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[B-4.1.1 Total Methane Emission Rate from Natural Wetland in Siberia]

[Contact Person]

Gen Inoue
Principal Research Scientist
Atmospheric Division and Global Environment Division,
National Institute for Environment Studies, Environment Agency Japan,
16-2 Onogawa, Tsukuba, Ibaraki 305, JAPAN
Phone +81-298-50-2402, Fax +81-298-50-2468
E-mail inouegen@nies.go.jp

[Total Budget for FY1994-1996]

40,786,000 Yen (FY1996 13,366,000 Yen)

[Abstract]

　The methane emission inventory is widely spread among natural and anthropogenic sources. The strength of natural source is not well evaluated because the emission rate per unit area is small but the area of wetland is so huge to measure it everywhere. It is very variable by environmental conditions such as precipitation and temperature both in time and places. There is a biggest wetland in West Siberia and it is expected to be a large methane source, but little is known and it is important to do the measurement to reduce the uncertainly of global emission.
　One of the method is to evaluate the methane emission by the aircraft measurement. In this measurement, an anthropogenic emission which should be ascribed to the leakage from oil mining was observed.
　The methane emission was measured on the ground by a so called chamber method in a period of two month and positive dependence on the ground temperature was obtained. The gradient of emission strength decreasing in the direction from the wetland to the dry forest area was observed as well as the vegetation dependence.
　The eddy correlation method was applied by conditional sampling method to evaluate the methane emission in patch scale, but it was less successful.

[Key Words]

Methane, Methane Flux, Natural Wetland, Siberia