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| An experimental study on aerosol hygroscopic properties during the summer in Beijing based on chemical composition |
| ZHANG Ze-yu1,2, WANG Tian-tian3, FAN Meng1, CHEN Liang-fu1, YU Chao1, JI Xuan-yu3, TAO Jin-hua1 |
1. State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, China Academy of Sciences, Beijing 100101, China;
2. School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
3. Jiangsu Provincial Environmental Monitoring Center, Nanjing 210019, China |
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Abstract With Aerosol Conditioning System (ACS1000), aethalometer (AE33) and gas chromatography/mass selective detector (GC/MSD), an experimental study on the atmospheric aerosol in Beijing was conducted from July 15 to August 4, 2019. There was a short-term air pollution process on July 27 and a strong precipitation on July 29 during the observation. This pollution process in Beijing was short and the concentrations of the pollutants changed dramatically. A continuously increasing tread of f(RH) was observed in the experiment, and the measurements indicated that the precipitation had a great impact on the f(RH). The average concentration of PM2.5 on July 27 was (92.54±47.05) μg/m3 with a dramatic variation. The average scattering enhancement factors for f(80%±1%) from July 28 to July 30 were (1.50±0.35), (1.43±0.36) and (1.48±0.25), respectively. Furthermore, the experimental data were used to develop a quantitative model between f(RH) and gf(RH) for estimating the hygroscopic growth factor gf(RH). The result of the f(RH)-gf(RH) relationship model showed a good performance, and its R2 could reach to 0.698.
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Received: 28 October 2019
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