The Boreal Ecosystem Productivity Simulator (BEPS) is a two-leaf enzyme-kinetic model initially developed to estimate the carbon uptake and the water cycle of boreal ecosystems. It has been substantially upgraded since its original release to simulate carbon and water fluxes at an hourly time step over various PFTs. Several inter-model comparisons and site-level validations have shown that BEPS can produce reliable GPP and ET estimates. This version of BEPS model (BEPS-SIF) can simulate the Solar-induced chlorophyll fluorescence at the global level. This SIF scheme was developed based on radiative transfer physics to account for the canopy scattering effects and can be used at the global scale.
Main modules of BEPS-SIF model: beps401b_glb_hr: main program for global simulation
inter_prg: This module is a inter-program between main program and modules
evaporation_canopy: This module calculates evaporation and sublimation from canopy, from overstorey understorey sunlit and shaded leaf
netRadiation: This module calculates net radiation at both canopy level and leaf level
sensible_heat: This module calculates sensible heat from overstorey, understorey and ground
snowpack: This module calculates will calculate sensible heat from overstorey, understorey and ground
surface_temp: This module calculates surface temperature in each step, as well as heat flux for surface to soil layers
transpiration: This module calculates transpiration, from overstorey understorey sunlit and shaded leaf
photosyn_gs: This program solves a cubic equation to calculate leaf photosynthesis and chlorophyll fluorescence. Stomatal conductance is computed with the Ball-Berry model. A global sun-induced fluorescence model considers the multiple scattering effects within a canopy.