| Title: | Characterization of isoprene-derived secondary organic aerosols at a rural site in North China Plain with implications for anthropogenic pollution effects |
| Author(s): | Li J; Wang G; Wu C; Cao C; Ren Y; Wang J; Li J; Cao J; Zeng L; Zhu T; |
| Address: | "State Key Laboratory of Loess and Quaternary Geology, Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China. State Key Laboratory of Loess and Quaternary Geology, Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China. wanggh@ieecas.cn. Key Laboratory of Geoscience Information of the Ministry of Education, School of Geographic Sciences, East China Normal University, Shanghai, China. wanggh@ieecas.cn. Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China. wanggh@ieecas.cn. University of Chinese Academy of Sciences, Beijing, China. wanggh@ieecas.cn. University of Chinese Academy of Sciences, Beijing, China. BIC-ESAT and SKL-ESPC, College of Environmental Sciences and Engineering, Peking University, Beijing, China. BIC-ESAT and SKL-ESPC, College of Environmental Sciences and Engineering, Peking University, Beijing, China. tzhu@pku.edu.cn" |
| DOI: | 10.1038/s41598-017-18983-7 |
| ISSN/ISBN: | 2045-2322 (Electronic) 2045-2322 (Linking) |
| Abstract: | "Isoprene is the most abundant non-methane volatile organic compound (VOC) and the largest contributor to secondary organic aerosol (SOA) burden on a global scale. In order to examine the influence of high concentrations of anthropogenic pollutants on isoprene-derived SOA (SOA (i) ) formation, summertime PM(2.5) filter samples were collected with a three-hour sampling interval at a rural site in the North China Plain (NCP), and determined for SOA (i) tracers and other chemical species. RO(2)+NO pathway derived 2-methylglyceric acid presented a relatively higher contribution to the SOA (i) due to the high-NOx (~20 ppb) conditions in the NCP that suppressed the reactive uptake of RO(2)+HO(2) reaction derived isoprene epoxydiols. Compared to particle acidity and water content, sulfate plays a dominant role in the heterogeneous formation process of SOA (i) . Diurnal variation and correlation of 2-methyltetrols with ozone suggested an important effect of isoprene ozonolysis on SOA (i) formation. SOA (i) increased linearly with levoglucosan during June 10-18, which can be attributed to an increasing emission of isoprene caused by the field burning of wheat straw and a favorable aqueous SOA formation during the aging process of the biomass burning plume. Our results suggested that isoprene oxidation is highly influenced by intensive anthropogenic activities in the NCP" |
| Keywords: | "Aerosols/adverse effects/*chemistry Biomass Butadienes/adverse effects/*chemistry China Crops, Agricultural/*drug effects Environmental Pollutants/adverse effects/*chemistry Hemiterpenes/adverse effects/*chemistry Oxidation-Reduction Pentanes/adverse effe;" |
| Notes: | "MedlineLi, Jianjun Wang, Gehui Wu, Can Cao, Cong Ren, Yanqin Wang, Jiayuan Li, Jin Cao, Junji Zeng, Limin Zhu, Tong eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. England 2018/01/13 Sci Rep. 2018 Jan 11; 8(1):535. doi: 10.1038/s41598-017-18983-7" |
