Fig.2. Comparison of cumulative GPP estimates from the flux towers and the models. The color lines represent the GPP value of cumulative comparison between the EC-tower and model for each site. The red dashed line is the 1:1 reference to the differences of modeled GPP and EC-tower. Inset histogram shows the frequency distribution of the percentage biases (PB). The two shadowed plots are two new models developed in this study.