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Chemical and Optical Properties of Atmospheric Aerosols during the Polluted Periods in a Megacity in the Yangtze River Delta, China

Category: Aerosol and Atmospheric Chemistry

Accepted Manuscripts
DOI: 10.4209/aaqr.2017.12.0572
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Xingna Yu 1,2, Li Shen1, Sihan Xiao1, Jia Ma3, Rui Lü1, Bin Zhu1, Jianlin Hu1, Kui Chen1, Jun Zhu1

  • 1 Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Joint International Research Laboratory of Climate and Environment Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD)/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing 210044, China
  • 2 Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Shanghai 200433, China
  • 3 Guangzhou Hexin Analytical Instrument Company Limited, Guangzhou 510530, China

Highlights

Aerosol chemical and optical properties were observed in Nanjing.
Secondary formation dominated PM2.5 pollution were discussed.
Contributions of aerosol chemical components to light extinction were quantified.


Abstract

The chemical composition and optical properties of particulate matter (PM) were characterized at an urban-industrial area of Nanjing, China in January 2015 when heavily polluted periods frequently occurred. Only 30% of days met the National Ambient Air Quality Standards of China. The average scattering and absorption coefficients at 532 nm during the polluted periods were 620 ± 320 Mm–1 and 102 ± 57 Mm–1. An increasing relative fraction of large size PM during the polluted periods can be deduced from the variations of scattering Ångström exponent, backscattering ratio, and asymmetry factor. The mean mass concentration of NO3, SO42– and NH4+ in PM2.5 during the polluted periods were 32.87± 17.76 µg m–3, 23.6 ± 13.2 µg m–3, and 19.4 ± 10.1 µg m–3, respectively. NO3, SO42– and NH4+ were the dominant water-soluble ions (WSIs) and accounted for 87% of the total ion concentrations. Nitrate and organic matter (OM) dominated the aerosol composition during the polluted periods. The averaged organic carbon/elementary carbon ratios during the polluted and cleaner periods were 3.6 and 4.3 respectively, consistent with a mix of primary emissions and secondary organic aerosol formation. Organic matter and ammonium nitrate (AN) were the dominant species contributing to light extinction during the polluted periods, and the values of light extinction contributed by OM and AN were 159 ± 63 Mm–1 and 156 ± 91 Mm–1, respectively.

Keywords

Air pollution Aerosol chemical composition Aerosol optical properties Atmospheric extinction


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