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The trends of the mean diurnal cycle of gross primary production (GPP; a–f) retrieved by NNC‐part (black line), daytime method (DT; red line), and nighttime method (NT; green line). The differences between diurnal cycle of retrieved GPP are also shown (g–l): NNC‐part‐DT (red line), NNC‐part‐NT (green line), and NT‐DT (dashed blue line). Only FLUXNET2015 study sites at northern hemisphere (latitude > +15°N), having at least 2 years of data, were used for the analysis
