Influence of relative humidity on cyclohexene SOA formation from OH photooxidation
• 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
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.
We’re excited to announce the publication of a new article in ACPD. This article provides new information on the roles of NOx level and RH on the formation of SOA from the photooxidation of furan in the presence of NaCl seed particles. Strong evidences indicate that both the RH and different NOx levels have a significant effect on SOA formation.
Dependences of maximum O3 concentration, SOA mass concentration, SOA yield and liquid water content(LWC) on relative humidity (RH).
Jiang, X., Tsona, N. T., Jia, L., Liu, S., Zhang, H., Xu, Y., and Du, L. 2019: Secondary organic aerosol formation from photooxidation of furan: effects of NOx and humidity, Atmos. Chem. Phys., 19, 13591–13609, https://doi.org/10.5194/acp-19-13591-2019
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