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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 |
Appears in Collections: | Journal/Magazine Article |
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