Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/14661
Title: Measurement of aerosol number size distributions in the Yangtze River delta in China : formation and growth of particles under polluted conditions
Authors: Gao, J
Wang, T 
Zhou, X
Wu, W
Wang, W
Keywords: New particle formation
Photochemical activity
Shanghai
Sulfur dioxide
Issue Date: 2009
Publisher: Pergamon Press
Source: Atmospheric environment, 2009, v. 43, no. 4, p. 829-836 How to cite?
Journal: Atmospheric environment 
Abstract: Particle size distribution is important for understanding the sources and effects of atmospheric aerosols. In this paper we present particle number size distributions (10 nm-10 μm) measured at a suburban site in the fast developing Yangtze River Delta (YRD) region (near Shanghai) in summer 2005. The average number concentrations of ultrafine (10-100 nm) particles were 2-3 times higher than those reported in the urban areas of North America and Europe. The number fraction of the ultrafine particles to total particle count was also 20-30% higher. The sharp increases in ultrafine particle number concentrations were frequently observed in late morning, and the particle bursts on 5 of the 12 nucleation event days can be attributed to the homogeneous nucleation leading to new particle formation. The new particle formation events were characterized with a larger number of nucleation-mode particles, larger particle surface area, and larger condensational sink than usually reported in the literature. These suggest an intense production of sulfuric acid from photo-oxidation of sulfur dioxide in the YRD. Overall, the growth rate of newly formed particles was moderate (6.4 ± 1.6 nm h-1), which was comparable to that reported in the literature.
URI: http://hdl.handle.net/10397/14661
ISSN: 1352-2310
EISSN: 1873-2844
DOI: 10.1016/j.atmosenv.2008.10.046
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