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[B-1.1 Study on the Environmental Behavior of Greenhouse Gases of Industrial Origin]

[Contact Person]

Susumu Yamamoto
Chief of Division Environmental Assessment Dept.,
National Institute for Resources and Environment, AIST, MITI
Onogawa 16-3, Tsukuba, Ibaraki 305, Japan
Phone +81-298-58-8360, Fax +81-298-8358

[Total Budget for FY1990-1992]

93,765,000 Yen

[Abstract]

　In this study, the sources and sinks of CO₂ and CFCS are investigated and field observations to study the behavior of CO₂ were carried out over and around Japan. According to observational results, we get the value of 2 to 4 g/(m²hr) for intake rate of CO₂ due to the activity of vegetation under the daytime condition of lriomote Island of Okinawa and the value 1.5 to 2.5 g/(m²hr) under the daytime condition of Tsukuba in lbaraki. The values are roughly proportional to the amount of insolation. From the product of this value by whole area of the lriomote(20,000 ha), we can calculate that the total intake of CO₂ due to the vegetation in the lriomote is between 400 to 600 tons/hr. These values become about 1 g/(m²hr) under cloudy condition or in the evening. Emission rates of CO₂ in night are 0.3 to 0.4 g/(m²hr). However,we need to measure the net-intake of CO₂ during whole year for clarification of the role of vegetation.

[Key Words]

CO₂, Sources and Sinks, Exchange Process, Alrplane, Vegetation, Field Measurement