to groundwater (a) and Dunne process categories (infiltration excess, saturation excess or subsurface stormflow) (b). Positive aridity indices indicate humid climates, and negative aridity indices indicate arid climates. White numbers on bars indicate the number of process descriptions in each aridity class.
