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[B-3 Precise Evaluation of the Greenhouse Efects of CH₄ and N₂O]

[Contact Person]

Senior Researcher, Kiyotaka Shibata
Climate Research Department, Meteorological Research Institute Meteorological Agency
Nagamine 1-1, Tsukuba, Ibaraki, 305, Japan
Tel +81-298-51-7111(Ext. 304), Fax +81-298-55-2552
E-mail kshibata@mri-1.mri-jma.go.jp

[Total Budget for FY1990-1992]

24,533,000 Yen

[Abstract]

　The greenhouse effect of Methane and Nitrous Oxide, which have, per one molecule, larger potential for the global warming than carbon dioxide by several decades, is evaluated. The effect of uncertainties in line parameters, i.e., absorption intensity and half-width, is evaluated for CO₂ and N₂O by calculating variations in radiative forcing due to adding 10 % deviation to or using two different year dataset of line parameters. The uncertainties in line parameters are found to yield, irrespective of strong(CO₂) or weak(N₂O) absorption, variations of nearly the same magnitude in radiative forcing as those of uncertainties. A similar result is obtained for uncertainties in the absorption cross section of CFC-11 and CFC-12.

[Key Words]

Greenhouse Effect, Methane, Nitrous Oxide, Chlorofluorocarbons