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《第十五届海峡两岸气胶技术研讨会论文集》2017年
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Seasonal variation of secondary organic aerosol in PM_(2.5) in rural Guangzhou,Southern China

袁琪  张颖仪  赖森潮  
【摘要】:Secondary organic aerosols(SOA) are important organic constituents in PM_(2.5).To better understand the atmospheric abundances,seasonal variations,influencing factors of SOA in Pearl River Delta region,a one-year campaign was conducted in rural Guangzhou to collect fine particulate matter(PM_(2.5)) samples from March 2012 to February 2013.Fourteen SOA tracers in PM_(2.5) have been analyzed by gas chromatography-mass spectrometry.Isoprene and Monoterpene SOA tracers were significantly higher in summer and autumn but much lower in winter and spring,showing the influence of temperature on emission rates.Besides,higher levels of atmospheric oxidants(NOx and ozone) could lead to an enhancement of monoterpene SOA concentrations in autumn and winter.Sesquiterpene,toluene and naphthalene SOA tracers showed higher levels in autumn and winter.Three episodic periods with high SOA loadings were investigated and the influence of the factors such as temperature,air pollutants and regional sources on SOA formation was discussed.

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