HR: 1340h
AN: B23A-0956    [Abstracts]
TI: The Yearly Carbon Balance of a Low-Arctic Wetland.
AU: * Friborg, T
EM: tfj@geogr.ku.dk
AF: Inst. Of Geography, University of Copenhagen, Oester Voldgade 10, Copenhagen, 1350 Denmark
AU: Christensen, T R
EM: Torben.Christensen@nateko.lu.se
AF: Department of Physical Geography and Ecosystems Analysis, Lund University, Solvegatan 12, Lund, 223 62 Sweden
AU: Johansson, T
EM: Torbjorn.Johansson@nateko.lu.se
AF: Department of Physical Geography and Ecosystems Analysis, Lund University, Solvegatan 12, Lund, 223 62 Sweden
AU: Mastepanov, M
EM: Mikhail.Mastepanov@nateko.lu.se
AF: Department of Physical Geography and Ecosystems Analysis, Lund University, Solvegatan 12, Lund, 223 62 Sweden
AB: Changes in the high latitude carbon pools have been an important topic in the climatic change debate over the last decades, due to the large amounts of carbon stored in especially wetland ecosystems of the region. The predicted temperature rise in most parts of the high latitudes is likely to have effect on both ecosystems and the atmospheric concentration of especially CO2 and methane. Over the last four years continuous measurements of the CO2 exchange have been carried out over the Stordalen mire in the Sub-Arctic region of Sweden, where the permafrost in wetlands is on a rapid retreat. Our measurements show a small annual uptake of CO2 (10-30 g C m-2 y-1) and a corresponding emission of CH4 in the order of 5 g C m-2 y-1, which makes this mire site a small net sink of carbon but a likely source of greenhouse gas to the atmosphere. Here we describe the inter-annual variations and the functional relationship between the exchange of the two gases and prevailing climatic conditions of the area.
DE: 4806 Carbon cycling
DE: 1600 GLOBAL CHANGE (New category)
DE: 1615 Biogeochemical processes (4805)
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting