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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-884
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
13 Oct 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
Ice nucleating particle concentrations unaffected by urban air pollution in Beijing, China
Jie Chen1, Zhijun Wu1, Stefanie Augustin-Bauditz2, Sarah Grawe2, Markus Hartmann2, Xiangyu Pei3, Zirui Liu4, Dongsheng Ji4, and Heike Wex2 1State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, 100871, Beijing, China
2Leibniz Institute for Tropospheric Research, 04318, Leipzig, Germany
3Department of Chemistry and Molecular Biology, University of Gothenburg, 41296, Gothenburg, Sweden
4State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, 100029, Beijing, China
Abstract. Exceedingly high levels of PM2.5 with complex chemical composition occur frequently in China. It has been speculated if anthropogenic PM2.5 may significantly contribute ice nucleating particles (INP). However, few studies have focused on the ice-nucleating properties of urban particles. In this work, two ice-nucleating droplet arrays have been used to determine the atmospheric number concentration of INP (NINP) in the range from −6 ºC to −25 ºC in Beijing. No correlations between NINP and neither PM2.5 nor black carbon mass concentrations were found, although both varied by more than a factor of 30 during the sampling period. Similarly, there were no correlations between NINP and either total particle number concentration or number concentrations for particles with diameters > 500 nm. Furthermore, there was no clear difference between day and night samples. All these indicate that Beijing air pollution did not increase or decrease INP concentrations in the examined temperature range above values observed in non-urban areas, hence, the background INP concentrations might not be anthropogenically influenced as far as urban air pollution is concerned, at least in the examined temperature range.

Citation: Chen, J., Wu, Z., Augustin-Bauditz, S., Grawe, S., Hartmann, M., Pei, X., Liu, Z., Ji, D., and Wex, H.: Ice nucleating particle concentrations unaffected by urban air pollution in Beijing, China, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-884, in review, 2017.
Jie Chen et al.
Jie Chen et al.
Jie Chen et al.

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Short summary
The ice nucleation activity of urban aerosols in the atmosphere of Beijing were detected in this study. Results showed that ice-nucleating particle (INP) concentrations were not influenced by the highly variable amounts of atmospheric particles, both in mass and particle number concentrations, implying that INP concentrations might not be influenced directly by anthropogenic activities at least not down to roughly −25 °C and maybe even below.
The ice nucleation activity of urban aerosols in the atmosphere of Beijing were detected in this...
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