Accurate representation of photosynthesis in terrestrial biosphere models (TBMs) is
essential for robust projections of global change. However, current representations
vary markedly between TBMs, contributing uncertainty to projections of global carbon
fluxes.
● Here we compared the representation of photosynthesis in seven TBMs by examining
leaf and canopy level responses of A to key environmental variables: light, temperature,
carbon dioxide concentration, vapor pressure deficit and soil water content.
● We identified research areas where limited process knowledge prevents inclusion of
physiological phenomena in current TBMs and research areas where data are urgently
needed for model parameterization or evaluation.
● We provide a roadmap for new science needed to improve the representation of
photosynthesis in the next generation of terrestrial biosphere and Earth System Models.