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<p>Surface ozone pollution, a major threat to ecosystems and human health, can be exacerbated by interactions between anthropogenic and biogenic emissions. Here we combine field observations with numerical models to reveal a previously unrecognized pathway that intensifies ozone pollution: urban expansion fragments forests, forming Urban-Forest-Urban plumes that trigger cascading ozone production. In South China, five-year observations show ozone levels in Urban-Forest-Urban plumes are 35%–105% higher than in other plume types during hot seasons. Urban pollutants infiltrating forests elevate atmospheric oxidation capacity, accelerating biogenic volatile organic compounds oxidation and boosting their ozone contribution by up to twelvefold. The resulting long-lived oxygenated volatile organic compounds are transported downwind and further react with urban nitrogen oxides, enhancing ozone production. This mechanism shows strong temperature dependence, with up to 10% more ozone per 1 °C warming, underscoring its growing significance under climate change.</p><p></p>

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Landscape fragmentation triggers cascading enhancement of surface ozone production

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年11月19日

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  • Jiangyong Li,
  • Hao Wang,
  • Daocheng Gong,
  • Qinqin Li,
  • Yu Wang,
  • Wenlong Zhao,
  • Chunlin Zhang,
  • Zihan Zhou,
  • Yiming Zhao,
  • Qiao Xu,
  • Yan Zhou,
  • Congrong He,
  • Zoran Ristovski,
  • Lidia Morawska,
  • Shaw Chen Liu,
  • Boguang Wang

摘要

Surface ozone pollution, a major threat to ecosystems and human health, can be exacerbated by interactions between anthropogenic and biogenic emissions. Here we combine field observations with numerical models to reveal a previously unrecognized pathway that intensifies ozone pollution: urban expansion fragments forests, forming Urban-Forest-Urban plumes that trigger cascading ozone production. In South China, five-year observations show ozone levels in Urban-Forest-Urban plumes are 35%–105% higher than in other plume types during hot seasons. Urban pollutants infiltrating forests elevate atmospheric oxidation capacity, accelerating biogenic volatile organic compounds oxidation and boosting their ozone contribution by up to twelvefold. The resulting long-lived oxygenated volatile organic compounds are transported downwind and further react with urban nitrogen oxides, enhancing ozone production. This mechanism shows strong temperature dependence, with up to 10% more ozone per 1 °C warming, underscoring its growing significance under climate change.