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Particle Liquid Water Content and Aerosol Acidity Acting as Indicators of Aerosol Activation Changes in Cloud Condensation Nuclei (CCN) during Pollution Eruption in Guangzhou of South China

Category: Aerosol and Atmospheric Chemistry

Volume: 19 | Issue: 12 | Pages: 2662-2670
DOI: 10.4209/aaqr.2019.09.0476
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To cite this article:
Duan, J., Lyu, R., Wang, Y., Xie, X., Wu, Y., Tao, J., Cheng, T., Liu, Y., Peng, Y., Zhang, R., He, Q., Ga, W., Zhang, X. and Zhang, Q. (2019). Particle Liquid Water Content and Aerosol Acidity Acting as Indicators of Aerosol Activation Changes in Cloud Condensation Nuclei (CCN) during Pollution Eruption in Guangzhou of South China. Aerosol Air Qual. Res. 19: 2662-2670. doi: 10.4209/aaqr.2019.09.0476.

Junyan Duan1, Rui Lyu1, Yanyu Wang1, Xin Xie1, Yunfei Wu2, Jun Tao3, Tiantao Cheng 4,5, Yuehui Liu1, Yarong Peng1, Renjian Zhang 2, Qianshan He6, Wei Ga6, Xianming Zhang7, Qian Zhang7

  • 1 Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China
  • 2 Key Laboratory of Region Climate-Environment Research for Temperate East Asia (TEA), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
  • 3 South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou 510655, China
  • 4 Department of Atmospheric and Oceanic Sciences and Institute of Atmospheric Sciences, Fudan University, Shanghai 200438, China
  • 5 Institute of Eco-Chongming (SIEC), Shanghai 200062, China
  • 6 Shanghai Meteorological Bureau, Shanghai 200030, China
  • 7 Wireless Product R&D Institute, ZTE Corporation, Shenzhen 518057, China

Highlights

  • Aerosol pH and CCN increase rapidly with PM2.5 during pollution outbreak.
  • Aerosol CCN activity varies synchronously with water species and water content.
  • A possible approach to track aerosol activation changes during pollution eruption.

Abstract

Atmospheric pollution has been found to modify the hygroscopicity of particles and the ability of aerosols to become cloud condensation nuclei (CCN). Aerosols and the bulk CCN were measured in urban Guangzhou during pollution periods in January 2016, and the particle liquid water content (PLWC) and aerosol acidity (Aero-pH) were calculated to examine their possible effects on aerosols’ CCN activation. The results demonstrate that the PLWC and Aero-pH likely play key roles in enhancing aerosol activation during the early stages of pollution episodes. The analysis of the calculated and the observed data shows that CCN, PLWC, Aero-pH and water-soluble inorganic matter (WSIM) are closely linked to each other, particularly at night, and Aero-pH and PLWC act as pre-occurring indicators of activated aerosols and aerosol activity, respectively, during the rapid onset of pollution. In theory, the feedback between chemical reactions, aerosol acidity and particle water content accounts for the changes in aerosol activation accompanying particle accumulation and aging. Our research provides insights into the swift formation of particle pollution characterized by secondary aerosols and suggests a possible approach to tracking or characterizing its effects on the activation of aerosols into CCN without requiring CCN or aerosol number measurements.

Keywords

Aerosol acidity Particle water content CCN Pollution


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