Institute for Atmospheric and Earth System Research, Faculty of Science , University of Helsinki , Helsinki 00014 , Finland.
Aerosol and Haze Laboratory , University of Chemical Technology , Beijing 100029 , P.R. China.
Chem Rev. 2019 Mar 27;119(6):3472-3509. doi: 10.1021/acs.chemrev.8b00395. Epub 2019 Feb 25.
Highly oxygenated organic molecules (HOM) are formed in the atmosphere via autoxidation involving peroxy radicals arising from volatile organic compounds (VOC). HOM condense on pre-existing particles and can be involved in new particle formation. HOM thus contribute to the formation of secondary organic aerosol (SOA), a significant and ubiquitous component of atmospheric aerosol known to affect the Earth's radiation balance. HOM were discovered only very recently, but the interest in these compounds has grown rapidly. In this Review, we define HOM and describe the currently available techniques for their identification/quantification, followed by a summary of the current knowledge on their formation mechanisms and physicochemical properties. A main aim is to provide a common frame for the currently quite fragmented literature on HOM studies. Finally, we highlight the existing gaps in our understanding and suggest directions for future HOM research.
高度含氧有机分子（HOM）是通过涉及挥发性有机化合物（VOC）产生的过氧自由基的自动氧化在大气中形成的。HOM 在预先存在的颗粒上凝结，并且可以参与新颗粒的形成。因此，HOM 有助于二次有机气溶胶（SOA）的形成，SOA 是大气气溶胶的一个重要且普遍存在的组成部分，已知会影响地球的辐射平衡。HOM 是最近才被发现的，但人们对这些化合物的兴趣迅速增长。在这篇综述中，我们定义了 HOM，并描述了目前用于鉴定/定量它们的技术，然后总结了目前对它们的形成机制和物理化学性质的认识。主要目的是为目前关于 HOM 研究的相当分散的文献提供一个共同的框架。最后，我们强调了我们理解中存在的差距，并为未来的 HOM 研究提出了方向。
