4.7 Article

The effect of COVID-19 restrictions on atmospheric new particle formation in Beijing

期刊

ATMOSPHERIC CHEMISTRY AND PHYSICS
卷 22, 期 18, 页码 12207-12220

出版社

COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/acp-22-12207-2022

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资金

  1. National Key R&D Program of China [2019YFC0214701, 2017YFC0209503, 2016YFC0200500]
  2. National Natural Science Foundation of China [91644213, 21925601, 41877306, 21876094]
  3. Beijing University of Chemical Technology
  4. Academy of Finland [1251427, 1139656, 296628, 306853, 316114, 311932]
  5. Finnish Centre of Excellence [1141135, 307331]
  6. EC Seventh Framework Programme
  7. European Union [895875, 742206, 850614]
  8. European Regional Development Fund
  9. Urban Innovative Actions initiative (HOPE: Healthy Outdoor Premises for Everyone) [UIA03-240]
  10. Business Finland [7517/31/2018]
  11. EU
  12. Academy of Finland Flagship [337549]
  13. Centre of Excellence of Inverse Modeling and Imaging, Academy of Finland [312125]
  14. Swiss National Science postdoc mobility grant [P2EZP2_18159]
  15. Finnish Academy of Science project [1325656]
  16. doctoral program in atmospheric sciences (ATM-DP, University of Helsinki)
  17. US NSF [AGS1801897]
  18. EC
  19. trans-national ERA-PLANET project SMURBS [689443]
  20. Marie Curie Actions (MSCA) [895875] Funding Source: Marie Curie Actions (MSCA)
  21. Academy of Finland (AKA) [306853, 312125, 306853, 312125] Funding Source: Academy of Finland (AKA)

向作者/读者索取更多资源

This study found that during lockdown, atmospheric new particle formation activity was mainly influenced by particle growth rates rather than traffic emissions. The clustering process was unaffected by traffic emissions, but an increase in particle growth rates enhanced new particle formation activity.
During the COVID-19 lockdown, the dramatic reduction of anthropogenic emissions provided a unique opportunity to investigate the effects of reduced anthropogenic activity and primary emissions on atmospheric chemical processes and the consequent formation of secondary pollutants. Here, we utilize comprehensive observations to examine the response of atmospheric new particle formation (NPF) to the changes in the atmospheric chemical cocktail. We find that the main clustering process was unaffected by the drastically reduced traffic emissions, and the formation rate of 1.5 nm particles remained unaltered. However, particle survival probability was enhanced due to an increased particle growth rate (GR) during the lockdown period, explaining the enhanced NPF activity in earlier studies. For GR at 1.5-3 nm, sulfuric acid (SA) was the main contributor at high temperatures, whilst there were unaccounted contributing vapors at low temperatures. For GR at 3-7 and 7-15 nm, oxygenated organic molecules (OOMs) played a major role. Surprisingly, OOM composition and volatility were insensitive to the large change of atmospheric NOx concentration; instead the associated high particle growth rates and high OOM concentration during the lockdown period were mostly caused by the enhanced atmospheric oxidative capacity. Overall, our findings suggest a limited role of traffic emissions in NPF.

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