Seasonal variations, temperature dependence, and sources of size-resolved PM components in Nanjing, east China

相对湿度 微粒 总有机碳 环境化学 无机离子 化学 质量浓度(化学) 环境科学 气溶胶 空气质量指数 大气科学 离子 气象学 地理 有机化学 物理化学 地质学
作者
Mingjie Xie,Wei Feng,Siyue He,Qin’geng Wang
出处
期刊:Journal of Environmental Sciences-china [Elsevier BV]
卷期号:121: 175-186 被引量:5
标识
DOI:10.1016/j.jes.2021.12.022
摘要

Size-segregated ambient particulate matter (PM) samples were collected seasonally in suburban Nanjing of east China from 2016 to 2017 and chemically speciated. In both fine (< 2.1 µm, PM2.1) and coarse (> 2.1 µm, PM>2.1) PM, organic carbon (OC) accounted for the highest fractions (26.9% ± 10.9% and 23.1% ± 9.35%) of all measured species, and NO3- lead in average concentrations of water-soluble inorganic ions (WSIIs). The size distributions of measured components were parameterized using geometric mean diameter (GMD). GMD values of NO3-, Cl-, OC, and PM for the whole size range varied from < 2.1 µm in winter to > 2.1 μm in warm seasons, which was due to the fact that the size distributions of semi-volatile components (e.g., NH4NO3, NH4Cl, and OC) had a dependency on the ambient temperature. Unlike OC, elemental carbon (EC), and elements, NH4+, NO3-, and SO42- exhibited an increase trend in GMD values with relative humidity, indicating that the hygroscopic growth might also play a role in driving seasonal changes of PM size distributions. Positive matrix factorization was performed using compositional data of fine and coarse particles, respectively. The secondary formation of inorganic salts contributing to the majority (> 70%) of fine PM and 20.2% ± 19.9% of speciated coarse PM. The remaining coarse PM content was attributed to a variety of dust sources. Considering that coarse and fine PM had comparable mass concentrations, more attention should be paid to local dust emissions in future air quality plans.
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