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Hygroscopicity of ambient submicron particles in urban Hangzhou, China |
Jiachen ZHANG1, Lin WANG1,2(), Jianmin CHEN1,2(), Shengmao FENG3, Jiandong SHEN3, Li JIAO3 |
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 |
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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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Keywords
hygroscopicity
hygroscopic tandem differential mobility analyzer (H-TDMA)
submicron ambient particles
Hangzhou
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Corresponding Author(s):
WANG Lin,Email:lin_wang@fudan.edu.cn; CHEN Jianmin,Email:jmchen@fudan.edu.cn
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Issue Date: 05 September 2011
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