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Biogeochemical dynamics of carbon in the arctic tundra
Figure 1. Field measurements at Toolik Field Station
Biogeochemical cycle of carbon is an important concern since many disturbances are linked to human activities. Environments in high latitudes play an important role in the context of global changes. Indeed, soils represent about 4,000 Pg of carbon – i.e., half of terrestrial carbon – and 40% are stocked in the permafrost [1]. Arctic tundra is therefore an important central issue for carbon cycling.

Since September 2014, carbon dioxide (CO2) and methane (CH4) were continuously measured in the atmosphere, as well as in the gas phase of snow and soil, in Alaskan tundra (Toolik Field StationFigure 1). Preliminary results showed emissions for both CO2 and CH4 to the atmosphere throughout the seasons, probably due to a biological activity in the soil.
References 
[1] IPCC – Climate change 2013: the physical science basis. Cambridge University Press, Cambridge and New York, 1535 p. (2013)