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Characteristics and Formation Mechanism of Surface Ozone in a Coastal Island of Southeast China: Influence of Sea-land Breezes and Regional Transport

Category: Urban Air Quality

Volume: 19 | Issue: 8 | Pages: 1734-1748
DOI: 10.4209/aaqr.2019.04.0193
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Baoye Hu1,2,3, Taotao Liu1,2,3, Yuxiang Yang4, Youwei Hong 1,2, Mengren Li1,2, Lingling Xu1,2, Hong Wang5, Naihua Chen4, Xin Wu1,2,3, Jinsheng Chen 1,2

  • 1 Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
  • 2 Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
  • 3 University of Chinese Academy of Sciences, Beijing 100086, China
  • 4 Pingtan Environmental Monitoring Center of Fujian, Pingtan 350400, China
  • 5 Fujian Meteorological Science Institute, Fuzhou 350001, China

Highlights

  • Spatiotemporal variations in O3 on an island in Southeast China were investigated.
  • The effects of sea and land breeze on O3 distribution were studied.
  • Regional contributions to O3 pollution were revealed by PSCF.

Abstract

The ozone (O3) concentrations in island cities are low due to the relatively low concentrations of O3 precursors. However, Pingtan, a typical island city along the southeast coast of China, suffers from frequent O3 pollution. In this study, one year of hourly O3 concentration data collected from three sites (rural, suburban, and urban) on Pingtan were used to investigate the characteristics and formation mechanism of O3 pollution. The results showed that the minimum O3 concentrations measured at the three sites were larger than 55.53 µg m–3, which was likely caused by low NO titration over Pingtan. The O3 concentrations in summer were low because of the East Asian monsoon. The daily maximum O3 concentrations with sea and land breezes (SLBs) were higher than those without SLBs at all three sites (8.52, 9.84, and 14.30 µg m–3 at the rural, suburban, and urban sites, respectively). In addition, SLBs amplified the diurnal variation in O3 concentrations. Cluster analysis and the analysis of an episode of high O3 concentration indicated that the developed Yangtze River Delta is the main source of O3 in Pingtan. This study helps reveal the characteristics and formation mechanism of O3 pollution in island cities.

Keywords

Ozone (O3) Spatiotemporal variation Transport Sea and land breezes Island


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