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Methane Flux From Arctic Tundras: It's The Hydrology, Stupid!

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  • npat1
    Fw: [CCG] update: methane flux ... Source: European Geosciences Union http://www.sciencedaily.com/releases/2006/04/060404200308.htm Posted: April 5, 2006
    Message 1 of 1 , Apr 6, 2006
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      Fw: [CCG] update: methane flux

      ---------- Forwarded Message ----------

      Source: European Geosciences Union
      http://www.sciencedaily.com/releases/2006/04/060404200308.htm
      Posted: April 5, 2006

      Methane Flux From Arctic Tundras: It's The Hydrology, Stupid!

      Many fear that, in the coming years, large amounts of methane will be
      released into the atmosphere. Methane is a much stronger greenhouse
      gas than carbon dioxide and global warming could lead to melting of
      the arctic tundras, setting free large volumes of methane, scientists
      have reported at the European Geosciences Union's General Assembly
      being held in Vienna, Austria. This would in its turn increase global
      warming.

      Methane fluxes from the arctic permafrost areas attract scientific
      attention because the release of this powerful greenhouse gas may act
      as a positive feedback to climate warming. Methane release,
      generally, is enhanced by increasing the metabolic activity of
      methane bacteria in warmer arctic soils, or by the release of methane
      from melting permafrost.

      However, research in the Northeast Siberian tundra has shown the
      importance of floodplain hydrology. The floodplains of arctic lowland
      rivers are major methane sources, where methane fluxes may be 5 times
      as high as in non-flooded tundra bogs. Moreover, these fluxes are
      very sensitive to river discharge fluctuations and the incidence of
      river floods. During a two year field campaign the drier year
      resulted in a 75% reduction of the methane flux. Currently, both air
      temperature and river discharges are rising significantly in the
      arctic.

      Oral Presentation: Ko Van Huissteden, Dolaman, A.J., Maximov, T.C.
      Floodplain hydrology and spatial/temporal variation of methane fluxes
      inarctic tundra, North East Siberia.

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