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  Modeling micro-topographic controls on boreal peatland hydrology and methane fluxes

Cresto-Aleina, F., Runkle, B., Kleinen, T., Kutzbach, L., Schneider, J., & Brovkin, V. (2015). Modeling micro-topographic controls on boreal peatland hydrology and methane fluxes. Biogeosciences, 12, 5689-5704. doi:10.5194/bg-12-5689-2015.

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bg-12-5689-2015.pdf (Verlagsversion), 693KB
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Final Revised Paper
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 Urheber:
Cresto-Aleina, Fabio1, 2, Autor           
Runkle, B.R.K., Autor
Kleinen, Thomas1, Autor                 
Kutzbach, L., Autor
Schneider, J., Autor
Brovkin, Victor1, Autor                 
Affiliations:
1Climate-Biogeosphere Interaction, The Land in the Earth System, MPI for Meteorology, Max Planck Society, ou_913566              
2MPI for Biogeochemistry, ou_persistent22              

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 Zusammenfassung: Small-scale surface heterogeneities can influence land-atmosphere fluxes and therefore carbon, water and energy budgets on a 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 the 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 the 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. © 2015 Author(s).

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Sprache(n): eng - English
 Datum: 20152015-10-08
 Publikationsstatus: Erschienen
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 Ort, Verlag, Ausgabe: -
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 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.5194/bg-12-5689-2015
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Titel: Biogeosciences
  Andere : Biogeosciences
Genre der Quelle: Zeitschrift
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Affiliations:
Ort, Verlag, Ausgabe: Katlenburg-Lindau, Germany : Copernicus GmbH on behalf of the European Geosciences Union
Seiten: - Band / Heft: 12 Artikelnummer: - Start- / Endseite: 5689 - 5704 Identifikator: ISSN: 1726-4170
CoNE: https://pure.mpg.de/cone/journals/resource/111087929276006