Fig.1. The Taylor diagram showing (a) the performance of all model data from EC-towers were used.; (b-e) the performance of all model under different latitudes, where N and S represent the northern and southern hemispheres, respectively. Color dots represent the models in the corresponding legend. Taylor diagram is a polar graph in which the cosine of the angle between the X-axis is the correlation coefficient between the GPP of the model and EC-tower. The radial direction is the ratio of model to EC-tower GPP standard deviation. The grey arcs represent RMSE normalized by standard deviation for each model. The n is number of EC-towers.