https://scholars.lib.ntu.edu.tw/handle/123456789/77134
標題: | 台灣反應性軌跡模式之應用與發展及跨空品區現象分析(I) | 作者: | 張能復 | 關鍵字: | 臭氧;軌跡分析;氣象條件;光化學反應;Ozone;backward trajectory;meteorological parameter;photochemical reaction | 公開日期: | 31-七月-2002 | 出版社: | 臺北市:國立臺灣大學環境工程學研究所 | 摘要: | 本文以10 月06~10 日與11 月22~26 日兩個高臭氧污染,利用化學性、物理性與排 放性三個方向作南高屏地區高臭氧事件的成因解析。在化學性作用方面,無論以溫度 (日平均溫度大於295K)、光照時數(日照時數大於3.4 小時)與雲覆蓋量(9-16 時平均雲 覆蓋量小於0.3)來評估,南高屏地區提供良好光化學反應的環境,化學性作用為一充 分條件;物理性作用為影響南高屏地區最重要的影響因子,在綜觀尺度的影響下,兩 個高臭氧污染事件中南高屏地區的測站風速都很低,最嚴重的11 月26 日日間最高測 站風速低至3m/s,而從測站風速、混合層高度、通風指數等因子來評估南高屏地區的 擴散條件,可以看出11 月高臭氧污染逐日遞增的趨勢。 In this research, the cause of the ozone episodes in southern Taiwan by analyzing the chemical、 physical and emissive effects were studied. In chemical effects, high temperature(the daily mean temperature greater than 295K)、low cloudiness(the mean cloudiness from 9A.M. to 4 P.M smaller than 0.3 ) and the great amount of daylight of southern Taiwan provide the favorable environment for the photochemical production of ozone. In the aspect of physical effect, including diffusion and convection, the decreasing trend of diffusion of the ozone episode responds to the increasing trend of concentration of ozone in November. But the ability of diffusion is not the main cause of the ozone episodes in southern Taiwan. By the analysis of backward trajectory and wind field, we could find that the prevailing wind is not significant because of the eastern terrain barrier and the sea-land breeze dominates in southern Taiwan. Because of light wind and sea-land breeze, there is a great chance for precursors mostly from local pollution sources to accumulate in the atmospheric boundary layer. In emissive effects, emissions of NOx are contributed by transportation andpoint sources (such as the power plants and petroleum refinery etc.); the emissions of NMHC (Non-Methane Hydrocarbons) are contributed by the point sources and the metropolitan pollution. In the conclusion, the weak wind (convection) plays the most important |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/22097 | 其他識別: | 902621Z002014 | Rights: | 國立臺灣大學環境工程學研究所 |
顯示於: | 環境工程學研究所 |
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902621Z002014.pdf | 398.13 kB | Adobe PDF | 檢視/開啟 |
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