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Moist moss tundra on Kapp Linne, Svalbard is a net source of CO2 and CH4 to the atmosphere
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  • Anders Lindroth,
  • Norbert Pirk,
  • Ingibjörg S Jónsdóttir,
  • Christian Stiegler,
  • Leif Klemedtsson,
  • Mats B. Nilsson
Anders Lindroth
Lund University

Corresponding Author:anders.lindroth@nateko.lu.se

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Norbert Pirk
Department of Geosciences, University of Oslo
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Ingibjörg S Jónsdóttir
Life and Environmental Sciences, University of Iceland
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Christian Stiegler
University of Göttingen
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Leif Klemedtsson
Goeteborg University, Sweden
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Mats B. Nilsson
Swedish University of Agricultural Sciences
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We measured COs-1 which corresponds to a growing season estimate of 0.04 to 0.16 g CH4 m-2. We find that this moss tundra emits about 60 gCO2-equivalents m-2 yr-1 of which CH4 is responsible for 7%. Air temperature, soil moisture and greenness index contributed significantly to explain the variation in ecosystem respiration (Reco) while active layer depth, soil moisture and greenness index best explained CH4 emissions. Estimate of temperature sensitivity of Reco and gross primary productivity showed that a modest increase in air temperature of 1 degree did not significantly change the NEE during the growing season but that the annual NEE would be even more positive adding another 8.5 gC m-2 to the atmosphere. We tentatively suggest that the warming of the Arctic that has already taken place is partly responsible for the fact that the moist moss tundra now is a source of CO2 to the atmosphere.