关键词: 二次有机气溶胶, 单萜烯, 芳香族化合物, 形成机制, 有机分子示踪技术

Abstract: The formation of secondary organic aerosol (SOA) is one of the research focuses in atmospheric chemical process. In urban atmosphere, secondary organic carbon constitutes about 17%~65% of the total particulate organic carbon. Monoterpene and aromatics are the most important natural and anthropogenic precursors of SOA, respectively. The volatile precursors react with atmospheric oxidants such as hydroxyl (×OH), nitrate radical (NO3-) and O3 through multiple reaction pathways, producing semi-volatile secondary organics including diacids, multifunctional carbonyls and nitrate organics, etc. Theses compounds can distribute into particulate phase via adsorption and absorption processes, and will alter the property and environmental effects of ambient aerosols. Organic molecular markers are utilized to apportion the sources of atmospheric ambient aerosols, and organic diacids are potential tracers for SOA. In this article, the advances and problems in SOA research are reviewed, and future research recommendations are presented.

Key words: secondary organic aerosol, monoterpene, aromatics, formation mechanism, organic molecular tracer technique