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題名 | Applied and Intercomparison of Various Samplers in the Traffic and Rural Site of Taichung=臺中交通區及郊區不同採樣器之應用與比較 |
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作者 | 方國權; 張鎮南; 張冠甫; 楊定國; | 書刊名 | 弘光學報 |
卷期 | 32 1998.10[民87.10] |
頁次 | 頁127-144 |
分類號 | 445.6 |
關鍵詞 | 粒徑分佈; 質量中數粒徑; Size distribution; MMD; σ; |
語文 | 英文(English) |
中文摘要 | 臺中交通區及郊區微粒之粒徑分布分別以MOUDI,NRI,TSP,Universal等採樣器 來監測。交通區白天及夜晚粗顆粒佔 TSP 之比例分別為 49% 及 51%。郊區白天及夜晚粗顆 粒佔 TSP 之比例分別從 76% 到 85% 及 50% 及 91%。兩種採樣區在白天或夜晚之粒徑均呈 雙峰分佈。研究結果顯示,在交通區白天或夜晚時,風速增加,粗顆粒之數量亦隨之增加, 風速減弱時,便以細顆粒佔多數。同時,在交通區及郊區白天之質量中數粒徑皆大於夜晚部 分。白天部分與 風速的高相關性顯示,在交通區或郊區,風速大時容易將顆粗粒之粒子捲 揚進大氣環境中。 |
英文摘要 | Micro orifice uniform deposit impactor (MOUDI), Noll Rotary Impactor (NRI), TSP (Total Suspended Particle) and Universal samplers were used to determine the particle size distribution in the rural and traffic sampling site of Taichung. The ratios of coarse (2.5∼10 m)/TSP were from 44% to 56%, averaged 49% and from 24% to 63%, averaged 51% for day and night time, respectively in the traffic sampling site. And the ratio of coarse/TSP were from 76% to 85% and from 50% to 91% for day and night period, respectively in the rural sampling site. Size distributions of particle mass were all bimodal in either day or night period at rural and traffic sampling site. The results indicated that the day time particle size distribution shifted to the coarse particle mode as the wind speed increased, and shifted to the fine particle size mode as the wind speed decreased. This phenomenon also appeared in the night time of the traffic sampling area. It indicated that the mass median diameter (MMD) in the day time was larger than that of night time in both traffic and rural site, High relationship between geometric standard deviation (σg ) and wind speed during day period indicated that high wind speed coarse particles of larger size were entrained into the atmosphere at either traffic or rural area. |
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