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[B-4.4 Emission of Trace Gases from the Melting Permafrost in Tundra area of Siberia]

[Contact Person]

Gen Inoue
Chief, Global Warming Mechanism Research Team
Division of Global Environment Research
National Institute for Environment Studies
2-16 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]

25,681,000 Yen (FY 1993 13,006,000 Yen)

[Abstract]

　Permafrost area accounts for 20-30% of total land area, and so called ice-complex have been found to contain bubbles with high methane concentration(0.3-0.02%). The origin of methane in it has been found to be biogenic in warmer climate age. This methane is released as the result of global warming, but it is expected to be oxidized in the active layer if there exist above, which is the case in most of the area. However, at a cliff or through a fissure, it is released into the air directly.
　Methane emission rate has been compared between Tundra and Taiga area. Methane emission from wetland in tundra was 20-80mg/m²/day during August, 1993. The emission rate at different alas scattered in the range 2000-10mg/m²/day depending on its type and places in it.


*This report was summarized by G. Inoue from the reports by DR. Fukuda et. al. and by Ms.Nakayama et. al. Institute of Low Temperature Science, Hokkaido University, and Dr. Nojiri et.al., NIES.

[Key Words]

Siberia, Tundra, Permafrost, CH₄, Emission Rate