Preprints
https://doi.org/10.5194/acp-2022-220
https://doi.org/10.5194/acp-2022-220
 
24 Mar 2022
24 Mar 2022
Status: a revised version of this preprint was accepted for the journal ACP.

Measurement Report: Effects of anthropogenic emissions and environmental factors on biogenic secondary organic aerosol (BSOA) formation in a coastal city of Southeastern China

Youwei Hong1,2,3,4, Xinbei Xu1,2,3, Dan Liao5, Taotao Liu1,2,3, Xiaoting Ji1,2,3, Ke Xu1,2,4, Chunyang Liao6, Ting Wang7, Chunshui Lin7, and Jinsheng Chen1,2,3 Youwei Hong et al.
  • 1Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
  • 2Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
  • 3University of Chinese Academy of Sciences, Beijing, 100049, China
  • 4School of Life Sciences, Hebei University, Baoding, 071000, China
  • 5College of Environment and Public Health, Xiamen Huaxia University, Xiamen 361024, China
  • 6State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
  • 7Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China

Abstract. To better understand the formation of biogenic secondary organic aerosol (BSOA), aerosol samples with a 4 h time resolution were collected during summer and wintertime in the southeast of China, along with on-line measurements of trace gases, aerosol chemical compositions, and meteorological parameters. The samples were analyzed by gas chromatography-mass spectrometry for PM2.5-bound SOA tracers, including isoprene (SOAI), α/β-pinene (SOAM), β-caryophyllene (SOAC), and toluene (ASOA). The average concentrations of total SOA tracers in winter and summer were 38.8 and 111.9 ng m−3, respectively, with the predominance of SOAM (70.1 % and 45.8 %), followed by SOAI (14.0 % and 45.6 %), ASOA (11.0 % and 6.2 %) and SOAC (4.9 % and 2.3 %). Compare to those in winter, the majority of BSOA tracers in summer showed significant positive correlations with Ox (O3+NO2), HONO, ultraviolet (UV) and temperature (T), indicating the influence of photochemical oxidation under relatively clean conditions. However, in winter, BSOA tracers were significantly correlated with PM2.5, NO3-, SO42-, and NH3, attributed to the contributions of anthropogenic emissions. Major BSOA tracers in both seasons was linearly correlated with aerosol acidity (pH), liquid water content (LWC) and SO42-. The results indicated that acid-catalyzed reactive uptake onto sulfate aerosol particles enhanced the formation of BSOA. In summer, the clean air mass originated from the ocean, and chlorine depletion was observed. We also found that concentrations of the total SOA tracers was correlated with HCl and chlorine ions in PM2.5, reflecting the contribution of Cl-initiated VOC oxidations to the formation of SOA. In winter, the northeast dominant wind direction brought continental polluted air mass to the monitoring site, affecting the transformation of BSOA tracers. This implied that anthropogenic emissions, atmospheric oxidation capacity and halogen chemistry have significant effects on the formation of BSOA in the southeast coastal area.

Youwei Hong et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-220', Anonymous Referee #1, 04 Apr 2022
  • RC2: 'Comment on acp-2022-220', Anonymous Referee #2, 18 Apr 2022
  • RC3: 'Comment on acp-2022-220', Anonymous Referee #3, 20 Apr 2022

Youwei Hong et al.

Data sets

Dataset for ACP by Hong et al., 2022 Hong, youwei https://doi.org/10.5281/zenodo.6376025

Youwei Hong et al.

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Short summary
Secondary organic aerosol (SOA) simulation remains uncertain, due to the unknown SOA formation mechanisms. Aerosol samples with a 4 h time resolution were collected, along with on-line measurements of aerosol chemical compositions and meteorological parameters. We found that anthropogenic emissions, atmospheric oxidation capacity and halogen chemistry have significant effects on the formation of biogenic SOA. The findings of this study are helpful to better explore the missed SOA sources.
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