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Discussion papers
https://doi.org/10.5194/acp-2019-60
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-60
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 13 Mar 2019

Research article | 13 Mar 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Variation of size-segregated particle number concentrations in winter Beijing

Ying Zhou1, Lubna Dada1,2, Yiliang Liu3, Yueyun Fu4, Juha Kangasluoma1,2, Tommy Chan1, Chao Yan2, Biwu Chu2, Kaspar R. Daellenbach2, Federico Bianchi2, Tom Kokkonen2, Yongchun Liu1, Joni Kujansuu1,2, Veli-Matti Kerminen2, Tuukka Petäjä2, Lin Wang3, Jingkun Jiang4, and Markku Kulmala1,2 Ying Zhou et al.
  • 1Aerosol and Haze Laboratory, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, China
  • 2Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Finland
  • 3Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science & Engineering, Jingwan Campus, Fudan University, Shanghai 200438, China
  • 4School of Environment, Tsinghua University, Beijing, China

Abstract. Aerosol number concentration varying spatially and temporally is a good indicator of the dynamic behavior of Beijing's atmospheric cocktail. This variation represents the strength of different contributing primary and secondary sources such as traffic and new particle formation, respectively. In this paper we report size-segregated particle number concentrations observed at newly developed Beijing station during winter 2018. Our measurements cover number size distributions of particles in a diameter range between 1.5 nm and 1 μm (cluster mode, nucleation mode, Aitken mode and accumulation mode), thus being descriptive of a major fraction of the processes happening in the atmosphere of Beijing. Here we aim to explain the concentration variation in the observed modes by relating them to potential aerosol sources as well as to understand the connection between the modes. We focused on two types of days (haze and new particle formation) and divided the data accordingly. Our results show that during new particle formation (NPF) days, an increase in the cluster mode particles was observed. In contrast, during haze days we observed a high concentration of accumulation mode particles. There was a clear correlation between the cluster and nucleation modes during NPF days, while it was absent during haze days. In addition, we correlated the different modes with concentrations of trace gases and other parameters measured at our station. Our results show that all modes in the sub-micron size range correlated with NOx which clearly reflects the contribution of traffic to all particle sizes.

Ying Zhou et al.
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Short summary
Atmospheric aerosol pollution attracts increasing interests for their adverse heath affect. There are quite amount of researches on their sources by mass concentration, but on a few researches on their sources by number concentration. In our research, we try to figure out the source of particles by number concentration by relating them to trace gases in the atmospheric cocktail in urban Beijing including sub-3 nm particles number concentration.
Atmospheric aerosol pollution attracts increasing interests for their adverse heath affect....
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