Scholarlink

<p>Cross-regional transport significantly contributes to PM<sub>2.5</sub> sulfate (pSO<sub>4</sub>) in the Pearl River Delta, South China, but its underlying processes remain insufficiently understood. Using WRF/CMAQ simulations, we investigated the dynamics and chemistry of pSO<sub>4</sub> transport during a polluted month. Source apportionment indicates high transport contributions (76–88%) to pSO<sub>4</sub> during pollution episodes. Vertical exchange across the boundary-layer top was the primary pathway of pSO<sub>4</sub> import. Notably, strong exchange occurred in two contrasting episodes, which were separately dominated by persistent inflow from more polluted North and Central China and stagnation of polluted parcels. However, the chemical pathways of pSO<sub>4</sub> formation during transport differed in these episodes, shifting from gas-phase OH oxidation within cold, dry, oxidant-rich plumes to aqueous-phase H<sub>2</sub>O<sub>2</sub> oxidation within warm, humid plumes. These findings reveal the complex interplay between weather systems, boundary-layer dynamics and chemistry in cross-regional pSO<sub>4</sub> transport, offering new insights into pSO<sub>4</sub> pollution mechanism and future PM<sub>2.5</sub> mitigation.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Cross-regional PM2.5 sulfate transport to the Pearl River delta: dynamics and chemistry

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年3月6日

查看全文
  • Kun Qu,
  • Xuesong Wang,
  • Yu Yan,
  • Xipeng Jin,
  • Xuhui Cai,
  • Jin Shen,
  • Teng Xiao,
  • Manfei Yin,
  • Mihalis Vrekoussis,
  • Maria Kanakidou,
  • Guy P. Brasseur,
  • Limin Zeng,
  • Yuanhang Zhang

摘要

Cross-regional transport significantly contributes to PM2.5 sulfate (pSO4) in the Pearl River Delta, South China, but its underlying processes remain insufficiently understood. Using WRF/CMAQ simulations, we investigated the dynamics and chemistry of pSO4 transport during a polluted month. Source apportionment indicates high transport contributions (76–88%) to pSO4 during pollution episodes. Vertical exchange across the boundary-layer top was the primary pathway of pSO4 import. Notably, strong exchange occurred in two contrasting episodes, which were separately dominated by persistent inflow from more polluted North and Central China and stagnation of polluted parcels. However, the chemical pathways of pSO4 formation during transport differed in these episodes, shifting from gas-phase OH oxidation within cold, dry, oxidant-rich plumes to aqueous-phase H2O2 oxidation within warm, humid plumes. These findings reveal the complex interplay between weather systems, boundary-layer dynamics and chemistry in cross-regional pSO4 transport, offering new insights into pSO4 pollution mechanism and future PM2.5 mitigation.