NAME = Shiori Sugimoto ORGANIZATION = Geophysical Institute, Graduate School of Science Tohoku University ADDRESS = Aoba-ku, Sendai, 980-8578, Japan COUNTRY = Japan PHONE = 022-217-5784 FAX = 022-217-7758 E-MAIL = sugimoto@wind.geophys.tohoku.ac.jp POSTER_ONLY = yes THEME = T2 DATE = 30-Jul-04-20:18:46 ABSID = T2SS30Jul04201846 TITLE = Numerical simulation of precipitation phenomena during the monsoon season on the Tibetan Plateau AUTHOR_1 = shiori sugimoto INSTITUTION_1 = Geophysical Institute, Graduate School of Science Tohoku University PRESENTER = AUTHOR_1 AUTHOR_2 = weiming sha INSTITUTION_2 = Geophysical Institute, Graduate School of Science Tohoku University AUTHOR_3 = ken'ichi ueno INSTITUTION_3 = School of environmental science, The university of Siga prefecture ABSTRACT = During the monsoon season, the precipitation variation on the Tibetan Plateau is remarkable because it is strong affected by different dominate synoptic-scale meteorological systems in the middle latitude (Ueno et al., 2001). One is associated with the synoptic-scale front passage of the Plateau (hereafter, referenced as case1) and the other is associated the meso-scale convection on the Plateau (hereafter, referenced as case2). Our purpose in this study is to simulate the different precipitation phenomena@(case1 and case2) with a non-hydrostatic numerical model, and try to make the mechanism clear. The model we use is MRI/NPD-NHM (non-hydrostatic model developed by Institute of Meteorological Research/Japan Meteorological Agency). Initial data and boundary data was constructed from 0.5degree space resolution GAME-reanalysis data. Topography data is GTOPO30. The model has 200~200 grid points in the horizontal directions and 38 layers in the vertical direction. The grid spacing in the horizontal directions is ˘x=˘y=30km. Our simulation results have been compared with the GAME-reanalysis data. For case 1 and 2, geo-potential height and wind at 250 and 500 hPa are consistent well with the GAME-reanalysis data. Furthermore, the calculation results show much more details on the flows than the GAME-reanalysis data could give. Although, the calculated wind velocity is somewhat larger near the Himalayas, it is found that the simulation is quit realistic. Now, date analysis is being carried out, and we will give more results in the presentation.