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- W2020341475 abstract "This is the first attempt to budget average current annual carbon (C) and associated greenhouse gas (GHG) exchanges and transfers in a subarctic landscape, the Lake Torneträsk catchment in northern Sweden. This is a heterogeneous area consisting of almost 4000 km 2 of mixed heath, birch and pine forest, and mires, lakes and alpine ecosystems. The magnitudes of atmospheric exchange of carbon in the form of the GHGs, CO 2 and CH 4 in these various ecosystems differ significantly, ranging from little or no flux in barren ecosystems over a small CO 2 sink function and low rates of CH 4 exchange in the heaths to significant CO 2 uptake in the forests and also large emissions of CH 4 from the mires and small lakes. The overall catchment budget, given the size distribution of the individual ecosystem types and a first approximation of run-off as dissolved organic carbon, reveals a landscape currently with a significant sink capacity for atmospheric CO 2 . This sink capacity is, however, extremely sensitive to environmental changes, particularly those that affect the birch forest ecosystem. Climatic drying or wetting and episodic events such as insect outbreaks may cause significant changes in the sink function. Changes in the sources of CH 4 through increased permafrost melting may also easily change the sign of the current radiative forcing, due to the stronger impact per gram of CH 4 relative to CO 2 . Hence, to access impacts on climate, the atmospheric C balance alone has to be weighed in a radiative forcing perspective. When considering the emissions of CH 4 from the mires and lakes as CO 2 equivalents, the Torneträsk catchment is currently a smaller sink of radiative forcing, but it can still be estimated as representing the equivalent of approximately 14 000 average Swedish inhabitants' emissions of CO 2 . This can be compared with the carbon emissions of less than 200 people who live permanently in the catchment, although this comparison disregards substantial emissions from the non-Swedish tourism and transportation activities." @default.
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- W2020341475 date "2007-05-18" @default.
- W2020341475 modified "2023-09-26" @default.
- W2020341475 title "A catchment-scale carbon and greenhouse gas budget of a subarctic landscape" @default.
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- W2020341475 doi "https://doi.org/10.1098/rsta.2007.2035" @default.
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