The timing of snow melt controls the annual CO2 balance in a subarctic fen

Details The timing of snow melt controls the annual CO2 balance in a subarctic fen The timing of snow melt controls the annual CO2 balance in a subarctic fen

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3116119a&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 16, CiteID L16119

Mathematics

Logic

23

Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions, Atmospheric Composition And Structure: Constituent Sources And Sinks, Global Change: Atmosphere (0315, 0325), Global Change: Biogeochemical Processes (4805), Global Change: Instruments And Techniques

Scientific paper

The first continuous multi-year measurements of the CO2 exchange between a subarctic fen and the atmosphere were conducted at Kaamanen in northern Finland (69°N). According to our six-year data-set, the fen is presently a sink of atmospheric CO2 with a mean rate of -22 g C m-2 yr-1. The interannual variation of the CO2 balances originates almost completely from the variations during the snow-free period, but the efflux in the wintertime constitutes a significant part of the annual balance. The snow melt timing is the most important single determinant of the annual carbon balance. In contrast to a commonly-held view, the hydrometeorological conditions during the growing season had only a minor effect on the annual balance, emphasizing the importance of year-round measurements. This study indicates that climate warming may increase the length of the growing season and thus benefit rather than threaten the carbon pool of subarctic peatlands.

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