Regional land-atmosphere coupled model (JSM-SiBUC) is applied to the
GAME-HUBEX region to produce a high accuracy dataset with 30km resolution. The period of the dataset is from 1998/6/21 00Z to 1998/7/22 00Z (31days). To perform the regional 4DDA (four dimensional data assimilation) accurately, not only the used model but also the external dataset is very important. As for the main atmospheric model, JSM (Japan Spectral Model) was provided from JMA (Japan Meteorolocal Agency) for the GAME community. As for the land surface model, latest version of SiBUC is adopted to describe presicely the land surface condition within the domain, especially irrigated farmland and paddy field must be expressed. As for the external dataset, GAME-Reanalysis Ver1.5, which was produced by JMA, is used for initial and external boundary condition. Preliminary simulation was executed. For some events (ex. end of June), simulated rainfall pattern and its amount was good accordance with surface measurements. But for other events
(ex. 2nd of July), simulated rainfall was much smaller than observed one. Through the comparison with upper air sounding data, lower level specific humidity of GAME-Reanalysis data was found to be smaller than observed one for that case. Therefore, upper air sounding data in the whole GAME-HUBEX region are re-assimilated to produce more accurate initial and boundary conditions. The final dataset of this regional 4DDA includes surface fluxes (sensible heat, latent heat, etc.) and surface state variables (soil moisture, surface temperature, etc.) as well as atmospheric state variables (temperature, humidity, wind, etc.).
Submittal Information
Name :
Date :
Kenji Tanaka
09-Aug-04-17:21:17
Organization :
Theme :
Kyoto University
Theme 5
Address :
Presentation :
WRRC, Disaster Prevention Research Institute, Gokasho, Uji, 611-0011