本研究利用繫留氣球搭載可分析15個粒徑範圍(由0.3到20μm)粒狀物濃度的光學微粒分析儀，並結合氣象分析及衛星定位儀(Tethersonde)與臭氧探空儀(Ozonesonde)，以連續升降方式觀測垂直剖面上之粒狀物濃度變化。粒狀物在大氣中的分佈主要以三種波峰為主，分別為特徵粒徑0.1μm、2.45μm及6.14μm粒徑；其中大粒徑波峰分佈在日間較為複雜、夜間較為固定，而較小兩種波峰特徵粒徑較無變化。各粒徑質量濃度剖面上，三種波峰都各佔一定比例。大粒徑佔約35~43%、中粒徑佔11~21%，而小粒徑則佔36~54%，隨高度而有所變化。

　　垂直剖面濃度分佈主要分成五種類型，分別為(1) 混合層初始發展型、(2)日間均勻混合型、(3) 混合層高度下降型、(4) 夜間穩定型與(5) 煙流影響型。在夜間及日出前主要受混合層高度變化、風場、逆溫層及煙流影響，粒狀物濃度剖面相當不均勻。而在中午混合層內粒狀物濃度垂直剖面則相當一致，濃度變化主要受光化反應對粒狀物生成影響，此時小於1μm微粒濃度有明顯增加。午後及夜間因擴散空間的減少，粒狀物濃度有較明顯增加，特別是中粒徑微粒，因溫度降低使成長的微粒較不易再揮發。而深夜至凌晨由於排放減少，並由於沉降作用，因而濃度降低。

　　在臭氧濃度與粒狀物濃度變化的比較上，在日照強盛時，隨著高度不同的光化程度不同有明顯正相關；一般在10點混合層達一定高度後，兩者相關係數達0.7以上，正午時可達0.9，顯示臭氧形成的光化反應中，同時的對粒狀物的形成有相當貢獻。夜間臭氧濃度變化與粒狀物濃度變化在不考慮風場變化與逆溫效應的垂直剖面通常成相反分佈，推論應是夜間臭氧濃度滴定效應的產物對粒狀物有形成的效應。

　　The reserch used tethered ballon with OPC, which can measure particle count concentrations in 15 size ranges from 0.3μm to 20μm, combining with ozonesonde and tethersonde to observe the diural variations of particle vertical profiles. Particle size distributions mainly form 3 modes, and the charactistic mode diameters are mostly 6.14μm, 2.45μm and 0.1μm(analyzed by SMPS), respectively.The charactistic diameter of the greatest mode varies significantly in daytime and less in nighttime, however much less variations are observed in smaller modes. The mass concentration contributions of three modes are 35~43%, 11~21%, and 36~54% for mode diameters of 6.14μm, 2.45μm and 0.1μm, respectively.

　　Vertical profiles can be classified into 5 types: (1)mixing height elevating type, (2)daytime well mixing type, (3)mixing height decreasing type, (4)nighttime stable type, and (5)plume effect type. Beside the noon, vertical profiles are not uniform because of temperature inverse layer, and plume from stationary source. At noon time, the atmophere mixs well, the vertical profiles are uniform. At this time, variation of particle concentration is mainly affected by photochemical reaction to paricle formation, especially in small size mode. Near sunset and at night with mixing height decreasing, the dispersion space of emission becomes smaller and the particle concentrations increase, particularly in medium size mode particles. At midnight and near dawn, particle concentrations decrease resulting from emission reducing and deposition effect.
In the comparison between ozone concentration variation and change of particle concentration, both have highly positive correlation. Normally, with the mixing height reaching a certain altitude at about 10 a’clock, the correlation coefficient is above 0.7, and close to 0.9 at noon. It means the photochemical reactions causing ozone concentration to increase will also contribute to the particle formation simultaneously. The variations of vertical profiles between ozone and particle concentrations seems to have opposite distributions, the difference may be because the reaction to reduce ozone concentration will contribute to the particle formation at night regardless of the change in wind direction and temperature inverse layer effect.

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