HR: 1340h
AN: B53A-0921    [Abstracts]
TI: Patterns in methane emissions from arctic tundra: a comparison of chamber measurements over six growing seasons
AU: * Mastepanov, M
EM: Mikhail.Mastepanov@nateko.lu.se
AF: GeoBiosphere Science Centre, Physical Geography and Ecosystems Analysis, Lund University, Sölvegatan 12, 223 62, Lund, 22362, Sweden
AU: Christensen, T R
EM: Torben.Christensen@nateko.lu.se
AF: GeoBiosphere Science Centre, Physical Geography and Ecosystems Analysis, Lund University, Sölvegatan 12, 223 62, Lund, 22362, Sweden
AU: Ström, L
EM: Lena.Strom@nateko.lu.se
AF: GeoBiosphere Science Centre, Physical Geography and Ecosystems Analysis, Lund University, Sölvegatan 12, 223 62, Lund, 22362, Sweden
AU: Tagesson, T
EM: Torbern.Tagesson@nateko.lu.se
AF: GeoBiosphere Science Centre, Physical Geography and Ecosystems Analysis, Lund University, Sölvegatan 12, 223 62, Lund, 22362, Sweden
AU: Ekberg, A
EM: Anna.Ekberg@nateko.lu.se
AF: GeoBiosphere Science Centre, Physical Geography and Ecosystems Analysis, Lund University, Sölvegatan 12, 223 62, Lund, 22362, Sweden
AU: Sigsgaard, C
EM: Cs@geogr.ku.dk
AF: Department of Geography, University of Copenhagen, Oster Voldgade 10, Copenhagen, DK-1350, Denmark
AU: Tamstorf, M
EM: mpt@dmu.dk
AF: Department for Arctic Environment, National Environmental Research Institute, Frederiksborgvej 399, Roskilde, DK-4000, Denmark
AB: Wet tundra ecosystems are well-known to be a significant source for atmospheric methane. With the predicted stronger effect of global climate change on arctic terrestrial ecosystems compared to lower-latitude ecosystems, there is a special obligation to study the natural diversity and the range of possible feedback effects on global climate that could arise from Arctic tundra ecosystems. Here we compare direct measurements of CH₄ emissions from high arctic valley at Zackenberg, NE Greenland, studied by chamber techniques during summer seasons 1997, 1999-2000, and 2005-2007. The measurements were carried out at the same wetland site, nevertheless hydrology and plant composition of the site were found significantly changed between 2000 and 2005. First three years the measurements were provided by manual chamber technique using FID-GC as methane analyzer, in 2005 a permanent automatic chamber system with laser off-axis integrated-cavity output spectroscopy analyzer was installed instead. The study years had different climate patterns (temperature, water regime), and showed differences in seasonal CH₄ fluxes. In this presentation we will propose an effort to obtain a detailed analysis of interannual differences in temperature and water regimes with resulting differences in methane emissions.
DE: 0426 Biosphere/atmosphere interactions (0315)
DE: 0428 Carbon cycling (4806)
DE: 0497 Wetlands (1890)
DE: 1630 Impacts of global change (1225)
DE: 9315 Arctic region (0718, 4207)
SC: Biogeosciences [B]
MN: 2007 Fall Meeting