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KMID : 1024520060150080759
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Journal of the Environmental Sciences
2006 Volume.15 No. 8 p.759 ~ p.774
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The Effects of the Changed Initial Conditions on the Wind Fields Simulation According to the Objective Analysis Methods
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Kim Yoo-Keun
Jeong Ju-Hee
Bae Joo-Hyun
Kweon Ji-Hye
Seo Jang-Won
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Abstract
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We employed two data assimilation techniques including MM5 Four Dimensional Data Asssimilation (FDDA) and Local Analysis and Prediction System (LAPS) to find out the effects of the changed inetial conditions on the wind fields simulation according to the objective analysis methods. We designed 5 different modeling cases. EXP B used no data assimilation system. Both EXP Fl using surface observations and EXP F2 with surface and upper-air observations employed MM5 FDDA. EXP Ll using surface observations and EXP L2 with surface and upper-air observations used LAPS. As results of, simulated wind fields using MM5 FDDA showed locally characterized wind features due to objective analysis techniques in FDDA which is forcefully interpolating simulated results into observations. EXP Fl represented a large difference in comparison of wind speed with EXP B. In case of LAPS, simulated horizontal distribution of wind fields showed a good agreement with the patterns of initial condition and EXP Ll showed comparably lesser effects of data assimilation of surface observations than EXP Fl. When upper-air observations are applied to the simulations, while MM5 FDDA could hardly have important effects on the wind fields simulation and showed little differences with simulations with merely surface observations (EXP Fl), LAPS played a key role in simulating wind fields accurately and it could contribute to alleviate the over-estimated winds in EXP Ll simulations.
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KEYWORD
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Data assimilation techniques, Objective analysis, Initial condition, Four Dimensional Data Assimilation, Local Analysis and Prediction System
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