Science in China Series D: Earth Sciences

, Volume 51, Issue 9, pp 1354–1360

Study of ozone “weekend effect” in Shanghai

  • WenYuan Tang
  • ChunSheng Zhao
  • FuHai Geng
  • Li Peng
  • GuangQiang Zhou
  • Wei Gao
  • JianMing Xu
  • XueXi Tie


Analysis of observed ozone data in 2006 from five monitoring sites (Xujiahui, Chongming, Baoshan, Pudong, Jinshan) in Shanghai reveals that ozone (O3) concentrations in Xujiahui are higher at weekends than those on weekdays, despite the fact that emissions of ozone precursor substances, such as oxides of nitrogen (NOx), carbon monoxide (CO) and volatile organic compounds (VOCs) are lower at weekends than those on weekdays. The possible chemical cause of ozone “weekend effect” is that NO2/NO ratio increases at weekends by 25.61% compared with those on weekdays. In addition, because of an average 12.13% reduction in NOx (NO + NO2) in the early morning (05:00–09:00) at weekends compared with that on weekdays, the ozone inhibition period ends 0.5 h earlier at weekends resulting in the longer duration of ozone accumulation and the higher ozone production rate. The rate of ozone production is a function of VOCs and NOx in the atmosphere. VOCs/NOx ratio in Xujiahui is 4.55 at weekends, and 4.37 on weekdays, belonging to the “NOx-limited”. The increasing VOCs/NOx ratio at weekends leads to ozone enhancement from 73 ppbv to 80 ppbv, which are consistent with ozone “weekend effect” in Xujiahui. Furthermore, combining with MICAPS cloud amount data, the fact that ozone “weekend effect” in Xujiahui weakens gradually along with the increasing of cloud amount indicates that ozone photochemical production leads to ozone “weekend effect” in Xujiahui of Shanghai.


Shanghai ozone photochemical pollution “weekend effect” 


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Copyright information

© Science in China Press and Springer-Verlag GmbH 2008

Authors and Affiliations

  • WenYuan Tang
    • 1
  • ChunSheng Zhao
    • 1
  • FuHai Geng
    • 1
    • 2
  • Li Peng
    • 2
  • GuangQiang Zhou
    • 2
  • Wei Gao
    • 2
  • JianMing Xu
    • 2
  • XueXi Tie
    • 2
    • 3
  1. 1.Department of Atmospheric Science, School of PhysicsPeking UniversityBeijingChina
  2. 2.Atmospheric Chemistry Laboratory of Shanghai Meteorological BureauShanghaiChina
  3. 3.Atmospheric Chemistry DivisionNCARBoulderUSA

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