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  Variation of CCN activity during new particle formation events in the North China Plain

Ma, N., Zhao, C., Tao, J., Wu, Z., Kecorius, S., Wang, Z., et al. (2016). Variation of CCN activity during new particle formation events in the North China Plain. Atmospheric Chemistry and Physics, 16(13), 8593-8607. doi:10.5194/acp-16-8593-2016.

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 Creators:
Ma, N.1, Author              
Zhao, Chunsheng2, Author
Tao, Jiangchuan2, Author
Wu, Zhijun2, Author
Kecorius, Simonas2, Author
Wang, Z.1, Author              
Groess, Johannes2, Author
Liu, Hongjian2, Author
Bian, Yuxuan2, Author
Kuang, Ye2, Author
Teich, Monique2, Author
Spindler, Gerald2, Author
Mueller, Konrad2, Author
van Pinxteren, Dominik2, Author
Herrmann, Hartmut2, Author
Hu, Min2, Author
Wiedensohler, Alfred2, Author
Affiliations:
1Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826290              
2external, ou_persistent22              

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 Abstract: The aim of this investigation was to obtain a better understanding of the variability of the cloud condensation nuclei (CCN) activity during new particle formation (NPF) events in an anthropogenically polluted atmosphere of the North China Plain (NCP). We investigated the size-resolved activation ratio as well as particle number size distribution, hygroscopicity, and volatility during a 4-week intensive field experiment in summertime at a regional atmospheric observatory in Xianghe. Interestingly, based on a case study, two types of NPF events were found, in which the newly formed particles exhibited either a higher or a lower hygroscopicity. Therefore, the CCN activity of newly formed particles in different NPF events was largely different, indicating that a simple parameterization of particle CCN activity during NPF events over the NCP might lead to poor estimates of CCN number concentration (N-CCN). For a more accurate estimation of the potential N-CCN during NPF events, the variation of CCN activity has to be taken into account. Considering that a fixed activation ratio curve or critical diameter are usually used to calculate N-CCN, the influence of the variation of particle CCN activity on the calculation of N-CCN during NPF events was evaluated based on the two parameterizations. It was found that N-CCN might be underestimated by up to 30% if a single activation ratio curve (representative of the region and season) were to be used in the calculation; and might be underestimated by up to 50% if a fixed critical diameter (representative of the region and season) were used. Therefore, we suggest not using a fixed critical diameter in the prediction of N-CCN in NPF. If real-time CCN activity data are not available, using a proper fixed activation ratio curve can be an alternative but compromised choice.

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Language(s): eng - English
 Dates: 2016
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000381091400035
DOI: 10.5194/acp-16-8593-2016
 Degree: -

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Title: Atmospheric Chemistry and Physics
Source Genre: Journal
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Publ. Info: Katlenburg-Lindau, Germany : European Geosciences Union
Pages: - Volume / Issue: 16 (13) Sequence Number: - Start / End Page: 8593 - 8607 Identifier: ISSN: 1680-7316
CoNE: https://pure.mpg.de/cone/journals/resource/111030403014016