| Summary: | 碩士 === 國立中央大學 === 大氣物理研究所 === 102 === Indochina artificial activities cause a lot of biomass burning events in each spring (dry) season. The interaction between cloud and aerosol will not only affect radiation budget and water circulation system, but also the climate change and human health. According to above, the interaction must be taken into an issue, but the seldom research in the past literatures. In this study, we will investigate the artificial activities in Indochina, and discuss its interaction and influence.
Because atmospheric aerosols chemical composition, mixed patterns, and particle size can affect the formation of the cloud condensation nuclei, so we used CCN counter, SMPS sizer, CPC, and other aerosol instruments to do in-situ aerosol monitoring at Doi Ang Khang mountain, north of Thailand (19.93˚N，99.05˚E，1536m) and Lulin Mountain, Taiwan (23.47˚N，120.87˚E，2862m), then analyzed biomass burning aerosol properties and aerosol activation properties according to the data from these instruments. The observation time is during 2/22~4/8 2013. This period is Thailand's dry (spring) season, and this area occurred biomass burning events continually. By backward trajectory path analysis, we found that different air source’s aerosol properties have considerable variations, and we can classify into three events. The first event, A, is during 3/13~15. In this event, the impact of overseas transport and biomass burning showed the better hygroscopic and high activation ratio. The second event, B, is during 3/17~20, because the affection of biomass burning is serious and the biggest in these three events, so the hygroscopic and activation ratio decreased. The third event, C, is during 3/22~24, the air mass transportation is above the boundary layer. This study speculates that due to aerosol aging, so the hygroscopic and activation ratio are the lowest.
Lulin station located on the downstream of Indochina and China, and we found the trajectory of air mass pass through the artificially pollution area in China, and the biomass burning source regions in Indochina, so we speculated aerosol properties will affect by the trajectory of air mass. In this study, we classified into three events, too. The first event, I, is during 3/13~15. According to the result of the backward trajectory, we found that the aerosol property will be affected by biomass burning source region, showing the low hygroscopic and activation ratio. The second event, II, is during 3/16 ~18. Its air mass transportation is passed through the northeast of China, Korea, Japan and other regions, so the aerosol property will be affected by artificially pollution. The third event, III, is during 3/19~20. This event is similar to event I, but the degree of pollution is stronger.
Overall, the different source region and the influence of transported path will cause the more variations of the aerosol properties, and the result of the downstream test shows different property between these two regions. Combining these into results, the research of Indochina artificial activities will be completed and the influence of Cloud Condensation Nuclei (CCN) will also be clearly in this study.
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