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2. Model overview
The model used in this study has been developed by using the Center
for Climate System Research/National Institute for Environmental
Studies(CCSR/NIES) AGCM. This model is aimed at studying the global
distribution and budget of tropospheric ozone and its precursors,
and radiative effect of tropospheric ozone. The horizontal resolution
is T21(5.6ox5.6o) with 32 layers in the vertical from the surface up to about
40 km altitude. In the present configuration of the model, the
chemical component of the model predicts the concentration of
24 chemical species between the surface and approximately 20 km
altitude, including 52 chemical reactions and 11 photolytic reactions.
In this study, only ethane and ethene are considered as NMHCs
trace gas. The model, however, can represent background chemistry
of the troposphere. More detailed chemistry including biogenic
NMHCs is now being implemented. The model also includes surface
emission and wet/dry deposition. Surface emission data are mainly
taken from Olivier et al., 1996. Detailed description will be discussed in Sudo et al.,(to be submitted).