A modified two-leaf light use efficiency model for improving the simulation of GPP using a radiation scalar

Two-leaf light use efficiency (TL-LUE) models are efficient methods to simulate regional and global gross primary productivity (GPP). A TL-LUE model has previously been shown to outperform the big-leaf MOD17 model through separate consideration of the contributions of sunlit and shaded leaves. However, the impacts of radiation intensity on LUE are inadequately considered in the TL-LUE model, and the maximum LUEs of sunlit and shaded leaves are …