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Preprints
https://doi.org/10.5194/acp-2020-345
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-345
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  30 Apr 2020

30 Apr 2020

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A revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Probing key organic substances driving new particle growth initiated by iodine nucleation in coastal atmosphere

Yibei Wan1, Xiangpeng Huang2, Bin Jiang3, Binyu Kuang4, Manfei Lin4, Deming Xia5, Yuhong Liao3, Jingwen Chen5, Jianzhen Yu4, and Huan Yu1 Yibei Wan et al.
  • 1Department of Atmospheric Science, School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China
  • 2School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, 210044, China
  • 3Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
  • 4Department of Chemistry, Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China
  • 5School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China

Abstract. Unlike the deep understanding of highly oxygenated organic molecules (HOMs) driving continental new particle formation (NPF), little is known about the organics involved in coastal and open ocean NPF. On the coastline of China we observed intense coastal NPF events initiated by iodine nucleation, but particle growth to cloud condensation nuclei (CCN) sizes was dominated by organic compounds. This article revealed a new group of C18,30HhOoNn and C20,24,28,33HhOo compounds with specific double bond equivalents and oxygen atom numbers in sub-20 nm coastal iodine new particles by using ultrahigh resolution Fourier transform-ion cyclotron resonance mass spectrometry (FT-ICR-MS). We proposed these compounds are oxygenated or nitrated products of long chain unsaturated fatty acids, fatty alcohols, non-protein amino acids or amino alcohols emitted mutually with iodine from coastal biota or biological-active sea surface. Group contribution method estimated that the addition of −ONO2, −OH and −C = O groups to the precursors reduced their volatility of by 2~7 orders of magnitude and thus made their products condensable onto iodine new particles in the coastal atmosphere. Non-target MS analysis also provided a list of 440 formulas of iodinated organic compounds in size-resolved aerosol samples during the iodine NPF days, which facilitates the understanding of unknown aerosol chemistry of iodine.

Yibei Wan et al.

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Yibei Wan et al.

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Short summary
Biogenic iodine emission from macroalgae and microalgae could initiate atmospheric new particle formation (NPF). But it is unknown if other species are needed to drive the growth of iodine new particles in marine boundary layer. Unlike the deeper understanding of organic compounds driving continental NPF, little is known about the organics involved in coastal or open ocean NPF. This article reveals a new group of important organic compounds involved in this process.
Biogenic iodine emission from macroalgae and microalgae could initiate atmospheric new particle...
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