Fig. 4: Strength of functional relationships for models and benchmark data.
From: Functional relationships reveal differences in the water cycle representation of global water models
a–f, Spearman rank correlations ρs between forcing variables (precipitation (a,c,e), net radiation (b,d,f)) and water fluxes (actual evapotranspiration (a,b), groundwater recharge (c,d) and total runoff (e,f)), divided into different climate regions. Net radiation for LPJmL and PCR-GLOBWB is not available and is estimated as the median of the other models (per grid cell). The lines connecting the dots are only there as a visual aid. The numbered triangles show rank correlations based on benchmark datasets (grey background) and the Budyko equation, with numbers indicating the corresponding data source (Table 1). Observation-based rank correlations are shown only if they are based on more than 50 data points.
