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[B-5.2 Modeling of Material Transport in the Troposphere]

[Contact Person]

Masayasu Hayashi
Environmental Assessment Division
National Institute for Resources and Environment
Ministry of International Trade and Industry
Onogawa, 16-3, Tsukuba, Ibaraki,305 Japan
Tel:+81-298-58-8380, Fax+81-298-58-8358

[Total Budget for FY1994-1996]

36,187,000 Yen (FY1996 11,193,000 Yen)

[Abstract]

　A global chemical transport model is used to evaluate the emission and extinction of green house gases in the atmosphere. Tropospheric OH amount is revised using annual trend of methyl chloroform. Emission estimate for Methane is evaluated using latitude gradient of surface concentrations. Seasonal variations of CO₂ exchange of biosphere is examined using forward calculations and inversion methods. Tropospheric OH estimated by Spivakofsky is to be reduced 36% in NIRE-CTM The source estimate of Methane by Taylor has larger emission rate in the Southern Hemisphere. CO₂ exchange of biosphere by Fung starts uptake in growing season later than the correct time.

[Key Words]

Chemical transport model, OH radical, methane, carbon dioxide