An Observational Study of the Hygroscopic Properties of Aerosols over the Pearl River Delta Region
- 作者：Haobo TanYan YinXuesong GuFei LiP.W.ChanHanbing XuXuejiao DengQilin Wan
- 会议时间：2014-09-10
- 关键词：H-TDMA ; aerosol hygroscopicity ; urban aerosol ; haze ; Pearl River Delta
- 作者单位：Haobo Tan(Key Laboratory for Aerosol-cloud-precipitation of China Meteorological Administration,Nanjing University of Information Science and Technology, Nanjing 210044, China; Key Laboratory of Regional Numerical Weather Prediction,Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou,Guangdong 510080, China)Yan Yin,Xuesong Gu(Key Laboratory for Aerosol-cloud-precipitation of China Meteorological Administration,Nanjing University of Information Science and Technology, Nanjing 210044, China)Fei Li,Xuejiao Deng,Qilin Wan(Key Laboratory of Regional Numerical Weather Prediction,Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou,Guangdong 510080, China)P.W.Chan(Hong Kong Observatory, Hong Kong, China)Hanbing Xu(Experimental Teaching Center, Sun Yat-sen University, Guangzhou 510275, China)
- 母体文献：第八届全国优秀青年气象科技工作者学术研讨会论文集
- 会议名称：第八届全国优秀青年气象科技工作者学术研讨会
- 会议地点：江苏宜兴
- 主办单位：中国气象学会
- 语种：chi
摘要
Hygroscopic growth can significantly affect size distribution and activation of aerosol particles, as well as their effects on human health, atmospheric visibility, and climate.In this study, a H-TDMA (Hygroscopic Tandem Differential Mobility Analyzer) was utilized to measure hygroscopic growth factor and mixing state of aerosol particles at the CAWNET station in Panyu, Guangzhou, China.A statistical analysis of the results show that, at relative humidity (RH) of 90%, for less-hygroscopic particles of 40-200 nm in diameter, the growth factor (gLH) was around 1.13, while the number fraction (NFLH) varied between 0.41±0.136 and 0.26±0.078; for more-hygroscopic particles, the growth factor (gMH) varied between 1.46 and 1.55 with the average equivalent ammonium sulfate ratio (εAS) ranging from 0.63 to 0.68.The differences in εAS among particle of different sizes reveal that more-hygroscopic inorganic salts, such as ammonium sulfate and ammonium nitrate, are of more effective condensation growth for Aitken mode particles.A combined analysis of the probability density function of growth factor (Gf-PDF) and simultaneous meteorological data shows that during clean periods with air masses moving from the north, the particles are more likely to have homogeneous chemical composition, while during polluted or pollution accumulation periods, variations in mean number weighted growth factor (gmean) and NFMH become more pronounced, indicating that locally-emitted aerosol particles tend to be in an externally mixed state and contain a certain proportion of less-hygroscopic particles.This study can help improve our understanding of aerosol hygroscopicity and its impact on the atmospheric visibility and environment.