Fig. 2: Examples of functional relationships.
From: Functional relationships reveal differences in the water cycle representation of global water models
a, Scatter plots between precipitation and groundwater recharge for PCR-GLOBWB and WaterGAP2. Owing to space constraints, we focus on a few examples with differing relationships. Scatter plots for all variable pairs are shown in Supplementary Figs. 15–20. Each dot represents one grid cell and is based on the 30-year average of each flux. Spearman rank correlations ρs measure the strength of the relationship between forcing and response variables and are calculated for all grid cells within a climate region. The lines connect binned medians (ten bins along the x axis with equal amount of points per bin) for each region. b, The climate regions are shown. The grey dashed line shows the 1:1 line, indicating the water limit assuming all water is supplied by precipitation.
