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The Concentrations, Formations, Relationships and Modeling of Sulfate, Nitrate and Ammonium (SNA) Aerosols over China

Category: Aerosol and Atmospheric Chemistry

Volume: 17 | Issue: 1 | Pages: 84-97
DOI: 10.4209/aaqr.2016.01.0020
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Zhaoyu Cao1, Xuehua Zhou 1, Yujie Ma1, Linpeng Wang1, Ruidong Wu1, Bing Chen 1, Wenxing Wang1,2

  • 1 Environment Research Institute, Shandong University, Shandong 250100, China
  • 2 Chinese Research Academy of Environment Science, Beijing 100012, China

Highlights

SO42–, NO3 and NH4+ are characterized in China based on published observation data.

SO42–, NO3 and NH4+ occupy 34.2 ± 10.9% of PM2.5 and 28.2 ± 8.5% of PM10.

Stationary source emissions of coal combustion are still dominated in China.

(NH4)2SO4 and NH4NO3 are the main existing forms of SO42–, NO3 and NH4+ in aerosols.

Sulfate levels simulated have an obvious underestimation in winter in northern China.


Abstract

Sulfate, nitrate and ammonium (SNA) are the dominant composition of secondary aerosols in the atmosphere and have a significant impact on public health, atmospheric chemistry process and climate. In this study, to evaluate SNA pollution in China, a first nationwide investigation derived from almost all published data in the field measurement before 2012 was carried out. The results show that SNA levels in China are about 3–5 times higher than those in USA and Europe. SNA account for 34.2 ± 10.9% in PM2.5 and 28.2 ± 8.5% in PM10. The highest SNA concentrations occur in urban areas of northern China. SNA all have peaks in winter, but the nadirs are in spring for sulfate and ammonium and in summer for nitrate. SOR (sulfur oxidation ratio) and NOR (nitrogen oxidation ratio) values show that the formations of sulfate and nitrate are distinct in different regions and seasons. The low average NO3/SO42– ratio (0.43 ± 0.26) indicates that the stationary emissions from coal combustion remain the main sources. There is a good relationship between (2[SO42–] + [NO3]) and [NH4+] with near 1 slope, signifying that (NH4)2SO4 and NH4NO3 are the predominant forms which SNA exist in particles in China. Based on the comprehensive observational data in China, the simulation for SNA aerosols by GISS in CMIP5 were evaluated.

Keywords

SNA Field measurement Model simulation China


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