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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/acp-2020-215
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-215
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  27 Mar 2020

27 Mar 2020

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A revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Size-resolved particle number emissions in Beijing determined from measured particle size distributions

Jenni Kontkanen1,2, Chenjuan Deng3, Yueyun Fu3, Lubna Dada2, Ying Zhou1, Jing Cai2, Kaspar R. Dällenbach2, Simo Hakala2, Tom V. Kokkonen2,4, Zhuohui Lin1, Yongchun Liu1, Yonghong Wang2, Chao Yan1,2, Tuukka Petäjä2, Jingkun Jiang3, Markku Kulmala1,2, and Pauli Paasonen1,2 Jenni Kontkanen 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, Helsinki, Finland
  • 3State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, China
  • 4Joint International Research Laboratory of Atmospheric and Earth System Sciences, School of Atmospheric Sciences, Nanjing University, Nanjing, China

Abstract. The climate and air quality effects of aerosol particles depend on the number and size of the particles. In urban environments, a large fraction of aerosol particles originates from anthropogenic emissions. To evaluate the effects of different pollution sources on air quality, knowledge of size distributions of particle number emissions is needed. Here we introduce a novel method for determining size-resolved particle number emissions based on measured particle size distributions. We apply our method to data measured in Beijing, China, to determine the number size distribution of emitted particles in diameter range from 2 to 1000 nm. The observed particle number emissions are dominated by emissions of particles smaller than 30 nm. Our results suggest that traffic is the major source of particle number emissions with the highest emissions observed for particles around 10 nm during rush hours. At sizes below 6 nm, clustering of atmospheric vapors contributes to calculated emissions. The comparison between our calculated emissions and those estimated with an integrated assessment model GAINS shows that our method yields clearly higher particle emissions at sizes below 60 nm, but at sizes above that the two methods agree well. Overall, our method is proven to be a useful tool for gaining new knowledge of size distributions of particle number emissions in urban environments.

Jenni Kontkanen et al.

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Jenni Kontkanen et al.

Jenni Kontkanen et al.

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Short summary
To estimate the impacts of atmospheric aerosol particles on air quality, knowledge of size distributions of particles emitted from anthropogenic sources is needed. We introduce a new method for determining size-resolved particle number emissions from measured particle size distributions. We apply our method to data measured in Beijing, China. We find that particle number emissions at our site are dominated by emissions of particles smaller than 30 nm, originating mainly from traffic.
To estimate the impacts of atmospheric aerosol particles on air quality, knowledge of size...
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