Universal Mathematical Model of Greenhouse Gas Absorption

The parametric model for estimating the annual carbon budget in terrestrial photoautotrophic ecosystems of the temperate zone is proposed and tested, based on the conceptual separation of gross primary production (GPP) and ecosystem respiration (R), which enables calculation of net ecosystem productivity (NEP). It is noted that the key element of the model is the parameterization of GPP, which accounts for the influence of photosynthetically active radiation (PAR) through a modified light-use efficiency approach, as well as dependence on air temperature, vapor pressure deficit (VPD), and atmospheric CO₂ concentration. It is concluded that the developed approach, having a relatively simple structure, can serve as a tool for rapid assessment and sensitivity analysis of carbon balance at the regional level, as well as a basis for educational purposes, provided that calibration data are available for a specific ecosystem type.

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