Integrated Enhanced Canopy Radiative Transfer and Soil Water Dynamics Improved the Simulation of Terrestrial Ecosystem Functioning

Plant responds to water stress is a vital process that influences terrestrial energy, water, and carbon exchanges. At the soil, vegetation, and atmosphere interfaces, soil water availability regulates the dynamics of vegetation growth, which can be remotely monitored by satellites, using the soilplant relationship proxy solar-induced chlorophyll fluorescence. However, most current canopy photosynthesis and fluorescence models do not address soil water status completely, which compromises their applications at dry and semi-dry areas. To overcome this issue, we established a coupled modelSTEMMUS-SCOPE, which integrated photosynthesis, fluorescence emission, and transfer of energy, mass, and momentum in the soilplantatmosphere continuum system, via a resistance scheme linking soil, roots, leaves, and the atmosphere. STEMMUS-SCOPE was not only evaluated at short vegetation (crop and grass) sites, but also assessed at high vegetation sites (evergreen broadleaf forest, evergreen needleleaf forest, and deciduous broadleaf forest). The results indicated that the simulation of land surface fluxes was significantly improved by the coupled model, especially when the canopy experienced water stress. This finding highlights the importance of enhanced soil heat and moisture transfer on simulating terrestrial ecosystem functioning.