FIGURE 3.

The mean seasonal cycles of gross primary production (GPP; a) and ecosystem respiration (RECO; c) obtained by NN_C‐part, daytime method, and nighttime method. The consistency among methods was evaluated by the determination coefficients (R ²) among the seasonal patterns of GPP (b) and RECO (d) per International Geosphere–Biosphere Programme (IGBP) vegetation class (the number in brackets after each IGBP vegetation class stands for the number of sites in each category). Only FLUXNET2015 study sites at northern hemisphere (latitude > +15°N) were used for that analysis. The vegetation classes are the same as Table 1