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| Single-particle chemical characterization of aerosols at the Heshan atmospheric supersite during the dry season |
| JIANG Bin1,2, CHEN Duo-hong2, WANG Bo-guang1, ZHANG Tao2, LI Mei1, GAN Ting1, ZHOU Yan2, ZHONG Liu-ju2, BI Xin-hui3 |
1. Institute of Technology on Atmospheric Environmental Safety and Pollution Control, Jinan University, Guangzhou 510632, China;
2. State Environmental Protection Key Laboratory of Regional Air Quality Monitoring, Guangdong Environmental Monitoring Center, Guangzhou 510308, China;
3. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China |
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Abstract Single-particle chemical characteristics of atmospheric aerosols were studied by a single-particle aerosol mass spectrometry (SPAMS) at the Heshan atmospheric supersite of Guangdong in the dry season (November 4 to December 30) in 2013. Over 1.6 × 106 fine particles were characterized by the SPAMS with the ART-2a neural network algorithms. All the particles were classified into 9 main categories: elemental carbon (EC)-Fresh, EC-Nitrate/Sulfate, K-EC, Ca-EC, internally mixed elemental-organic carbon (ECOC), organic carbon (OC)-Levoglucosan, OC-Nitrate/Sulfate, K-Nitrate/Sulfate and Metal-rich particles. Results showed that those particles rich in secondary water soluble ions, like EC-Nitrate/Sulfate, K-Nitrate/Sulfate particles, were enhanced in hazy days at Heshan supersite during the measurement campaign. Furthermore, secondary organic components more favored partitioning to particle phase in sunny days. In rainy days, however, there were more EC-fresh particles and K-EC particles which likely were influenced by local emissions. Finally, EC-Nitrate/Sulfate particles may have a vital role on the formation of haze as they had a good correlation with visibility.
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Received: 30 August 2015
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