Numerical simulation of terrain-induced mesoscale circulation in the Chiang Mai area, Thailand
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The regional atmospheric modeling system (RAMS) was applied to Chiang Mai province, a mountainous area in Thailand, to study terrain-induced mesoscale circulations. Eight cases in wet and dry seasons under different weather conditions were analyzed to show thermal and dynamic impacts on local circulations. This is the first study of RAMS in Thailand especially investigating the effect of mountainous area on the simulated meteorological data. Analysis of model results indicates that the model can reproduce major features of local circulation and diurnal variations in temperatures. For evaluating the model performance, model results were compared with observed wind speed, wind direction, and temperature monitored at a meteorological tower. Comparison shows that the modeled values are generally in good agreement with observations and that the model captured many of the observed features.
KeywordsWind Field Regional Atmospheric Modeling System Valley Wind South Wind Synoptic Wind
The authors would like to express their grateful appreciation to the Joint Graduate School of Energy and Environment (JGSEE) at King Mongkut’s University of Technology Thonburi and State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Chinese Academy of Sciences for supporting this study. This study was supported by grants from the Ministry of Science and Technology of China (Grant no. 2007CB407303) and the National Natural Science Foundation of China (Grant no. 40333029). The authors are very grateful to the Pollution Control Department (PCD) for kindly providing necessary ambient air quality and meteorological data, and thank the anonymous reviewers for their useful comments and suggestions, which have contributed significantly to improving the manuscript.
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