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Synoptic Circulation and Ozone Pollution over Two Major Cities in Eastern Thailand |
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| รหัสดีโอไอ | |
| Title | Synoptic Circulation and Ozone Pollution over Two Major Cities in Eastern Thailand |
| Creator | 1. Nosha Assareh 2. Kasemsan Manomaiphiboon 3. Thayukorn Prabamroong |
| Publisher | Joint Graduate School of Energy and Environment |
| Publication Year | 2557 |
| Keyword | ozone, back- trajectory, K-means clustering, long-rang transport, synoptic circulation |
| Abstract | In this work, a back-trajectory modeling approach was applied to study the impact of synoptic circulation and longrange transport of ozone (O3) and its precursors on surface O3 level in Chon Buri and Rayong, two highly industrialized and urbanized cities in eastern Thailand. For each city, daily kinematic trajectories with backward migration of 3 days were simulated for 16 O3 seasons (Nov-Apr) over 1997-2012, using FLEXTRA model. The K-means clustering method was then used to group all simulated trajectories into a number of unique clusters. The clustered trajectories and their corresponding citywide daily daytime (10-18 LT) maximum O3 (DDMXO3) were statistically analyzed. A total of five trajectory clusters were equally found for each city and the overall cluster patterns in both cities were similar. The corresponding DDMXO3 values were found to be significantly different (p-value <0.05, Tukey's test) in almost all pair of trajectory clusters in each city. Furthermore, for both cites, the average DDMXO3 found to be relatively large in trajectory clusters with continental origin as opposed to maritime cluster with relatively low values. It was also found that low-altitude trajectories are likely to be linked with higher O3 than high-altitude ones. These findings indicate the potential association between O3 and synoptic circulation. |
| ISBN | 978-616-92228-1-1 |
