Molecular Composition and Source Apportionment of Fine Organic Aerosols in Autumn in Changchun

被引：2

作者：

Wu X. ^{[1
,2
]}

Cao F. ^{[1
,2
]}

Zhai X.-Y. ^{[1
,2
]}

Fan M.-Y. ^{[1
,2
]}

Zhang S.-C. ^{[3
]}

Zhang Y.-L. ^{[1
,2
]}

机构：

[1] Yale-NUIST Center on Atmospheric Environment, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing

[2] Key Laboratory of Meteorological Disaster, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science & Technology, Nanjing

[3] Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun

来源：

Huanjing Kexue/Environmental Science | 2019年 / 40卷 / 08期

关键词：

Elemental carbon (EC); Non-polar organic compounds; Organic carbon (OC); PCA-MLR model; PM[!sub]2.5[!/sub; Source apportionment;

D O I：

10.13227/j.hjkx.201901031

中图分类号：

学科分类号：

摘要：

Organic aerosols have attracted increasing attention recently due to their significant contribution to fine particles (PM2.5) and their complex components and sources. In this study, a total of 40 PM2.5 samples were collected simultaneously with high-volume samplers in Changchun from 16th Oct to 29th Nov 2016. Organic carbon (OC), elemental carbon (EC), non-polar organic compounds including n-alkanes, polycyclic aromatic hydrocarbons (PAHs), and hopanes, and levoglucosan in atmospheric fine particles were analyzed. The main sources of organic aerosols were identified by molecular markers, diagnostic ratios, and a principal component analysis-multiple liner regression (PCA-MLR) model. The results showed that the average mass concentration of PM2.5was (79.0±55.7) μg•m-3, and the averaged OC and EC mass concentrations were (20.7±15.6) μg•m-3 and (2.2±1.1) μg•m-3, which accounted for 26.2% and 2.8% of PM2.5, respectively. The total average concentration of the tested non-polar organic compounds was (186.3±104.5) ng•m-3 and, in descending order, this was composed of n-alkane (101.3±67.0) ng•m-3, polycyclic aromatic hydrocarbons (81.4±46.0) ng•m-3, hopanes (3.8±1.9) ng•m-3. The PCA-MLR model results showed that the relative contributions of the main sources of organic aerosols were coal combustion (47.0%), biomass burning (42.6%), and traffic emission (10.4%). © 2019, Science Press. All right reserved.

引用

页码：3438 / 3446

页数：8

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