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| Titel |
The roles of sulfuric acid in new particle formation and growth in the mega-city of Beijing |
| VerfasserIn |
D. L. Yue, M. Hu, R. Y. Zhang, Z. B. Wang, J. Zheng, Z. J. Wu, A. Wiedensohler, L. Y. He, X. F. Huang, T. Zhu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 10 ; Nr. 10, no. 10 (2010-05-28), S.4953-4960 |
| Datensatznummer |
250008487
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| Publikation (Nr.) |
 copernicus.org/acp-10-4953-2010.pdf |
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| Zusammenfassung |
| Simultaneous measurements of gaseous sulfuric acid and particle number size
distributions were performed to investigate aerosol nucleation and growth
during CAREBeijing-2008. The analysis of the measured aerosols and sulfuric
acid with an aerosol dynamic model shows the dominant role of sulfuric acid
in new particle formation (NPF) process but also in the subsequent growth in
Beijing. Based on the data of twelve NPF events, the average formation rates
(2–13 cm−3 s−1) show a linear correlation with the sulfuric acid
concentrations (R2=0.85). Coagulation seems to play a significant role
in reducing the number concentration of nucleation mode particles with the
ratio of the coagulation loss to formation rate being 0.41±0.16. The
apparent growth rates vary from 3 to 11 nm h−1. Condensation of
sulfuric acid and its subsequent neutralization by ammonia and coagulation
contribute to the apparent particle growth on average 45±18% and
34±17%, respectively. The 30% higher concentration of sulfate
than organic compounds in particles during the seven sulfur-rich NPF events
but 20% lower concentration of sulfate during the five sulfur-poor type
suggest that organic compounds are an important contributor to the growth of
the freshly nucleated particles, especially during the sulfur-poor cases. |
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