globalchange  > 气候减缓与适应
DOI: 10.1029/2017JD028242
Scopus记录号: 2-s2.0-85050396562
论文题名:
Secondary Organic Aerosol Formation From Isoprene Epoxides in the Pearl River Delta, South China: IEPOX- and HMML-Derived Tracers
作者: He Q.-F.; Ding X.; Fu X.-X.; Zhang Y.-Q.; Wang J.-Q.; Liu Y.-X.; Tang M.-J.; Wang X.-M.; Rudich Y.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期:13
起始页码: 6999
结束页码: 7012
语种: 英语
Scopus关键词: aerosol composition ; aerosol formation ; atmospheric pollution ; chemical compound ; concentration (composition) ; high temperature ; photooxidation ; reactive transport ; summer ; tracer ; China ; Guangdong ; Zhujiang Delta
英文摘要: Atmospheric photooxidation of isoprene forms isoprene epoxydiols (IEPOX) and hydroxymethel-methyl-α-lactone (HMML) via hydroperoxyl radical (HO2) channel and NO/NO2 channel, respectively. Reactive uptake of these epoxides onto particles produces isoprene secondary organic aerosols (iSOA). Currently, there is little information regarding these two epoxides during iSOA formation in polluted regions. In this study, iSOA tracers from IEPOX and HMML were measured from summer to fall in the heavily polluted Pearl River Delta (PRD) region. The total concentration of the iSOA tracers ranged from 5.77 to 466 ng m−3. Isoprene SOA tracers correlated well with sulfate (p < 0.01), indicating that the abundant sulfate in the PRD plays an important role in iSOA formation. A kinetic model of IEPOX loss showed that 58% of IEPOX could undergo ring-opening reactions under the polluted PRD conditions in summer. This leads to high levels of IEPOX-derived SOA tracers in the PRD. High temperature in the PRD (>22 °C) suppresses the production of HMML, likely as a result of fast decomposition of HMML's precursor under high temperatures. Thus, the HMML-derived tracers had lower levels than the IEPOX-derived SOA tracers during the whole campaign. The ratios of the IEPOX-derived tracers to the HMML-derived SOA tracers in summer were ~3 times higher than those in fall. This seasonal trend may be explained by the relative high isoprene/NOx ratio, temperature, and fast heterogeneous reaction of IEPOX in summer. Our study shows that in highly polluted regions like PRD, reduction in SO2 emission can significantly reduce iSOA formation. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113529
Appears in Collections:气候减缓与适应

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作者单位: State Key Laboratory of Organic Geochemistry and Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China; Now at Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot, Israel; Southwest University of Science and Technology, Mianyang, China; University of Chinese Academy of Sciences, Beijing, China; Guangzhou Environmental Monitoring Center, Guangzhou, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China; Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot, Israel

Recommended Citation:
He Q.-F.,Ding X.,Fu X.-X.,et al. Secondary Organic Aerosol Formation From Isoprene Epoxides in the Pearl River Delta, South China: IEPOX- and HMML-Derived Tracers[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(13)
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