The importance of process interactions and parameter sensitivity for modelling the carbon dynamics in a natural peatland

Autor: Matthias Peichl, Christine Metzger, Per-Erik Jansson, Mats Nilsson
Rok vydání: 2016
Předmět:
Popis: In contrast to previous peatland carbon dioxide (CO2) model sensitivity analyses, usually focusing on only one or few modules, this study investigates interactions between various biotic and abiotic processes and their parameters by comparing CoupModel results with multiple observation variables. Many interactions were found not only within, but also between the various model modules. Each measurement variable was sensitive to up to ten (out of 54) parameters, from up to seven different processes. The constrained parameter ranges varied, depending on the variable and performance index chosen as criteria, and on other calibrated parameters (equifinalities). Therefore, transferring parameter ranges between models needs to be done with caution, especially if such ranges were achieved by considering only few processes. The identified interactions and constrained parameters will be of high interest to use for comparisons with model results and data from similar ecosystems. All of the available measurement variables (net ecosystem exchange, leaf area index, sensible and latent heat fluxes, net radiation, soil temperatures, water table depth and snow depth) improved model constraint. Additional measurements of soil hydraulic properties or water content would reduce equifinalities and constrain additional parameters that showed high range of uncertainty. The presented results can help modellers and experimentalists to design model calibrations and experimental setups on peatlands.
Databáze: OpenAIRE
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