| Summary: | 碩士 === 國立中央大學 === 大氣物理研究所 === 98 === This research is aimed to study the microphysical characteristics of cloud condensation nuclei (CCN) at Mt. Bamboo (25.11 ° N, 121.31 ° E, 1,103 m) and the National Museum of Marine Biology and Aquarium (NMMBA, 22.05 ° N, 120.699 ° E, 98 m) using a DMT continuous flow stream wise thermal gradient cloud condensation nuclei counter.
At Mt. Bamboo, in-situ measurements were taken during January 20 to March 9, 2010. The results show the CCN concentrations had diurnal variation, which was influenced by different air sources. Additionally, the principal ions in cloud water were found to be Cl-, Na+ for more than 42% of the total ion concentration. Average ratio of nss-SO4 2 - / NO3- was 1.4, indicating the long-range transport of pollutants. Besides, similar measurements of CCN were performed at NMMBA druing March 14 to April 4, 2010 and April 17 - 19, 2010. The results show the dust storm carrying with secondary pollutants will increase cloud condensation nuclei concentration. The AOD675nm also appeared at a high value of 1.3, and Angstrom exponent indicated the coarse particle size of dust aerosol particles.
According to the expression NCCN = CSk, the NMMBA air type of observation was close to the continental air mass. Cloud condensation nuclei microphysical parameters C and k were about 6,844 cm -3 and 2.04, while the Mt. bamboo air types were closer to the sea-based air mass, the C and k values were 2,436 cm -3 and 0.63.
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