Increase of High Molecular Weight Organosulfate With Intensifying Urban Air Pollution in the Megacity Beijing

Qiaorong Xie, Ying Li, Siyao Yue, Sihui Su, Dong Cao, Yisheng Xu, Jing Chen, Haijie Tong, Hang Su, Yafang Cheng, Wanyu Zhao, Wei Hu, Zhe Wang, Ting Yang, Xiaole Pan, Yele Sun, Zifa Wang, Cong Qiang Liu, Kimitaka Kawamura, Guibin JiangManabu Shiraiwa, Pingqing Fu

研究成果: Contribution to journalArticle

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Organosulfates (OSs), a key component of secondary organic aerosols (SOA), account for up to one third of organic matter in the atmosphere. However, high molecular weight (HMW, 500–800 Da) OSs in ambient aerosols are poorly characterized at a molecular level, due to experimental difficulties. With Fourier transform-ion cyclotron resonance mass spectrometry (FT-ICRMS), we are able to identify more than 8,000 OSs in wintertime aerosols in Beijing. We found that both the number and signal magnitudes of HMW OSs with low H/C and O/C ratios and degrees of unsaturation were greatly enhanced during hazy days, indicating that most HMW OSs were freshly formed during stagnant air pollution episodes. They are most likely to be the oxidation products of semivolatility to low-volatility precursors (e.g., polycyclic aromatic hydrocarbons and fatty acids) and have showed a strong influence of anthropogenic emissions. The molecular corridor analysis suggests that the high abundance of HMW aromatic-like and aliphatic OSs considerably decreases the volatility of organic aerosols in the urban atmosphere.

元の言語英語
記事番号e2019JD032200
ジャーナルJournal of Geophysical Research: Atmospheres
125
発行部数10
DOI
出版物ステータス出版済み - 5 27 2020
外部発表Yes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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    Xie, Q., Li, Y., Yue, S., Su, S., Cao, D., Xu, Y., Chen, J., Tong, H., Su, H., Cheng, Y., Zhao, W., Hu, W., Wang, Z., Yang, T., Pan, X., Sun, Y., Wang, Z., Liu, C. Q., Kawamura, K., ... Fu, P. (2020). Increase of High Molecular Weight Organosulfate With Intensifying Urban Air Pollution in the Megacity Beijing. Journal of Geophysical Research: Atmospheres, 125(10), [e2019JD032200]. https://doi.org/10.1029/2019JD032200