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Chemical characterization of organic compounds involved in iodine-initiated new particle formation from coastal macro-algal emission
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  • Yibei Wan,
  • Xiangpeng Huang,
  • Chong Xing,
  • Qiongqiong Wang,
  • Xinlei Ge,
  • Huan Yu
Yibei Wan
China University of Geosciences, China University of Geosciences
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Xiangpeng Huang
Nanjing University of Information Science & Technology, Nanjing University of Information Science & Technology
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Chong Xing
China University of Geosciences, China University of Geosciences
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Qiongqiong Wang
The Hong Kong University of Science and Technology, The Hong Kong University of Science and Technology
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Xinlei Ge
Nanjing University of Information Science & Technology, Nanjing University of Information Science & Technology
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Huan Yu
China University of Geosciences, China University of Geosciences

Corresponding Author:[email protected]

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Abstract

Iodine-initiated new particle formation (I-NPF) has long been recognized in coastal hotspot regions. However, no prior work has studied the exact chemical composition of organic compounds and their role in the coastal I-NPF. Here we present an important complementary study to the ongoing laboratory and field researches of iodine nucleation in coastal atmosphere. Oxidation and NPF experiments with vapor emissions from real-world coastal macroalgae were simulated in a bag reactor. On the basis of comprehensive mass spectrometry measurements, we reported for the first time a series of volatile precursors and their oxidation products in gas and particle phases in such a highly complex system. Organic compounds overwhelmingly dominated over iodine in the new particle growth initiated by iodine species. The identity and transformation mechanisms of organic compounds were identified in this study to provide a more complete story of coastal NPF from low-tide macroalgal emission.