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Modeling micro-topographic controls on boreal peatland hydrology and methane fluxes
| Content Provider | Scilit |
|---|---|
| Author | Aleina, F. Cresto Runkle, B. R. K. Kleinen, T. Kutzbach, L. Schneider, J. Brovkin, V. |
| Copyright Year | 2015 |
| Description | Small-scale surface heterogeneities can influence land–atmosphere fluxes and therefore carbon, water and energy budgets on larger scale. This effect is of particular relevance for high-latitude ecosystems, because of the great amount of carbon stored in their soils. We introduce a novel micro-topographic model, the Hummock–Hollow (HH) model, which explicitly represents small-scale surface elevation changes. By computing the water table at the small scale, and by coupling the model with a process-based model for soil methane processes, we are able to model effects of micro-topography on hydrology and methane emissions in a typical boreal peatland. In order to assess the effect of micro-topography on water balance and methane emissions of the peatland we compare two versions of the model, one with a representation of micro-topography and a classical single-bucket model version, and show that the temporal variability in the model version with micro-topography performs better if compared with local data. Accounting for micro-topography almost triples the cumulative methane flux over the simulated time-slice. We found that the single-bucket model underestimates methane emissions because of its poor performance in representing hydrological dynamics. The HH model with micro-topography captures the spatial dynamics of water and methane fluxes, being able to identify the hotspots for methane emissions. The model also identifies a critical scale (0.01 km2) which marks the minimal resolution for the explicit representation of micro-topography in larger-scale models. |
| Ending Page | 5704 |
| Page Count | 16 |
| Starting Page | 5689 |
| DOI | 10.5194/bgd-12-10195-2015 |
| Alternate Webpage(s) | https://pure.mpg.de/pubman/item/item_2171547_4/component/file_2171545/BGC2283D.pdf |
| Issue Number | 19 |
| Volume Number | 12 |
| Language | English |
| Publisher | Copernicus GmbH |
| Publisher Date | 2015-07-08 |
| Access Restriction | Open |
| Subject Keyword | Boreal Peatland Modeling Micro Fluxes and Therefore Carbon |
| Content Type | Text |
| Resource Type | Article |
