Modelling methane emissions from natural wetlands by development and application of the TRIPLEX-GHG model

摘要

A new process-based model TRIPLEX-GHG was developed based on the IntegratedBiosphere Simulator (IBIS), coupled with a new methane (CH₄)biogeochemistry module (incorporating CH₄ production, oxidation, andtransportation processes) and a water table module to investigate CH₄emission processes and dynamics that occur in natural wetlands. Sensitivityanalysis indicates that the most sensitive parameters to evaluate CH₄emission processes from wetlands are r (defined as the CH₄ to CO₂release ratio) and Q₁₀ in the CH₄ production process. These twoparameters were subsequently calibrated to data obtained from 19 sitescollected from approximately 35 studies across different wetlands globally.Being heterogeneously spatially distributed, r ranged from 0.1 to 0.7 with amean value of 0.23, and the Q₁₀ for CH₄ production ranged from 1.6to 4.5 with a mean value of 2.48. The model performed well when simulatingmagnitude and capturing temporal patterns in CH₄ emissions from naturalwetlands. Results suggest that the model is able to be applied to differentwetlands under varying conditions and is also applicable for global-scalesimulations.