碩士 / 弘光科技大學 / 環境工程研究所 / 98 / Previous studies have suggested that the ongoing global climate change will likely increase the intensity and frequency of extreme weather, such as typhoons. Since the beginning of global warming, it has become necessary to understand the influence of typhoons on air quality. Rare data, especially particulate measurements data could be used to establish the relationship between the air pollution and typhoons. One of main limiting factors is that most of the previous chemical analyses of particulates used a relatively long sampling time, which could dilute the temporal impact of particulate characteristics and their sources. This work, depending more time-resolved measurements, focus on the characteristics and sources of high particulate matter levels and the influence of typhoons and the Pacific high system. Depending on the measurements, two pollutant groups were clearly identified in this work. The first pollutant group was the emissions from neighboring riverbeds under the strong circulation of the typhoon in the driest season and characterized as high
coarse particle concentrations with high mass fraction of Ca2+. The second pollutant group was characterized as the formation and transport of secondary particles with prevalent ions of NH4+, NO3-, and SO42- and occurred in the sea-land breeze circulation under the influence the Pacific high system.
In order to emphasize the characteristics of secondary aerosols, the pollution with PM10 > 125 μg m-3 was defined as the heavy polluted episode and the pollution with PM10 < 125 μg m-3 was regarded as the light polluted episode. The total concentration of all water soluble ions in PM10 increased by 1.8 times during the heavy polluted period compared with the light polluted period. The lowest diurnal concentrations of PM10, PM2.5, NO3- and NH4+ occurred after midday and the highest concentrations were appeared near midnight during the heavy polluted periods.
| Identifer | oai:union.ndltd.org:TW/098HKU05515002 |
| Creators | 林世杰 |
| Contributors | 方國權 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 66 |
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