HR: 1340h
AN: B53A-0923    [Abstracts]
TI: Intensive studies on trace gas emission from a subarctic Swedish peatland.
AU: * Korczynski, M J
EM: Marcin.Jackowicz-Korczynski@nateko.lu.se
AF: Department of Physical Geography and Ecosystems Analysis, Lund University, Sölvegatan 12, Lund, 22362, Sweden
AU: Christensen, T R
EM: Torben.Christensen@nateko.lu.se
AF: Department of Physical Geography and Ecosystems Analysis, Lund University, Sölvegatan 12, Lund, 22362, Sweden
AU: Crill, P
EM: Patrick.Crill@geo.su.se
AF: Department of Geology and Geochemistry, Stockholm University, Svante Arrhenius väg 8 C, Stockholm, 10691, Sweden
AU: Friborg, T
EM: tfj@geogr.ku.dk
AF: Institute of Geography, University of Copenhagen, Øster Voldgade 10, Copenhagen, 1350, Denmark
AU: Ström, L
EM: Lena.Strom@nateko.lu.se
AF: Department of Physical Geography and Ecosystems Analysis, Lund University, Sölvegatan 12, Lund, 22362, Sweden
AB: Subarctic peatlands are one of the most sensitive ecosystems which react in a direct way to climate warming. Already now we can observe how formations underlain by permafrost are rapidly disintegrating and changing into a wetter hydrological state. These changes have triggered visible and substantial changes in the vegetation distribution and may represent an important feedback mechanism in changing climate through changes in the land-atmosphere exchanges of trace gases such as carbon dioxide (CO₂) and methane (CH₄).
Within this study intensive and detailed flux measurements of both CH₄ and CO₂ were conducted during 2006 and 2007 over Stordalen mire, northernmost part of sub-Arctic Sweden (68° 20' N, 19° 03' E, alt. 351 m). Measurements were conducted with the use of two different techniques, automatic chambers and eddy correlation using a tunable diode laser. Landscape scale fluxes were documented by the eddy correlation system to be rather high, averaging 9 mg m^-2 hr^-1 during the peak season and these fluxes corresponded well with automatic chamber measurements in the wet minerotrophic parts of the peatland. It is the latter vegetation type that is expanding as the permafrost is melting. Apart detailed comparison between the results obtained with both techniques a full annual budget for the exchanges of radiative active trace gases between this mire and the atmosphere will be presented.
DE: 0426 Biosphere/atmosphere interactions (0315)
DE: 0428 Carbon cycling (4806)
DE: 0438 Diel, seasonal, and annual cycles (4227)
DE: 0475 Permafrost, cryosphere, and high-latitude processes (0702, 0716)
SC: Biogeosciences [B]
MN: 2007 Fall Meeting