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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/amt-2020-338
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-338
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  08 Sep 2020

08 Sep 2020

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This preprint is currently under review for the journal AMT.

Effects of Multi-Charge on Aerosol Hygroscopicity Measurement by HTDMA

Chuanyang Shen1, Gang Zhao1,2, and Chunsheng Zhao1 Chuanyang Shen et al.
  • 1Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing 100871, China
  • 2College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China

Abstract. The Humidified Tandem Differential Mobility Analyzer (HTDMA) is widely used to obtain the hygroscopic properties of submicron particles. Aerosol size-resolved hygroscopicity parameter κ measured by HTDMA will be influenced by the contribution of multiply charged aerosols, and this effect has seldom been discussed in previous field measurements. Our calculation demonstrates that the number ratio of multiply charged particles is quite considerable for some specific sizes between 100 nm and 300 nm, especially during the polluted episode. The multi charges will further lead to the shrinking effect of aerosol hygroscopicity in HTDMA measurements. Therefore, we propose a new algorithm to do the multi-charge correction for the size-resolved hygroscopicity κ considering both the shrinking effect and multi-charge number contribution. The application in field measurements shows that the relatively high hygroscopicity in the accumulation size range will lead to the overestimation of the particle's hygroscopicity smaller than 200 nm. The low hygroscopicity in coarse mode particles will lead to the underestimation of accumulation particles between 200 nm and 500 nm. The difference between corrected and measured κ can reach as large as 0.05, highlighting that special attention needs to be paid to the multi-charge effect when the HTDMA is used for the aerosol hygroscopicity measurement.

Chuanyang Shen et al.

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Chuanyang Shen et al.

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Short summary
Aerosol hygroscopicity measured by HTDMA is affected by multiply charged particles from two aspects: (1) number contribution and (2) the weakening effect. We propose an algorithm to do the multi-charge correction for aerosol's size-resolved κ based on these two effects and applied it in a field measurement. Results show that the difference between corrected and measured κ can reach as large as 0.05, highlighting that special attention needs to be paid to the multi-charge effect by HTDMA.
Aerosol hygroscopicity measured by HTDMA is affected by multiply charged particles from two...
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