Abstracts for the 6th International GAME Conf.
3-5 December 2004
Kyoto Japan
Validation study of MATSIRO land surface model using the observed data in tropical monsoon climate of Thailand
Shin Miyazaki (1), Wonsik Kim (2), Yukiko Hirabayashi (3), Shinjiro Kanae (4), Taikan Oki (5)
(1) Institute of Industrial Science, University of Tokyo /Japan Science and Technology Agency
(2) Seoul University, Korea
(3) Yamanashi University, Japan
(4) Research Institute of Humanity and Nature, Japan
(5) Institute of Industrial Science, University of Tokyo
The objective of this study is to assess the performance of the land surface model, minimal advanced treatments of surface interaction and runoff (MATSIRO) in tropical monsoon climate of Thailand. The testing of MATSIRO was carried out offline mode (i.e., decoupled from complex interactions in the full 3D model). Driving and validation data sets were prepared for a one year period (2003) with 30-min time step, which wefve obtained at Tak flux measurement (TFM) site over mixed land use of tropical deciduous forest, grassland and paddy filed. The model was parameterized based on the standard parameter values generally used within 3D version of MATSIRO namely ISLSCP-1 data set. At TFM site there is clear seasonal variation of rainfall that is divided into dry season and rainy season. The simulated surface soil moisture was well corresponded to the temporal change of observed surface soil moisture when large amount of precipitation occurred. However, the reproducibility of surface soil moisture became bad in prolonged dry period. The simulated response to the rainfall in deep soil layer was stronger than that of observed. The simulated 1-m total soil moisture was about 15% larger than that of observed except some period. During the period with successive rainfall, the simulated evapotranspiration (ET) well reproduced the observation while the simulated ET showed discrepancies with observed ET in dry period. In dry season before rainy season, simulated transpiration was comparable to soil evaporation. The simulated transpiration became larger than the soil evaporation from late rainy season and dry season after rainy season. The annual precipitation of TFM site was 1155mm. The simulated annual water budget showed about 885 mm for the ET, about 290 mm for the runoff. The observed annual ET was about 855 mm, which was nearly same as the simulated value. It suggests that the discrepancy of ET in dry season had small effect on annual water budget because the amount of ET was only about 30% of annual evapotranspiration.
Submittal Information
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Institute of Industrial Science, University of Tokyo / Japan Science and Technology Agency | |
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4-6-1 KOMABA, MEGURO-KU, Tokyo 153-8505, Japan | |
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miyashin@iis.u-tokyo.ac.jp | |