Effects of canopy photosynthesis saturation on the estimation of gross primary productivity from MODIS data in a tropical forest

► MODIS GPP product was evaluated at a flux tower site in a tropical rainforest. ► Uncertainties of MODIS GPP were traced to the inputs of the MODIS GPP algorithm. ► Potentials for MODIS GPP product enhancement were demonstrated. ► Alternative approach for light use efficiency adjustment was suggested. ► Consideration of canopy photosynthesis saturation improves MODIS GPP.