低挥发性有机物大气氧化反应与二次有机气溶胶形成机制研究现状
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摘要
二次有机气溶胶(SOA)是大气颗粒物的重要组成部分,准确评估其在大气环境中的产生,是全面认识气溶胶的环境、气候与健康效应的关键所在.随着研究的进展,人们发现曾经被忽略的低挥发性有机物(LVOCs)的大气氧化反应,可能是二次有机气溶胶的重要来源,因此逐渐引起人们的广泛关注.基于国内外近年来相关研究的进展,本文对低挥发性有机物的大气氧化反应及SOA的形成研究现状进行了总结.从LVOCs在大气中的基本氧化机制出发,较为详尽地展示了迄今为止关于LVOCs的实验室定性与定量研究、场地观测研究以及理论模式研究.鉴于LVOCs研究面临的困难,如LVOCs的难以探测性、其在大气中反应的复杂性和环境的多变性、以及理论模拟中多参数化等,本文提出了未来深入研究面临的挑战和可能的研究方向,有望为将来相关研究工作的开展提供借鉴,同时也将为国内二次有机气溶胶污染的防控减排提供科学参考.
Secondary organic aerosols( SOA) contribute significantly to fine aerosol particles in atmosphere. Therefore, accurate evaluation of their sources and formation is pivotal to fully understand their impacts on the environment,climate and human health. With the progress of the research,it has been found that the oxidation of primary low-volatility organic compounds( LVOCs),which was assumed originally to non-reactive,is an important contributor to the formation of SOA and is turning into a research focus. In this review,we outline the latest development on the oxidation of LVOCs and the corresponding formation of SOA,which consists of( 1) the main oxidation mechanism,( 2) the latest experimental processes,( 3) the typical field measurements,and( 4) the model studies. Due to the difficulties of their gas chromatograph detection,complexity of reactions,variability of atmosphere environment,uncertainty of modelling and so on,the major challenges ahead in laboratory,field and modeling studies of LVOCs oxidation are discussed. The discussion is believed to be helpful for future research directions,as well as for control strategy of pollution in China.
Secondary organic aerosols( SOA) contribute significantly to fine aerosol particles in atmosphere. Therefore, accurate evaluation of their sources and formation is pivotal to fully understand their impacts on the environment,climate and human health. With the progress of the research,it has been found that the oxidation of primary low-volatility organic compounds( LVOCs),which was assumed originally to non-reactive,is an important contributor to the formation of SOA and is turning into a research focus. In this review,we outline the latest development on the oxidation of LVOCs and the corresponding formation of SOA,which consists of( 1) the main oxidation mechanism,( 2) the latest experimental processes,( 3) the typical field measurements,and( 4) the model studies. Due to the difficulties of their gas chromatograph detection,complexity of reactions,variability of atmosphere environment,uncertainty of modelling and so on,the major challenges ahead in laboratory,field and modeling studies of LVOCs oxidation are discussed. The discussion is believed to be helpful for future research directions,as well as for control strategy of pollution in China.
引文
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