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<p>Organic nitrogen (ON) constitutes an important fraction of nitrogenous aerosols, impacting ecosystems, secondary organic aerosol formation, and biotoxicity. However, knowledge of aerosol ON levels and sources has remained largely unexplored. This study uses receptor modeling to apportion aerosol ON, based on bihourly measurements of ON and source-specific molecular and elemental markers at suburban Hong Kong during winter of 2020–2021. Aerosol ON averaged at 0.26 ± 0.09 μgN/m<sup>3</sup>, with comparable contributions from primary (54.0%) and secondary sources (46.0%). Bihourly resolution enabled observation of diurnal-scale dynamics of ON sources and formation chemistry, capturing short-term ON episodes. Biomass burning, α-pinene-related SOA formation, and sulfate-rich factors were dominant contributors during ON episodes. Fractional abundance of ON increased with humidity and temperature, reflecting the combined consequence on the formation of ON and gas-particle partitioning of inorganic nitrogen. Nighttime ON notably increased under high NO<sub><i>x</i></sub> levels, highlighting the role of NO<sub>3</sub> radical chemistry in secondary ON formation.</p>

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Molecular and elemental markers-based source apportionment of organic nitrogen in PM2.5 at a suburban site in Hong Kong

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月1日

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  • Jinjian Li,
  • Shan Wang,
  • Xu Yu,
  • Yuk Ying Cheng,
  • Hanzhe Chen,
  • Jian Zhen Yu

摘要

Organic nitrogen (ON) constitutes an important fraction of nitrogenous aerosols, impacting ecosystems, secondary organic aerosol formation, and biotoxicity. However, knowledge of aerosol ON levels and sources has remained largely unexplored. This study uses receptor modeling to apportion aerosol ON, based on bihourly measurements of ON and source-specific molecular and elemental markers at suburban Hong Kong during winter of 2020–2021. Aerosol ON averaged at 0.26 ± 0.09 μgN/m3, with comparable contributions from primary (54.0%) and secondary sources (46.0%). Bihourly resolution enabled observation of diurnal-scale dynamics of ON sources and formation chemistry, capturing short-term ON episodes. Biomass burning, α-pinene-related SOA formation, and sulfate-rich factors were dominant contributors during ON episodes. Fractional abundance of ON increased with humidity and temperature, reflecting the combined consequence on the formation of ON and gas-particle partitioning of inorganic nitrogen. Nighttime ON notably increased under high NOx levels, highlighting the role of NO3 radical chemistry in secondary ON formation.