HR: 1340h
AN: A53A-0851    [Abstracts]
TI: Regional Climate Study over the Kyushu, Japan based on the annual simulation of a Mesoscale Meteorological Model
AU: * Yoshida, Y
EM: yasuhiro@riam.kyushu-u.ac.jp
AF: Earth System Science Technology, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka, 816-8580 Japan
AU: Uno, I
EM: iuno@riam.kyushu-u.ac.jp
AF: Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka, 816-8580 Japan
AB: High-resolution mesoscale meteorological model with two-way nesting technique (minimum grids: 2km) was applied to study the seasonal variation and the geographical distribution of local circulation, prevailing wind and regional climate over the Kyushu, Japan. As a mesoscale meteorological model, RAMS (Regional Atmospheric Modeling System) was used and all of cloud microphysical process for precipitation, cumulus convection, boundary-layer turbulence and land surface process options were used in this study. The model results were validated using the Japan Meteorological Agency's observation network data within Kyushu area. We found the following, (1) the simulated temperature and wind speed explained the daily and seasonal variations of observed data very well. Correlation coefficient between the model results and the observation data for wind and temperature took the very high score, (2) the annual variation of the daily average wind speed on the Pacific Ocean side took the smaller value than that of the Japan and East China Sea side, (3) model results retrieved the precipitation events very well, however the model underestimated the total precipitation amount. We also found that the simulated temperature tends to overpredict during the overcast and/or small precipitation conditions, especially in summer time, (4) analysis of the frequency distribution of wind direction and wind speed shows that the model correctly caught the prevailing wind field for each season and we can confirm the importance of the local circulation (such as the land and sea breezes) for the formation of regional climate in Kyushu, (5) composite analysis indicated that the sea breeze from the Japan Sea and East China Sea side invaded further inland region than that from the Pacific Ocean side in summer.
DE: 3329 Mesoscale meteorology
DE: 3337 Numerical modeling and data assimilation
DE: 1620 Climate dynamics (3309)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting