为探讨成都市空气污染的季节特征,在夏季和冬季的一个月内,使用单粒子气溶胶质谱法连续观测大气细颗粒物,分别。结果表明,除O3外,其他污染物的浓度(CO,NO2、SO2、PM2.5和PM10)冬季明显高于夏季。所有单颗粒气溶胶分为七类:生物质燃烧(BB),煤燃烧(CC),灰尘,车辆排放(VE),K与硝酸盐(K-NO3)混合,K与硫酸盐和硝酸盐混合(K-SN),和K与硫酸盐(K-SO4)颗粒混合。两个季节的贡献最高的是VE颗粒(24%)。K-SO4(16%)和K-NO3(10%)颗粒的贡献较高发生在夏季和冬季,分别,由于它们的形成机制不同。含S(K-SO4和K-SN),VE,BB颗粒导致了两个季节的污染演变,它们可以被视为未来减少污染的目标。初级源颗粒的混合(VE,灰尘,CC,和BB),次要成分在冬季比夏季强。在夏天,随着污染的恶化,初级源颗粒与62[NO3]的混合-弱化,但与97[HSO4]的混合增加。然而,在冬天,粒子的混合状态没有表现出明显的演化规律。夏季潜在源区主要分布在川南地区,而在冬天,除了南部地区,西部地区的贡献不容忽视。
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 O3, the concentrations of other pollutants (CO, NO2, SO2, PM2.5 and PM10) 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-NO3), K mixed with sulfate and nitrate (K-SN), and K mixed with sulfate (K-SO4) particles. The highest contributions in both seasons were VE particles (24%). The higher contributions of K-SO4 (16%) and K-NO3 (10%) particles occurred in summer and winter, respectively, as a result of their different formation mechanisms. S-containing (K-SO4 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 [NO3]- weakened, but the mixing with 97 [HSO4]- 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.