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https://doi.org/10.5194/acp-2020-450
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-450
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  04 Jun 2020

04 Jun 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.

Hygroscopicity of urban aerosols and its link to size-resolved chemical composition during spring/summertime in Seoul, Korea

Najin Kim1, Seong Soo Yum1, Minsu Park1, Jong Sung Park2, Hye Jung Shin2, and Joon Young Ahn2 Najin Kim et al.
  • 1Department of Atmosphere Science, Yonsei university, Seoul, 03722, Korea
  • 2Air Quality Research Division, National Institute of Environment Research, Incheon, 22689, Korea

Abstract. Chemical effects on the size-resolved hygroscopicity of urban aerosols were examined based on the KORUS-AQ field campaign data. The information on size-resolved hygroscopicity and chemical composition of aerosols were obtained by a hygroscopic tandem differential mobility analyzer (HTDMA) and a high-resolution time of flight aerosol mass spectrometer (HR-ToF-AMS), respectively. Good correspondences were shown between the measured and estimated κ values calculated from the combination of bulk chemical composition data and oxidation parameters of organic aerosols (f44 and O/C). These results infer that chemical composition is closely associated with aerosol hygroscopicity. However, the correlation between measured and estimated κ values degraded as particle size decreased, implying that the size-resolved chemical composition data is required for more detailed hygroscopicity analysis. In addition to size-resolved chemical data, the m/z tracer method was applied for size-resolved organic factors. Specifically, m/z 57 and 44 were used as AMS spectral markers for HOA and OOA, respectively. These size-resolved chemical composition data were found to be critical in explaining the size-dependent hygroscopicity as well as the diurnal variation of κ for small particles, i.e., low κ in the morning and high κ in the afternoon. Additionally, aerosol mixing state information was associated with the size-resolved chemical composition data. That is, the relationship between the number fraction of each hygroscopicity mode and the volume fraction of different chemical composition was investigated. It was found that the HOA volume fraction explained about 60 % of the variation of less hygroscopic (LH) mode number fraction for externally mixed aerosols.

Najin Kim et al.

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Najin Kim et al.

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Latest update: 29 Sep 2020
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Short summary
Chemical effects on the size-resolved hygroscopicity of urban aerosols were examined based on the KORUS-AQ field campaign data (HTDMA and HR-ToF-AMS). The size-resolved chemical composition data were found to be critical in explaining the size-dependent hygroscopicity as well as the diurnal variation of κ for small particles. Aerosol mixing state information was associated with the size-resolved chemical composition data to reveal chemical information of different hygroscopicity modes.
Chemical effects on the size-resolved hygroscopicity of urban aerosols were examined based on...
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