广州市冬季一次典型臭氧污染过程分析

Translated title of the contribution: Analysis of a Typical Ozone Pollution Process in Guangzhou in Winter

Cheng Lei Pei, Yu Tong Xie, Xi Chen, Tao Zhang, Xiao Nuan Qiu, Yu Wang, Zai Hua Wang, Mei Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

This study focused on an ozone pollution event occurring in winter (January) in Guangzhou. Various influencing factors were analyzed, including various atmospheric trace gases, meteorological conditions during the whole pollution process, as well as the characteristics of the main O3 precursor volatile organic compounds (VOCs). The main sources of VOCs and the O3 formation regime were analyzed using an array of tools: the ozone potential formation (OFP), positive matrix factorization (PMF) model, and empirical kinetic modeling approach (EKMA) curve. Feasible strategies for O3 control were suggested. The results showed that O3 and NO2 exceeded the corresponding standards in this winter pollution event, when the concentrations of PM10 and PM2. 5 were also high, differing from the air pollution characteristics in summer and autumn. Low boundary layer height (< 75 m) and high atmospheric stability at night exacerbated the accumulation of ozone precursors and fine particles. Meteorological conditions such as the increased daytime temperature (5°C), stronger solar radiation (10%), and low horizontal wind speed (<1 m.s - 1 ) favored photochemical reactions and promoted the formation of ozone and fine particles. VOCs were mainly composed of alkanes, and the proportions of alkanes and alkynes in winter were higher than those in the other seasons. Aromatics (xylenes and toluene) and propylene were the key VOCs species leading to O3 formation. The main VOCs sources were vehicle exhaust (22. 4%), solvent usage (20. 5%), and industrial emissions (17. 9%); however, the source with highest OFP was identified as solvent usage. O3 formation in this event was in the VOCs-limited regime, and reducing O3 precursors in the VOCs/NOx ratio of 3: 1 was effective and feasible for O3 control. This study explored the causes of an O3 pollution event in winter, which will serve as reference for the synergistic control of O3 and PM2. 5 in heavy pollution seasons.

Translated title of the contributionAnalysis of a Typical Ozone Pollution Process in Guangzhou in Winter
Original languageChinese (Simplified)
Pages (from-to)4305-4315
Number of pages11
JournalHuanjing Kexue/Environmental Science
Volume43
Issue number10
DOIs
Publication statusPublished - Oct 2022
Externally publishedYes

Keywords

  • Guangzhou
  • ozone (O )
  • pollution process
  • positive matrix factorization (PMF)
  • volatile organic compounds (VOCs)

ASJC Scopus subject areas

  • Environmental Science(all)

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