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

Qing Zhu·Jinxun Liu·C. Peng·H. Chen·X. Fang·H. Jiang·G. Yang·D. Zhu·W. Wang·X. Zhou
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Abstract

A new process-based model TRIPLEX-GHG was developed based on the Integrated Biosphere Simulator (IBIS), coupled with a new methane (CH 4 ) biogeochemistry module (incorporating CH 4 production, oxidation, and transportation processes) and a water table module to investigate CH 4 emission processes and dynamics that occur in natural wetlands. Sensitivity analysis indicates that the most sensitive parameters to evaluate CH 4 emission processes from wetlands are r (defined as the CH 4 to CO 2 release ratio) and Q 10 in the CH 4 production process. These two parameters were subsequently calibrated to data obtained from 19 sites collected from approximately 35 studies across different wetlands globally. Being heterogeneously spatially distributed, r ranged from 0.1 to 0.7 with a mean value of 0.23, and the Q 10 for CH 4 production ranged from 1.6 to 4.5 with a mean value of 2.48. The model performed well when simulating magnitude and capturing temporal patterns in CH 4 emissions from natural wetlands. Results suggest that the model is able to be applied to different wetlands under varying conditions and is also applicable for global-scale simulations.

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Qing Zhu, Jinxun Liu, C. Peng, H. Chen, X. Fang, H. Jiang, G. Yang, D. Zhu, W. Wang, X. Zhou. 2014-05-26. Modelling methane emissions from natural wetlands by development and application of the TRIPLEX-GHG model. https://doi.org/10.5194/gmd-7-981-2014

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