Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-446
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
12 Jun 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
Chemical characterization and synergetic source apportionment of PM2.5 at multiple sites in the Beijing–Tianjin–Hebei region, China
Xiaojuan Huang1,2, Zirui Liu1,3, Jingyun Liu1, Bo Hu1, Tianxue Wen1, Guiqian Tang1, Junke Zhang1, Fangkun Wu1, Dongsheng Ji1, Lili Wang1, and Yuesi Wang1,3 1State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
2Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, College of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu, China
3Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China
Abstract. High frequencies of haze in China, especially in the Beijing–Tianjin–Hebei region, have received widespread attention in recent years. In this study, samples of filtered atmospheric fine particulate matter (PM2.5) were collected synchronously at three urban sites (Beijing, Tianjin, and Shijiazhuang) and at a regional background site (Xinglong) for one month during each season from June 2014 to April 2015. Chemical composition determination/analysis, chemical mass closure, positive matrix factorization (PMF) and backward trajectory clustering were employed to investigate the chemical speciation, haze formation mechanism, emission sources, and influences of regional transport in North China. Our results reported that the aerosol chemical compositions were very similar at the urban sites and the background site and mainly comprised organic matter (16.0 %–25.0 %), sulfate (14.4 %–20.5 %), nitrate (15.1 %–19.5 %), ammonium (11.6 %–13.1 %) and mineral dust (14.7 %–20.8 %). Sources apportionment of PM2.5 by PMF model revealed that secondary aerosols (background) and secondary inorganic aerosols (urban) were the dominant sources, which accounted for 29.2 %–45.1 % of PM2.5 throughout the entire study and played a vital role in the formation and development of haze pollution. Emissions of motor vehicle exhaust exerted a significant impact on haze formation at urban sites, particularly at Beijing; and coal combustion also played an dominant role in winter, especially at Shijiazhuang. Backward trajectory analysis revealed that haze pollution has remarkable regional characteristics and usually occurs when air masses originated from polluted industrial regions of the south prevailed, which accompanied by high PM2.5 loadings with high contributions of secondary aerosols. This study suggests that the control strategies to mitigate the haze formation in BTH region should be focused on the emission reduction of gaseous precursors from fossil fuel combustion, particularly from motor vehicles by improving the quality of oil products.

Citation: Huang, X., Liu, Z., Liu, J., Hu, B., Wen, T., Tang, G., Zhang, J., Wu, F., Ji, D., Wang, L., and Wang, Y.: Chemical characterization and synergetic source apportionment of PM2.5 at multiple sites in the Beijing–Tianjin–Hebei region, China, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-446, in review, 2017.
Xiaojuan Huang et al.
Xiaojuan Huang et al.
Xiaojuan Huang et al.

Viewed

Total article views: 450 (including HTML, PDF, and XML)

HTML PDF XML Total Supplement BibTeX EndNote
312 130 8 450 17 2 9

Views and downloads (calculated since 12 Jun 2017)

Cumulative views and downloads (calculated since 12 Jun 2017)

Viewed (geographical distribution)

Total article views: 450 (including HTML, PDF, and XML)

Thereof 450 with geography defined and 0 with unknown origin.

Country # Views %
  • 1

Saved

Discussed

Latest update: 22 Aug 2017
Publications Copernicus
Download
Short summary
Recently, haze pollution frequently occurs in North China. Therefore, we conducted the measurement of PM2.5 synchronously for one year to investigate the haze formation mechanism, sources and influences of regional transport. The results revealed that secondary aerosols, coal combustion and motor vehicle exhaust exerted significant impacts on urban haze formation. And the mitigation strategies of reduction of gaseous precursors emitted from fossil fuel combustion was suggested.
Recently, haze pollution frequently occurs in North China. Therefore, we conducted the...
Share