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Title: Particle number size distribution and new particle formation : new characteristics during the special pollution control period in Beijing
Authors: Gao, J
Chai, F
Wang, T 
Wang, S
Wang, W
Issue Date: 2012
Source: Journal of environmental sciences, 2012, v. 24, no. 1, p. 14-21
Abstract: New particle formation is a key process in shaping the size distribution of aerosols in the atmosphere. We present here the measurement results of number and size distribution of aerosol particles (10-10000 nm in diameter) obtained in the summer of 2008, at a suburban site in Beijing, China. We firstly reported the pollution level, particle number size distribution, diurnal variation of the particle number size distribution and then introduced the characteristics of the particle formation processes. The results showed that the number concentration of ultrafine particles was much lower than the values measured in other urban or suburban areas in previous studies. Sharp increases of ultrafine particle count were frequently observed at noon. An examination of the diurnal pattern suggested that the burst of ultrafine particles was mainly due to new particle formation promoted by photochemical processes. In addition, high relative humidity was a key factor driving the growth of the particles in the afternoon. During the 2-month observations, new particle formation from homogeneous nucleation was observed for 42.7% of the study period. The average growth rate of newly formed particles was 3.2 nm/hr, and varied from 1.2 to 8.0 nm/hr. The required concentration of condensable vapor was 4.4 × 10 7 cm -3, and its source rate was 1.2 × 10 6 cm -3sec -1. Further calculation on the source rate of sulphuric acid vapor indicated that the average participation of sulphuric acid to particle growth rates was 28.7%.
Keywords: Beijing
Condensational sink
New particle formation
Particle number size distribution
Sulphuric acid
Publisher: Elsevier
Journal: Journal of environmental sciences 
ISSN: 1001-0742
EISSN: 1878-7320
DOI: 10.1016/S1001-0742(11)60725-0
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