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Titel |
Sensitivity analysis of a wetland methane emission model based on temperate and arctic wetland sites |
VerfasserIn |
J. Huissteden, A. M. R. Petrescu, D. M. D. Hendriks, K. T. Rebel |
Medientyp |
Artikel
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Sprache |
Englisch
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ISSN |
1726-4170
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Digitales Dokument |
URL |
Erschienen |
In: Biogeosciences ; 6, no. 12 ; Nr. 6, no. 12 (2009-12-16), S.3035-3051 |
Datensatznummer |
250004229
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Publikation (Nr.) |
copernicus.org/bg-6-3035-2009.pdf |
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Zusammenfassung |
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 avarage, 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. |
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