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| Titel |
Modelling CH4 emissions from arctic wetlands: effects of hydrological parameterization |
| VerfasserIn |
A. M. R. Petrescu, J. Huissteden, M. Jackowicz-Korczyñski, A. Yurova, T. R. Christensen, P. M. Crill, K. Bäckstrand, T. C. Maximov |
| 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 ; 5, no. 1 ; Nr. 5, no. 1 (2008-01-30), S.111-121 |
| Datensatznummer |
250002230
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| Publikation (Nr.) |
 copernicus.org/bg-5-111-2008.pdf |
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| Zusammenfassung |
This study compares the CH4 fluxes from two arctic
wetland sites of different annual temperatures during 2004 to 2006. The
PEATLAND-VU model was used to simulate the emissions. The CH4
module of PEATLAND-VU is based on the Walter-Heimann model. The first site
is located in northeast Siberia, Indigirka lowlands, Kytalyk reserve
(70° N, 147° E) in a continuous permafrost region
with mean annual temperatures of −14.3°C. The other site is
Stordalen mire in the eastern part of Lake Torneträsk
(68° N, 19° E) ten kilometres east of Abisko,
northern Sweden. It is located in a discontinuous permafrost region.
Stordalen has a sub arctic climate with a mean annual temperature of
−0.7°C. Model input consisted of observed temperature,
precipitation and snow cover data.
In all cases, modelled CH4 emissions show a direct
correlation between variations in water table and soil temperature
variations. The differences in CH4 emissions between the two
sites are caused by different climate, hydrology, soil physical properties,
vegetation type and NPP.
For Kytalyk the simulated CH4 fluxes show similar
trends during the growing season, having average values for 2004 to 2006
between 1.29–2.09 mg CH4 m−2 hr−1. At Stordalen the simulated fluxes show a slightly lower
average value for the same years (3.52 mg CH4 m−2 hr−1) than the
observed 4.7 mg CH4 m−2 hr−1. The effect of the
longer growing season at Stordalen is simulated correctly.
Our study shows that modelling of arctic CH4 fluxes is
improved by adding a relatively simple hydrological model that simulates the
water table position from generic weather data. Our results support the
generalization in literature that CH4 fluxes in northern
wetland are regulated more tightly by water table than temperature.
Furthermore, parameter uncertainty at site level in wetland
CH4 process models is an important factor in large scale
modelling of CH4 fluxes. |
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