| Summary: | 碩士 === 國立高雄第一科技大學 === 環境與安全衛生工程系碩士班 === 106 === Plant-driven biological volatile organic compounds (BVOC), important
precursors for ozone and secondary organic aerosol (SOA) formations in the
atmospheric oxidation processes, are accounted for more than 50% of total
VOCs emissions in Taiwan. However, BVOCs oxidation processes in the
atmosphere have never been fully investigated. The major objectives of this
study were to understand the levels of BVOCs and new particle formation
(NPF) process in a middle-altitude forest recreation area (Xitou); and to
understand the vertical distribution of atmospheric VOCs, carbonyls and other
pollutants between Xitou and Zhushan (a low-altitude town). Interaction of
anthropogenic and biogenic emissions and subsequent atmospheric oxidation
processes were also evaluated in this study. The results show that the levels of
isoprene, benzene, toluene, xylenes (IBTX) in summer Xitou (0.69±0.5,
0.18±0.19, 0.29±0.26 and 0.23±0.26 ppb, respectively) were lower than that in
summer Zhushan (1.78±0.95, 0.38±0.09, 1.38±1.07 and 0.26±0.10 ppb,
respectively). The levels of formaldehyde and acetaldehyde in Summer Xitou
(5.24±3.0 and 3.08±1.85 ppb) were both higher than that in summer Zhushan
(2.53±0.96 and 1.20±0.37 ppb). On the contrary, The levels of formaldehyde
and acetaldehyde in winter Xitou (4.32 ±2.66, 2.62 ±3.36 ppb) were both lower
than that in winter Zhushan (6.44 ±2.86 and 4.38 ±5.92 ppb). The levels of
primary emissions of formaldehyde and acealdehyde in Xitou were less than
that in Zhushan. The major formaldehyde and acetaldehyde in summer Xitou
may be contributed by the oxidations of BVOCs in the middle-altitude forest
area. Results from Xitou chamber study show that the NPF processes usually
occurred in the sunny mornings.
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