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[B-4.2 Field Measurement of Seasonal Change of CO₂ and its Annual Balance]

[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]

24,938,000 Yen (FY1993 14,013,000 Yen)

[Abstract]

　One of the most important subject of research concerning the global climate change is so called "missing sink of CO₂". The annual variation of CO₂ and its stable isotope concentration suggests that boreal forest may be one of the most important missing sink of CO₂.
　The long term measurement of CO₂ concentration in Taiga area, Yakutsk, in East Siberia has been started. Self-support type CO₂ instrument, which consists of Ni-converter FID-GC, nitrogen carrier gas generator, hydrogen generator, hydrocarbon free air generator and some meteorological instruments, has been installed in a container laboratory. The sampling of air from 77, 44, and 11m in height will give us the information about the interaction between the atmosphere and the forest in Siberia.
　Some large scale CO₂ observations have been performed by an observation aircraft over Siberia. The diurnal variation of vertical distribution of CO₂ suggest that the boundary layer is strongly influenced by the vegetation. Measurement of CO₂ concentration change in the temperature inversion and in the mixing layer combined with the analysis of mixing dynamics will lead us to a better understanding of this interaction.

[Key Words]

CO₂, Global Warming, Taiga, Carbon Cycle