Fig. 4: The global distribution of CUE and its uncertainty.
From: Global variation in vegetation carbon use efficiency inferred from eddy covariance observations
a–d, The global mean CUE estimated by a random forest model trained on CUEEC (a) and its associated uncertainty (c); the global mean CUE (b) and its uncertainty (d), calculated from the CUE estimates from an ensemble of DGVMs in the TRENDY v.9 project. The uncertainty of CUE in c is defined as 1 s.d. of 1,000 random forest runs, with a bootstrapped CUE value in each run. The uncertainty of CUE in d is defined as 1 s.d. of the CUE estimated from DGVMs.
