Flux measurements from eight global FLUXNET sites were used to estimate parameters in a process‐based, land‐surface model (CSIRO Biosphere Model (CBM), using nonlinear parameter estimation techniques. The parameters examined were the maximum photosynthetic carboxylation rate ( ) the potential photosynthetic electron transport rate ( j max, 25 ) of the leaf at the top of the canopy, and basal soil respiration ( r s, 25 ), all a...

Models of mass and energy exchanges between the biosphere and the atmosphere generally contain a nonlinear dependence between fluxes and model parameters, and thus estimation of these parameters from measurements in a heterogeneous landscape depends on the scale of the observations. The scale‐dependence of a typical surface‐exchange model (the CSIRO Biospheric Model, CBM) is examined using the diurnal variation of hourly fluxe...