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Hygroscopicity of ambient submicron particles in urban Hangzhou, China
Authors:Jiachen Zhang  Lin Wang  Jianmin Chen  Shengmao Feng  Jiandong Shen  Li Jiao
Institution:1. Department of Environmental Science & Engineering, Fudan University, Shanghai, 200433, China
2. Research Institute for the Changing Global Environment, Fudan University, Shanghai, 200433, China
3. Central Station of Environmental Monitoring, Hangzhou Environmental Protection Bureau, Hangzhou, 310012, China
Abstract:In this study, hygroscopicity of size-segregated ambient submicron particles in urban Hangzhou was studied from 28th December 2009 to 18th January 2010, using a hygroscopicity-tandem differential mobility analyzer (H-TDMA). The submicron particles in Hangzhou showed a minor hygroscopic growth at 73% relative humidity (RH), and then grew significantly between 77% and 82% RH. Monomodal distribution accounted for 90% for 30 nm particles, 17% for 50 nm particles, and less than 7% for particles larger than 50 nm at 82% RH. Deconvolution of the bimodal distribution indicated a less hygroscopic group and a more hygroscopic group, with the fraction of the more hygroscopic group increasing with the initial dry particle size and then remaining almost constant for accumulation mode particles. Our results imply that submicron particles in urban Hangzhou were almost entirely externally mixed, and the hygroscopic properties of ambient particles in urban Hangzhou were mainly a function of their size and chemical composition.
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