HR: 1330h
AN: A52C-0803    [PDF]
TI: Effect of the Horizontal Resolution of General Circulation Model on the Ozone Distribution Simulated by Chemical Transport Model
AU: * Shibata, K
EM: kshibata@mri-jma.go.jp
AF: Meteorological Research Institute, 1-1 Nagamine, Tsukuba, 305-0052 Japan
AU: Deushi, M
EM: mdeushi@mri-jma.go.jp
AF: Meteorological Research Institute, 1-1 Nagamine, Tsukuba, 305-0052 Japan
AU: Sekiyama, T
EM: tsekiyam@mri-jma.go.jp
AF: Meteorological Research Institute, 1-1 Nagamine, Tsukuba, 305-0052 Japan
AU: Orito, K
EM: orito@mri-jma.go.jp
AF: Meteorological Research Institute, 1-1 Nagamine, Tsukuba, 305-0052 Japan
AB: Effect of the horizontal resolution of winds and temperature used in the transport of chemical species are investigated with a 3-D chemical transport model of Meteorological Research Institute, MJ98-CTM. The vertical resolution is fixed to be 45 layers extending from the surface to 0.01 hPa (about 80 km), while the horizontal resolution of GCM module is varied. Control run uses T21 resolution both for GCM and CTM modules, and experiment run uses T42 resolution for GCM module. T21 and T42 resolutions correspond to 300 km and 600 km grid sizes, respectively. GCM module is a full primitive spectral model, which includes major physical processes. CTM module treats 34 long-lived species including 7 families, and 15 short-lived species with 79 gas phase reactions, 34 photochemical reactions and 9 heterogeneous reactions on polar stratospheric clouds and sulfate aerosols. Transport scheme is a flux form semi-Lagrangian type in the vertical and, at once, a simple semi-Lagrangian type in the horizontal with cubic interpolation. Greenhouse gases are not treated interactively, i.e., CTM-simulated ozone, methane and nitrous oxide are not used in the radiation scheme in GCM module. Climatological values of sea surface temperature and greenhouse gases for GCM module are used and so do those of tropospheric-origin species for CTM module. Time integration is made for five years and the control run of T21-GCM coupled with T21-CTM (T21-T21) and the experiment run (T42-T21) are compared for the simulated fields of chemical species, focusing on ozone. Since the increase in GCM horizontal resolution does not necessarily improve simulated fields of winds and temperature, similar experiment is also made with the nudging force toward observed winds and temperature.
DE: 0340 Middle atmosphere--composition and chemistry
DE: 0341 Middle atmosphere--constituent transport and chemistry (3334)
DE: 5405 Atmospheres--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting