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GEOPHYSICAL RESEARCH LETTERS, VOL. 30, NO. 21, 2129, doi:10.1029/2003GL017797, 2003

Siberian wetlands: Where a sink is a source

Thomas Friborg

Institute of Geography, Univ. of Copenhagen, Denmark


Henrik Soegaard

Institute of Geography, Univ. of Copenhagen, Denmark


Torben R. Christensen

Department of Physical Geography and Ecosystem Analysis, Lund Univ., Sweden


Colin R. Lloyd

Centre for Ecology and Hydrology, Wallingford, UK


Nicolai S. Panikov

Department of Chemistry and Chemical Biology, Stevens Institute of Technology, USA


Abstract

A greenhouse gas inventory can for some ecosystems be based solely on the net CO2 exchange with the atmosphere and the export of dissolved organic carbon. In contrast, the global warming effect may be more complex in ecosystems where other greenhouse gases such as CH4 or N2O have significant exchanges with the atmosphere. Through micrometeorological landscape-scale measurements from the largest wetlands on Earth in West Siberia we show that CH4 has a stronger effect than CO2 on the greenhouse gas budget in terms of radiative forcing on the atmosphere. Direct measurements of the CO2 and CH4 exchange during the summer of 1999 show that these wetland ecosystems, on average, acted as net sinks of carbon of 0.5 g C m−2 day−1 but large net sources of CH4. Given the high Global Warming Potential of CH4, the Siberian wetlands are an important source of radiative forcing, even in comparison to anthropogenic emissions.

Received 22 May 2003; accepted 2 September 2003; published 15 November 2003.

Index Terms: 1600 Global Change; 1615 Global Change: Biogeochemical processes (4805); 3322 Meteorology and Atmospheric Dynamics: Land/atmosphere interactions; 0315 Atmospheric Composition and Structure: Biosphere/atmosphere interactions.

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Citation: Friborg, T., H. Soegaard, T. R. Christensen, C. R. Lloyd, and N. S. Panikov (2003), Siberian wetlands: Where a sink is a source, Geophys. Res. Lett., 30(21), 2129, doi:10.1029/2003GL017797.