Title Sensitivity analysis of a wetland methane emission model based on temperate and arctic wetland sites
Author van Huissteden, J.; Petrescu, A.M.R.; Hendriks, D.M.D.; Rebel, K.T.
Author Affil van Huissteden, J., Vrije Universiteit Amsterdam, Faculty of Earth and Life Sciences, Hydrology and Geo- environmental Sciences Group, Amsterdam, Netherlands. Other: Deltares, Netherlands; Universiteit Utrecht, Netherlands
Source Biogeosciences, 6(12), p.3035-3051, . Publisher: Copernicus GmbH on behalf of the European Union, Katlenburg-Lindau, International. ISSN: 1726- 4170
Publication Date 2009
Notes In English. Published in Biogeosciences Discussions: 17 September 2009, http://www.biogeosciences- discuss.net/6/9083/2009/bgd-6-9083-2009.html; accessed in March, 2011; abstract: doi: 10.5194/bg-6-3035-2009. 43 refs. GeoRef Acc. No: 310491
Index Terms climatic change; ground water; hydrocarbons; porosity; soils; soil temperature; statistical analysis; temperature; tundra; vegetation; water table; wetlands; Netherlands--Horstermeer; Netherlands--Ruwiel; Asia--Siberia; Netherlands--Utrecht; aliphatic hydrocarbons; alkanes; anaerobic environment; arctic environment; Asia; atmospheric transport; carbon dioxide; climate change; Europe; greenhouse gases; Horstermeer Netherlands; Kytalyk Russia; methane; Monte Carlo analysis; Netherlands; numerical models; organic compounds; PEATLAND-VU; Ruwiel Netherlands; sensitivity analysis; Siberia; soil gases; spatial variations; temperate environment; temporal distribution; transport; uncertainty; Utrecht Netherlands; Western Europe
Abstract Modelling of wetland CH4 fluxes using wetland soil emission models is used to determine the size of this natural source of CH4 emission on local to global scale. Most process models of CH4 formation and soil- atmosphere CH4 transport processes operate on a plot scale. For large scale emission modelling (regional to global scale) upscaling of this type of model requires thorough analysis of the sensitivity of these models to parameter uncertainty. We applied the GLUE (Generalized Likelihood Uncertainty Analysis) methodology to a well-known CH4 emission model, the Walter-Heimann model, as implemented in the PEATLAND-VU model. The model is tested using data from two temperate wetland sites and one arctic site. The tests include experiments with different objective functions, which quantify the fit of the model results to the data. The results indicate that the model 1) in most cases is capable of estimating CH4 fluxes better than an estimate based on the data average, but does not clearly outcompete a regression model based on local data; 2) is capable of reproducing larger scale (seasonal) temporal variability in the data, but not the small- scale (daily) temporal variability; 3) is not strongly sensitive to soil parameters, 4) is sensitive to parameters determining CH4 transport and oxidation in vegetation, and the temperature sensitivity of the microbial population. The GLUE method also allowed testing of several smaller modifications of the original model. We conclude that upscaling of this plot-based wetland CH4 emission model is feasible, but considerable improvements of wetland CH4 modelling will result from improvement of wetland vegetation data.
URL http://www.biogeosciences.net/6/3035/2009/bg-6-3035-2009.pdf
Publication Type journal article
Record ID 65007110