Geophysical Research Letters (Jul 2024)

Low Hygroscopicity of Newly Formed Particles on the North China Plain and Its Implications for Nanoparticle Growth

  • Juan Hong,
  • Jiamin Ma,
  • Nan Ma,
  • Jingnan Shi,
  • Wanyun Xu,
  • Gen Zhang,
  • Shaowen Zhu,
  • Shaobin Zhang,
  • Min Tang,
  • Xihao Pan,
  • Linhong Xie,
  • Guo Li,
  • Uwe Kuhn,
  • Chao Yan,
  • Ximeng Qi,
  • Qiaozhi Zha,
  • Wei Nie,
  • Jiangchuan Tao,
  • Yao He,
  • Yaqing Zhou,
  • Yele Sun,
  • Hanbing Xu,
  • Li Liu,
  • Runlong Cai,
  • Guangsheng Zhou,
  • Ye Kuang,
  • Bin Yuan,
  • Qiaoqiao Wang,
  • Tuukka Petäjä,
  • Veli‐Matti Kerminen,
  • Markku Kulmala,
  • Yafang Cheng,
  • Hang Su

DOI
https://doi.org/10.1029/2023GL107516
Journal volume & issue
Vol. 51, no. 14
pp. n/a – n/a

Abstract

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Abstract The growth of newly formed particles through new particle formation (NPF) contributes a significant fraction to the cloud condensation nuclei, yet the driving mechanisms remain unclear, especially for polluted environments. To investigate the potential species contributing for nanoparticle growth in environments with significant anthropogenic influences, we measured the hygroscopicity of newly formed particles at 20–40 nm at a rural observational site in the North China Plain during winter 2018. Our results demonstrate that these particles were not very hygroscopic, with the mean hygroscopicity parameter κ of 0.13 ± 0.09. Clear differences in the inferred κ of the growing material responsible for the growth were observed among different events, indicating that even at the same region, the compounds driving particle growth may not be identical. This may be synergistically influenced by the NPF precursors, oxidants and meteorological conditions, suggesting complex mechanisms might co‐exist behind nanoparticle growth in polluted environments.

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