组内消息
2019-05-19
Influence of relative humidity on cyclohexene SOA formation from OH photooxidation
Highlights
• Combined effects of OH and RH on cyclohexene SOA formation were studied.
• The formation of oligomers at high RH was responsible for the increase of the SOA yield.
• High RH increases the OH uptake coefficient of SOA, and promotes SOA aging.
• Oligomers formation mechanism from cyclohexene photooxidation at high RH was proposed.
Liu, S., Tsona, N.T., Zhang, Q., Jia, L., Xu, Y., Du, L., 2019. Influence of relative humidity on cyclohexene SOA formation from OH photooxidation. Chemosphere 231, 478–486. https://doi.org/10.1016/j.chemosphere.2019.05.131
Full text:https://doi.org/10.1016/j.chemosphere.2019.05.131
组内消息
2019-02-19
Short Summary: The significantly negative effects of relative humidity (RH) on secondary organic aerosol (SOA) formation from m-xylene under low NOx conditions were observed. The significant RH effects on chemical compositions of SOA are identified, in which highly oxygenated molecules (HOMs) are dominant. Our results show that the decrease of SOA formation under high RH conditions is mainly attributed to the suppression of the formation of oligomers and HOMs.
Zhang, Q., Xu, Y., and Jia, L.: Secondary organic aerosol formation from OH-initiated oxidation of m-xylene: effects of relative humidity on yield and chemical composition, Atmos. Chem. Phys., https://www.atmos-chem-phys.net/19/15007/2019/acp-19-15007-2019.html, 2019.
组内消息
2018-06-26
大气中SOA是由其前体物VOCs经过在大气中的化学转化形成的颗粒态有机物，对天气、气候、大气环境以及人体健康都有重要影响，但目前对其化学组成及其形成过程还认识很不足，因而围绕SOA的研究是目前大气化学、大气环境和天气气候研究中的一个重要研究领域。本文就过去几十年来实验室研究SOA形成过程的工作，特别是近5年我国科研工作者所做的研究工作做了概要性的综述，重点以烟雾箱系统的研究成果进行较系统的分析总结。在概要论述了我国科研单位在发展烟雾箱系统和其表征研究后，重点就萜烯物、苯系物、小分子等VOCs形成SOA的模拟研究进行了总结分析，明确了我国在这些研究方向中所取得的科研成果。可以预料，在未来的研究中，我国学者不仅在学术上会对国际社会做出贡献，也会对我国大气环境质量的改善作出贡献。笔者以为，我们在以下的某些研究方面取得了进展，可望在今后会有更大的进展。
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