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Analysis on concentration and source rate of precursor vapors participating in particle formation and growth at xinken in the Pearl River Delta of China

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Analysis on concentration and source rate of precursor vapors participating in particle formation and growth at xinken in the Pearl River Delta of China

Content Provider	Springer Nature Link
Author	Gong, Youguo Su, Hang Cheng, Yafang Liu, Feng Wu, Zhijun Hu, Min Zeng, Limin Zhang, Yuanhang
Copyright Year	2008
Abstract	Concentration and source rate of precursor vapors participating in particle formation and subsequent growth were investigated during the Pearl River Delta intensive campaign (PRD2004, October 2004) in southeastern China. Four new particle formation event days and a typical non-event day were selected for our analysis. Atmospheric sulphuric acid, the important precursor vapor in nucleation and growth, were simulated with a pseudo steady-state model based on the measurements of SO2, NO x , O3, CO, non-methane hydrocarbon (NMHC) and ambient particle number concentrations as well as modeled photolysis frequencies obtained from measurements. The maximum midday sulphuric acid concentrations vary from 4.53 × 107 to 2.17 × 108 molecules cm−3, the corresponding source rate via reaction of OH and SO2 range between 2.37 × 106 and 1.16 × 107 molecules cm−3 s−1. Nucleation mode growth rate was derived from size spectral evolution during the events to be 6.8-13.8 nm h−1. Based on the growth rate, concentration of the vapors participating in subsequent growth were estimated to vary from 1.32 × 108 to 2.80 × 108 molecules cm−3 with corresponding source rate between 7.26 × 106 and 1.64 × 107 molecules cm−3 s−1. Our results show the degree of pollution is larger in PRD. Sulphuric acid concentrations are fairly high and have a close correlation with new particle formation events. Budget analysis shows that sulphuric acid alone is not enough for required growth; other nonvolatile vapors are needed. However, sulphuric acid plays an important role in growth; the contribution of sulphuric acid to growth in PRD is 12.4%–65.2%.
Starting Page	427
Ending Page	436
Page Count	10
File Format	PDF
ISSN	02561530
Journal	Advances in Atmospheric Sciences
Volume Number	25
Issue Number	3
e-ISSN	18619533
Language	English
Publisher	SP Science Press
Publisher Date	2008-05-26
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	particle formation and growth sulphuric acid pseudo steady state model condensation sink precursor vapors source rate Geophysics/Geodesy Meteorology/Climatology
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

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