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[B-4.1 Field Measurement of Methane and its Flux from the Siberian Permafrost]

[Contact Person]

Gen Inoue
Chief, Global Warming Mechanism Research Team
Division of Global Environment Research
National Institute for Environment Studies
16-2 Onogawa, Tsukuba, Ibaraki 305 Japan
Phone +81-298-51-6111(Ext.461 or 352)
E-mail inouegen@nies.go.jp

[Total Budget for FY1991-1993]

43,088,000 Yen (FY 1993 15,787,000 Yen)

[Abstract]

　The estimation of methane emission from natural wetland is quite rough, and one of the main uncertainty is due to the luck of field measurement of methane flux in Siberia which has the largest wetland in the world. More important is the estimation of feed-back effect to the methane emission rate due to the climate change: Methane emission will increase as the result of spread of wetland due to the melting of permafrost originating from the outstanding temperature increase in high latitude.
　The methane flux has been measured on an observation airplane over the center of East Siberian Lowland as a joint research project with Central Aerological Observatory, Russia, in summer, 1992. The flux has been calculated by the aerodynamic method, 0.5-0.15 g/m²/day as an instantaneous value, and by the temperature inversion trap method to be 0.25-0.05 g/m²/day at night time as average value. This is an averaged flux over wetland, containing lakes, marshes, forests, etc., the flux from which are quite different depending on places. The averaged value seems to be more useful to estimate the total flux from natural wetland than the method to accumulate from individual ground-base measurement.

[Key Words]

CH₄, Global Warming, Siberia, Emission Rate, Wetland