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Size-resolved effective density of submicron particles during summertime in the rural atmosphere of Beijing, China

Journal article
Authors K. Qiao
Z. J. Wu
Xiangyu Pei
Q. Y. Liu
D. J. Shang
J. Zheng
Z. F. Du
W. F. Zhu
Y. S. Wu
S. R. Lou
S. Guo
C. K. Chan
Ravi K. Pathak
Mattias Hallquist
M. Hu
Published in Journal of Environmental Sciences
Volume 73
Pages 69-77
ISSN 1001-0742
Publication year 2018
Published at Department of Chemistry and Molecular Biology
Pages 69-77
Language en
Links dx.doi.org/10.1016/j.jes.2018.01.01...
Keywords Effective density, Atmospheric aerosol, Centrifugal particle mass analyzer, Rural site, New particle, secondary organic aerosol, mass analyzer, sulfuric-acid, diurnal-variation, haze formation, urban, mobility, growth, soot, hygroscopicity, Environmental Sciences & Ecology
Subject categories Meteorology and Atmospheric Sciences, Environmental chemistry, Environmental Sciences, Climate Research, Chemical Sciences, Earth and Related Environmental Sciences, Physical Chemistry, Analytical Chemistry, Ecology

Abstract

Particle density is an important physical property of atmospheric particles. The information on high time-resolution size-resolved particle density is essential for understanding the atmospheric physical and chemical aging processes of aerosols particles. In the present study, a centrifugal particle mass analyzer (CPMA) combined with a differential mobility analyzer (DMA) was deployed to determine the size-resolved effective density of 50 to 350 nm particles at a rural site of Beijing during summer 2016. The measured particle effective densities decreased with increasing particle sizes and ranged from 1.43 to 1.55 g/cm(3), on average. The effective particle density distributions were dominated by a mode peaked at around 1.5 g/cm(3) for 50 to 350 nm particles. Extra modes with peaks at 1.0, 0.8, and 0.6 g/cm(3) for 150, 240, and 350 nm particles, which might be freshly emitted soot particles, were observed during intensive primary emissions episodes. The particle effective densities showed a diurnal variation pattern, with higher values during daytime. A case study showed that the effective density of Aitken mode particles during the new particle formation (NPF) event decreased considerably, indicating the significant contribution of organics to new particle growth. (C) 2018 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.

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