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KMID : 1024520090180030271
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Journal of the Environmental Sciences
2009 Volume.18 No. 3 p.271 ~ p.281
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The Effect of Atmospheric Flow Field According to the Radius Influence and Nudging Coefficient of the Objective Analysis on Complex Area
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Choi Hyun-Jung
Lee Hwa-Woon
Sung Kyoung-Hee
Kim Min-Jeong
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Abstract
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In order to reduce the uncertainties and improve the air flow field, objective analysis using observational data is chosen as a method that enhances the reality of meteorology. To improve the meteorological components, the radius influence and nudging coefficient of the objective analysis should perform a adequate value on complex area for the objective analysis technique which related to data reliability and error suppression. Several numerical experiments have been undertaken in order to clarify the impacts of the radius influence and nudging coefficient of the objective analysis on meteorological environments. By analyzing practical urban ground conditions, we revealed that there were large differences in the meteorological differences in each case. In order to understand the quantitative impact of each run, the Statistical analysis by estimated by MM5 revealed the differences by the synoptic conditions. The strengthening of the synoptic wind condition tends to be well estimated when using quite a wide radius influence and a small nudging coefficient. On the other hand, the weakening of the synoptic wind is opposite.
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KEYWORD
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MM5, Objective analysis, Site coherence analysis, Radius influence, Nudging coefficient
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