Fig. 4
Performance of regression models for each ICOS site using eddy covariance measurements from May to September as target variable and shortwave incoming radiation as predictor, with different soil moisture products as a covariate. Panel A shows the R2 for each target variable and Panel B shows the corresponding feature importance based on χ2 for each soil moisture product. For mHM soil moisture, “top” refers to 0–30 cm and “full” refers to 0–200 cm.
