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Annual carbon gas budget for a subarctic peatland, Northern Sweden

Backstrand, K.; Crill, P. M.; Jackowicz-Korczynski, Marcin LU ; Mastepanov, Mikhail LU ; Christensen, T. R. and Bastviken, D. (2010) In Biogeosciences 7(1). p.95-108
Abstract
Temperatures in the Arctic regions are rising, thawing permafrost and exposing previously stable soil organic carbon (OC) to decomposition. This can result in northern latitude soils, which have accumulated large amounts of OC potentially shifting from atmospheric C sinks to C sources with positive feedback on climate warming. In this paper, we estimate the annual net C gas balance (NCB) of the subarctic mire Stordalen, based on automatic chamber measurements of CO2 and total hydrocarbon (THC; CH4 and NMVOCs) exchange. We studied the dominant vegetation communities with different moisture and permafrost characteristics; a dry Palsa underlain by permafrost, an intermediate thaw site with Sphagnum spp. and a wet site with Eriophorum spp.... (More)
Temperatures in the Arctic regions are rising, thawing permafrost and exposing previously stable soil organic carbon (OC) to decomposition. This can result in northern latitude soils, which have accumulated large amounts of OC potentially shifting from atmospheric C sinks to C sources with positive feedback on climate warming. In this paper, we estimate the annual net C gas balance (NCB) of the subarctic mire Stordalen, based on automatic chamber measurements of CO2 and total hydrocarbon (THC; CH4 and NMVOCs) exchange. We studied the dominant vegetation communities with different moisture and permafrost characteristics; a dry Palsa underlain by permafrost, an intermediate thaw site with Sphagnum spp. and a wet site with Eriophorum spp. where the soil thaws completely. Whole year accumulated fluxes of CO2 were estimated to 29.7, -35.3 and -34.9 gC m(-2) respectively for the Palsa, Sphagnum and Eriophorum sites (positive flux indicates an addition of C to the atmospheric pool). The corresponding annual THC emissions were 0.5, 6.2 and 31.8 gC m(-2) for the same sites. Therefore, the NCB for each of the sites was 30.2, -29.1 and -3.1 gC m(-2) respectively for the Palsa, Sphagnum and Eriophorum site. On average, the whole mire was a CO2 sink of 2.6 gC m(-2) and a THC source of 6.4 gC m(-2) over a year. Consequently, the mire was a net source of C to the atmosphere by 3.9 gC m(-2) (based on area weighted estimates for each of the three plant communities). Early and late snow season efflux of CO2 and THC emphasize the importance of winter measurements for complete annual C budgets. Decadal vegetation changes at Stordalen indicate that both the productivity and the THC emissions increased between 1970 and 2000. Considering the GWP(100) of CH4, the net radiative forcing on climate increased 21% over the same time. In conclusion, reduced C compounds in these environments have high importance for both the annual C balance and climate. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Biogeosciences
volume
7
issue
1
pages
95 - 108
publisher
Copernicus Publications
external identifiers
  • wos:000274058100008
  • scopus:75749098140
ISSN
1726-4189
language
English
LU publication?
yes
id
a39c49dc-d715-4434-8ce7-729ea2f27861 (old id 1571167)
date added to LUP
2010-03-16 14:49:19
date last changed
2018-07-15 03:13:05
@article{a39c49dc-d715-4434-8ce7-729ea2f27861,
  abstract     = {Temperatures in the Arctic regions are rising, thawing permafrost and exposing previously stable soil organic carbon (OC) to decomposition. This can result in northern latitude soils, which have accumulated large amounts of OC potentially shifting from atmospheric C sinks to C sources with positive feedback on climate warming. In this paper, we estimate the annual net C gas balance (NCB) of the subarctic mire Stordalen, based on automatic chamber measurements of CO2 and total hydrocarbon (THC; CH4 and NMVOCs) exchange. We studied the dominant vegetation communities with different moisture and permafrost characteristics; a dry Palsa underlain by permafrost, an intermediate thaw site with Sphagnum spp. and a wet site with Eriophorum spp. where the soil thaws completely. Whole year accumulated fluxes of CO2 were estimated to 29.7, -35.3 and -34.9 gC m(-2) respectively for the Palsa, Sphagnum and Eriophorum sites (positive flux indicates an addition of C to the atmospheric pool). The corresponding annual THC emissions were 0.5, 6.2 and 31.8 gC m(-2) for the same sites. Therefore, the NCB for each of the sites was 30.2, -29.1 and -3.1 gC m(-2) respectively for the Palsa, Sphagnum and Eriophorum site. On average, the whole mire was a CO2 sink of 2.6 gC m(-2) and a THC source of 6.4 gC m(-2) over a year. Consequently, the mire was a net source of C to the atmosphere by 3.9 gC m(-2) (based on area weighted estimates for each of the three plant communities). Early and late snow season efflux of CO2 and THC emphasize the importance of winter measurements for complete annual C budgets. Decadal vegetation changes at Stordalen indicate that both the productivity and the THC emissions increased between 1970 and 2000. Considering the GWP(100) of CH4, the net radiative forcing on climate increased 21% over the same time. In conclusion, reduced C compounds in these environments have high importance for both the annual C balance and climate.},
  author       = {Backstrand, K. and Crill, P. M. and Jackowicz-Korczynski, Marcin and Mastepanov, Mikhail and Christensen, T. R. and Bastviken, D.},
  issn         = {1726-4189},
  language     = {eng},
  number       = {1},
  pages        = {95--108},
  publisher    = {Copernicus Publications},
  series       = {Biogeosciences},
  title        = {Annual carbon gas budget for a subarctic peatland, Northern Sweden},
  volume       = {7},
  year         = {2010},
}