Fig. 1

Comparison of original and bias-adjusted MERRA-2 data with GEBA observations. (a) monthly mean diffuse radiation (K↓,d) and (b) total shortwave radiation (K↓,) from MERRA-2 as well as the bias-adjusted estimates from the kt,R, MLR, and RF models. For the bias-adjusted estimates, the consolidated validation data from all 10 folds are shown. The red dashed lines represent the 1:1 relationship. Color indicates data density and the statistical summaries of the evaluations are noted.