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| Titel |
Carbon budget estimation of a subarctic catchment using a dynamic ecosystem model at high spatial resolution |
| VerfasserIn |
J. Tang, P. A. Miller, A. Persson, D. Olefeldt, P. Pilesjö, M. Heliasz, M. Jackowicz-Korczyñski, Z. Yang, B. Smith, T. V. Callaghan, T. R. Christensen |
| 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 ; 12, no. 9 ; Nr. 12, no. 9 (2015-05-12), S.2791-2808 |
| Datensatznummer |
250117931
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| Publikation (Nr.) |
 copernicus.org/bg-12-2791-2015.pdf |
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| Zusammenfassung |
| A large amount of organic carbon is stored in high-latitude soils. A
substantial proportion of this carbon stock is vulnerable and may decompose
rapidly due to temperature increases that are already greater than the
global average. It is therefore crucial to quantify and understand carbon
exchange between the atmosphere and subarctic/arctic ecosystems. In this
paper, we combine an Arctic-enabled version of the process-based dynamic
ecosystem model, LPJ-GUESS (version LPJG-WHyMe-TFM) with comprehensive
observations of terrestrial and aquatic carbon fluxes to simulate long-term
carbon exchange in a subarctic catchment at 50 m resolution. Integrating the
observed carbon fluxes from aquatic systems with the modeled terrestrial
carbon fluxes across the whole catchment, we estimate that the area is a
carbon sink at present and will become an even stronger carbon sink by
2080, which is mainly a result of a projected densification of birch forest
and its encroachment into tundra heath. However, the magnitudes of the
modeled sinks are very dependent on future atmospheric CO2
concentrations. Furthermore, comparisons of global warming potentials
between two simulations with and without CO2 increase since 1960 reveal
that the increased methane emission from the peatland could double the
warming effects of the whole catchment by 2080 in the absence of CO2
fertilization of the vegetation. This is the first process-based model study
of the temporal evolution of a catchment-level carbon budget at high spatial
resolution, including both terrestrial and aquatic carbon. Though this study
also highlights some limitations in modeling subarctic ecosystem responses
to climate change, such as aquatic system flux dynamics, nutrient
limitation, herbivory and other disturbances, and peatland expansion, our
study provides one process-based approach to resolve the complexity of
carbon cycling in subarctic ecosystems while simultaneously pointing out the
key model developments for capturing complex subarctic processes. |
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