| Summary: | 碩士 === 國立成功大學 === 環境工程學系碩博士班 === 90 === The air quality in the Kao-Ping airshed, South Taiwan has been deteriorating for a long time due to negative impact from the higher ground level concentrations of ozone and PM10. Ozone impact could result from a series of reactions between precursors, such as NOx and volatile organic compounds (VOCs). In addition to VOCs emitted from the anthropogenic activities, VOCs generated from natural sources, such as forest, can be a significant contribution to the overall hydrocarbon inventory in many cases. Although the amount of VOCs emitted from natural source, which is known as biogenic source, may not be the highest level in atmosphere, some species in biogenic VOCs have the strongest reactivity, thus strongly influence various photochemical reaction occurred in atmosphere. The major contributer of biogenic VOCs is plant, with different emission rate depending on different plant species. Because forest particularly makes up 59% of land area in Taiwan, the biogenic VOCs emissions from forest and farmland could play an important role in photochemical reactions in atmosphere. Therefore, to trace down such impacts with regards to ozone generation, a thorough emission inventory was developed in this study with the aid of remote sensing (RS) technology. Based on the anthropogenic emission database (TEDS 4.2) combined with the biogenic emission database, it enables the advanced analysis of ozone episode, between October 25 and 26, 2001, in the Models-3/CMAQ framework derived by US EPA. MM5 meteorological forecasting modeling analysis was performed to provide credible wind field information during the event. The main focus has been placed on the inclusion or exclusion of biogenic sources in terms of the impact on ground-level ozone concentration. The initial results show that ground-level ozone concentrations simulated in the Kaohsiung area was not significantly influenced by the VOCs emitted from biogenic sources. This implies that anthropogenic emissions require further control in order to mitigate the ozone impact. Overall, the management alternative evaluation by simulating the possible reduction of VOCs at three groups of major point source in the Kaohsiung City show that there is no significant difference with regards to which area must be firstly implemented the reduction program.
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