為討論高屏地區冬季奈米微粒之粒徑分佈與形成機制，本研究採用2006年10月至2007年2月間南部超級測站之奈米微粒連續監測資料，研究重點則為濃度特徵描述、逐時濃度變化、高濃度事件來源與奈米微粒形成機制，研究方法則利用波峰分離法以獲得主要污染物之粒徑分佈。
南部地區冬季總顆粒(9.8-800nm)平均濃度約40000顆/cm3，粒徑範圍10-30nm之平均顆粒濃度約為13000顆/cm3，粒徑範圍30-90nm之平均顆粒濃度則約為17000顆/cm3，而粒徑範圍大於90nm之平均顆粒濃度則約為10000顆/cm3。 逐日觀測結果顯示南部奈米微粒之粒徑分佈可分為四個叢集，依發生時間定義為：早上叢集、中午叢集、晚上叢集與夜間叢集；除中午叢集之粒徑集中於30nm以下，其餘均集中於30-90nm。此外，假日之中午叢集濃度較非假日高，但假日之早上、晚上與夜間叢集濃度則較非假日低，原因可能為非假日因受交通源影響故有顯著之交通尖峰期叢集。高濃度事件可分為早上、中午、晚上與夜間高濃度事件，早上高濃度事件之濃度與NOx、CO相關，故推論早上高濃度事件應受上班之交通源影響；晚上高濃度事件之濃度則顯示與交通源無關；夜間高濃度事件則部分源自交通源而部分源自工業類別。奈米微粒之形成機制為液相凝滴反應與氣相反應之組合，但應以液相凝滴反應為主；污染源排放與液相凝滴反應均影響奈米微粒之濃度變化，但因正負成長速率出現頻率接近，故總成長速率而言屬於無明顯變化，污染源之排放會直接導致濃度增加，故推論污染源排放為高濃度事件主要貢獻源。

In order to understand the size distribution and formation mechanism of nanoparticles in Kaohsiung and Pingtong in winter, the data which was measured by SMPS+C in PM supersite form October 2006 to February 2007 were used in this srudy. The study focuses on the characteristics of concentration, temporal variation, the concentration of episodic events, and formation mechanisms of nanoparticle.The measured raw data were fitted by combination of log-normal distributions.
Total number concentration for particle with diameter of 9.8 to 800 nm is about 40000 #/cm3 in south Taiwan. Average concentrations of the size ranges of 10-30nm, 30-90nm and over 90nm are 13000, 17000, and 10000 #/cm3, respectively. Diurnal variations show size distribution of nanoparticles can be classified into 4 clusters: (1)morning cluster, (2)noon cluster, (3)evening cluster, and (4)night cluster. Particle size range of noon cluster is less than 30nm, but the others are 30 to 90nm. Furthermore, the concentration of noon cluster on weekend is greater than that on weekdays. But the concentrations of the other cluster on weekend are lower than those on weekdays. The difference may be due to the rush hours on weekdays. Episodic events can be classified into 4 type: (1)morning events, (2)noon events, (3)evening events, and(4)night events. High concentrations of morning events were highly related with NOx and CO concentrations, and it implied that morning events are affected by mobile sources. There is no relationship between evening events and mobile source; some night events are related with mobile emission, and some are related with stationary sources. The formation mechanisms of nanoparticles are the combination of the reaction within droplet and gas phase reaction, but the former is the major mechanism in this research. Primary emission and droplet reaction both affect variations of nanoparticle concentrations. Because the frequencies of positive and negative growth rates are close, the net growth rate is negligible. Therefore, primary emission is major contribution in the episodic events.

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