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| Titel |
Modelling Holocene carbon accumulation and methane emissions of boreal wetlands – an Earth system model approach |
| VerfasserIn |
R. J. Schuldt, V. Brovkin, T. Kleinen, J. Winderlich |
| 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 ; 10, no. 3 ; Nr. 10, no. 3 (2013-03-12), S.1659-1674 |
| Datensatznummer |
250018147
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| Publikation (Nr.) |
 copernicus.org/bg-10-1659-2013.pdf |
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| Zusammenfassung |
| Since the Last Glacial Maximum, boreal wetlands have accumulated substantial
amounts of peat, estimated at 180–621 Pg of carbon. Wetlands have
significantly affected the atmospheric greenhouse gas composition in the
past and will play a significant role in future changes of atmospheric
CO2 and CH4 concentrations. In order to investigate those changes
with an Earth system model, biogeochemical processes in boreal wetlands need
to be accounted for. Thus, a model of peat accumulation and decay was
developed and included in the land surface model JSBACH of the Max Planck
Institute Earth System Model (MPI-ESM). Here we present the evaluation of
model results from 6000 yr BP to the pre-industrial period. Over this
period of time, 240 Pg of peat carbon accumulated in the model in the areas
north of 40° N. Simulated peat accumulation rates agree well with
those reported for boreal wetlands. The model simulates CH4 emissions
of 49.3 Tg CH4 yr−1 for 6000 yr BP and 51.5 Tg CH4 yr−1 for pre-industrial times. This is within the range of estimates in
the literature, which range from 32 to 112 Tg CH4 yr−1 for boreal
wetlands. The modelled methane emission for the West Siberian Lowlands and Hudson
Bay Lowlands agree well with observations. The rising trend of methane
emissions over the last 6000 yr is in agreement with measurements of
Antarctic and Greenland ice cores. |
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