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Particle Hygroscopicity and Its Link to Chemical Composition in the Urban Atmosphere of Beijing, China During Summertime : Volume 15, Issue 8 (20/04/2015)

By Wu, Z. J.

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Book Id: WPLBN0003977167
Format Type: PDF Article :
File Size: Pages 30
Reproduction Date: 2015

Title: Particle Hygroscopicity and Its Link to Chemical Composition in the Urban Atmosphere of Beijing, China During Summertime : Volume 15, Issue 8 (20/04/2015)  
Author: Wu, Z. J.
Volume: Vol. 15, Issue 8
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Wu, Z. J., Wu, Y. S., Wiedensohler, A., Hu, M., Zheng, J., Du, Z. F.,...Zeng, L. M. (2015). Particle Hygroscopicity and Its Link to Chemical Composition in the Urban Atmosphere of Beijing, China During Summertime : Volume 15, Issue 8 (20/04/2015). Retrieved from

Description: State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China. Simultaneous measurements of particle number size distribution, particle hygroscopic properties, and size-resolved chemical composition were made during the summer of 2014 in Beijing, China. During the measurement period, the median hygroscopicity parameters (κ) of 50, 100, 150, 200, and 250 nm particles are respectively 0.15, 0.19, 0.22, 0.27, and 0.29, showing an increasing trend with increasing particle size. When PM2.5 mass concentration is greater than 50 Μg m−3, the fractions of the hydrophilic mode for 150, 250, 350 nm particles increased towards 1 as PM2.5 mass concentration increased. This indicates that aged particles dominated during severe pollution periods in the atmosphere of Beijing. Particle hygroscopic growth can be well predicted using high time-resolution size-resolved chemical composition derived from AMS measurement on a basis of ZSR mixing rule. An empirical relationship between κ of organic fraction (Κorg) and oxygen to carbon ratio (O : C) (Κorg= 0.08·O : C+0.02) is obtained. During new particle formation event associating with strongly active photochemistry, the hygroscopic growth factor or κ of newly formed particles is greater than for particle with the same sizes during non-NPF periods. A quick transformation from external mixture to internal mixture for pre-existing particles (for example 250 nm particle) was observed. Such transformations can modify the state of mixture of pre-exiting particles and thus modify properties such as the light absorption coefficient and cloud condensation nuclei activation.

Particle hygroscopicity and its link to chemical composition in the urban atmosphere of Beijing, China during summertime

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