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Characterization of new particle and secondary aerosol formation during summertime in Beijing, China Cover

Characterization of new particle and secondary aerosol formation during summertime in Beijing, China

Open Access
|Jan 2011

Abstract

Size-resolved aerosol number and mass concentrations and the mixing ratios of O3 and various trace gases were continuously measured at an urban station before and during the Beijing Olympic and Paralympic Games (5 June to 22 September, 2008). 23 new particle formation (NPF) events were identified; these usually were associated with changes in wind direction and/or rising concentrations of gas-phase precursors or after precipitation events. Most of the NPF events started in the morning and continued to noon as particles in the nucleation mode grew into the Aitken mode. From noon to midnight, the aerosols grew into the accumulation mode through condensation and coagulation. Ozone showed a gradual rise starting around 10:00 local time, reached its peak around 15:00 and then declined as the organics increased. The dominant new particle species were organics (40-75% of PM1) and sulphate; nitrate and ammonium were more minor contributors.

Language: English
Page range: 382 - 394
Submitted on: May 27, 2009
Accepted on: Mar 8, 2011
Published on: Jan 1, 2011
Published by: Stockholm University Press
In partnership with: Paradigm Publishing Services

© 2011 Y. M. Zhang, X. Y. Zhang, J. Y. Sun, W. L. Lin, S. L. Gong, X. J. Shen, S. Yang, published by Stockholm University Press
This work is licensed under the Creative Commons Attribution 4.0 License.