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Volume 17, issue 14
Atmos. Chem. Phys., 17, 8825–8835, 2017
https://doi.org/10.5194/acp-17-8825-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 17, 8825–8835, 2017
https://doi.org/10.5194/acp-17-8825-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 20 Jul 2017

Research article | 20 Jul 2017

Observations of particles at their formation sizes in Beijing, China

Rohan Jayaratne et al.

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Asmi, E., Sipilä, M., Manninen, H. E., Vanhanen, J., Lehtipalo, K., Gagné, S., Neitola, K., Mirme, A., Mirme, S., Tamm, E., Uin, J., Komsaare, K., Attoui, M., and Kulmala, M.: Results of the first air ion spectrometer calibration and intercomparison workshop, Atmos. Chem. Phys., 9, 141–154, https://doi.org/10.5194/acp-9-141-2009, 2009.
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Curtius, J.: Nucleation of atmospheric aerosol particles, C. R. Phys., 7, 1027–1045, 2006.
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Dal Maso, M., Kulmala, M., Riipinen, I., Wagner, R., Hussein, T., Aalto, P. P., and Lehtinen, K. E.: Formation and growth of fresh atmospheric aerosols: eight years of aerosol size distribution data from SMEAR II, Hyytiala, Finland, Boreal Environ. Res., 10, 323–336, 2005.
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Observations over a continuous 3-month period in Beijing showed 26 new particle formation (NPF) events, generally coinciding with periods with relatively clean air when the wind direction was from the less industrialized north. Large particles in the atmosphere suppress the gaseous supersaturation that is required for NPF. No events were observed when the daily mean PM2.5 concentration exceeded 43 µg m−3. These results provide useful insight into the formation of haze events in megacities.
Observations over a continuous 3-month period in Beijing showed 26 new particle formation (NPF)...
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