Premium
Rapid response of greenhouse gas emission to early spring thaw in a subarctic mire as shown by micrometeorological techniques
Author(s) -
Friborg T.,
Christensen T. R.,
Søgaard H.
Publication year - 1997
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/97gl03024
Subject(s) - mire , subarctic climate , environmental science , atmospheric sciences , methane , flux (metallurgy) , arctic , eddy covariance , atmosphere (unit) , greenhouse gas , growing season , climatology , peat , chemistry , ecosystem , meteorology , geology , oceanography , ecology , physics , organic chemistry , biology
Most studies of soil/atmosphere greenhouse gas exchange in Arctic and Sub‐Arctic wetlands have been conducted by the use of small scale chamber techniques during the growing season. To improve the knowledge about the processes in the transition period from winter to growth season, an experiment is presented here showing measurements of CH 4 , CO 2 and H 2 O using both chambers (only CH 4 ) and eddy correlation technique from the thaw period in early spring and during mid summer. The emphasis is on a comparison between eddy correlation and chamber measurements of methane fluxes during spring thawing in a subarctic mire near Abisko, northern Sweden. Methane exchange as measured by the two techniques is compared and evaluated in relation to temperature variations and atmospheric conductance. During the thaw period, integrated daily net fluxes of CH 4 flux showed emission rates increasing from 2.6 mg m −2 d −1 to 22.5 mg m −2 d −1 within four days; the later rate corresponding to approximately 25% of the mid‐summer flux. A profound diurnal cycle was observed in the release of methane, emphasising the importance of continuous measurements when calculating integrated fluxes.