Title

Characterization of isoprene-derived secondary organic aerosols at a rural site in North China Plain with implications for anthropogenic pollution effects

Authors

Li, JJ; Wang, GH ; Wu, C (Wu, Can) ; Cao, C ; Ren, YQ; Wang, JY ; Li, J; Cao, JJ; Zeng, LM; Zhu, T

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 infuence of high concentrations of anthropogenic pollutants on isoprene-derived SOA (SOAi) formation, summertime PM2.5 flter samples were collected with a three-hour sampling interval at a rural site in the North China Plain (NCP), and determined for SOAi tracers and other chemical species. RO2+NO pathway derived 2-methylglyceric acid presented a relatively higher contribution to the SOAi due to the high-NOx (~20 ppb) conditions in the NCP that suppressed the reactive uptake of RO2+HO2 reaction derived isoprene epoxydiols. Compared to particle acidity and water content, sulfate plays a dominant role in the heterogeneous formation process of SOAi. Diurnal variation and correlation of 2-methyltetrols with ozone suggested an important efect of isoprene ozonolysis on SOAi formation.

SOAi increased linearly with levoglucosan during June 10–18, which can be attributed to an increasing emission of isoprene caused by the feld 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 infuenced by intensive anthropogenic activities in the NCP.

Corresponding author

Wang Gehui，Zhu Tong

Volume

8

Issue

Page

535

Pub year

2018

Publication name

SCIENTIFIC REPORTS

Details

https://www.nature.com/articles/s41598-017-18983-7