Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China; Key Lab of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, Shanghai 200241, China.
Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China.
J Environ Sci (China). 2025 Mar;149:431-443. doi: 10.1016/j.jes.2024.01.018. Epub 2024 Jan 29.
To investigate the seasonal characteristics in air pollution in Chengdu, a single particle aerosol mass spectrometry was used to continuously observe atmospheric fine particulate matter during one-month periods in summer and winter, respectively. The results showed that, apart from O, the concentrations of other pollutants (CO, NO, SO, PM and PM) were significantly higher in winter than in summer. All single particle aerosols were divided into seven categories: biomass burning (BB), coal combustion (CC), Dust, vehicle emission (VE), K mixed with nitrate (K-NO), K mixed with sulfate and nitrate (K-SN), and K mixed with sulfate (K-SO) particles. The highest contributions in both seasons were VE particles (24%). The higher contributions of K-SO (16%) and K-NO (10%) particles occurred in summer and winter, respectively, as a result of their different formation mechanisms. S-containing (K-SO and K-SN), VE, and BB particles caused the evolution of pollution in both seasons, and they can be considered as targets for future pollution reduction. The mixing of primary sources particles (VE, Dust, CC, and BB) with secondary components was stronger in winter than in summer. In summer, as pollution worsens, the mixing of primary sources particles with 62 [NO] weakened, but the mixing with 97 [HSO] increased. However, in winter, the mixing state of particles did not exhibit an obvious evolution rules. The potential source areas in summer were mainly distributed in the southern region of Sichuan, while in winter, besides the southern region, the contribution of the western region cannot be ignored.
为了研究成都地区空气污染的季节性特征，本研究采用单颗粒气溶胶质谱仪，分别在夏季和冬季连续观测一个月大气细颗粒物。结果表明，除了 O 以外，其他污染物（CO、NO、SO、PM 和 PM）在冬季的浓度明显高于夏季。所有单颗粒气溶胶被分为七类：生物质燃烧（BB）、煤炭燃烧（CC）、尘、机动车排放（VE）、与硝酸盐混合的 K（K-NO）、与硫酸盐和硝酸盐混合的 K（K-SN）以及与硫酸盐混合的 K（K-SO）颗粒。在两个季节中，VE 颗粒的贡献最高（24%）。K-SO（16%）和 K-NO（10%）颗粒的贡献在夏季和冬季较高，这是由于它们不同的形成机制。含 S 物质（K-SO 和 K-SN）、VE 和 BB 颗粒导致了两个季节的污染演变，可以将它们视为未来污染减排的目标。冬季，与二次成分混合的一次源颗粒（VE、尘、CC 和 BB）比夏季更为强烈。在夏季，随着污染的加剧，一次源颗粒与 62 [NO]的混合减弱，但与 97 [HSO]的混合增强。然而，在冬季，颗粒的混合状态并没有表现出明显的演变规律。夏季的潜在源区主要分布在四川南部地区，而在冬季，除了南部地区外，西部地区的贡献也不容忽视。
