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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-2017-330
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
27 Oct 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).
A novel method for calculating ambient aerosol liquid water contents based on measurements of a humidified nephelometer system
Ye Kuang1,2, Chunsheng Zhao1, Gang Zhao1, Jiangchuan Tao1,2, Nan Ma2, and Yuxuan Bian3 1Department of Atmospheric and Oceanic Sciences, School of Physics, Pe king University, Beijing, China
2Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China
3State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences
Abstract. Water condensed on ambient aerosol particles plays significant roles in atmospheric environment, atmospheric chemistry and climate. So far, no instruments are available for real-time monitoring of ambient aerosol liquid water contents (ALWC). In this paper, a novel method is proposed to calculate ambient ALWC based on measurements of a three-wavelength humidified nephelometer system. A humidified nephelometer system measures aerosol light scattering coefficients and backscattering coefficients at three wavelengths under dry and different relative humidity (RH) conditions, and therefore provides measurements of light scattering enhancement factor f(RH). The proposed method of calculating ALWC includes two steps. The first step is estimating total volume concentration of ambient aerosol particles in dry state (Va (dry)) with a machine learning method based on measurements of the “dry” nephelometer. The estimated Va (dry) agrees well with the measured Va (dry). The second step is estimating the volume growth factor Vg(RH) of ambient aerosol particles due to water uptake using f(RH) and Ångström exponent. The ALWC is calculated from the estimated Va (dry) and Vg(RH). Uncertainty analysis of the estimated Va (dry) and Vg(RH) is conducted. This research have bridged the gap between f(RH) and Vg(RH). The advantage of this new method is that the ambient ALWC can be obtained using only measurements from a three-wavelength humidified nephelometer system. This method will facilitate the real-time monitoring of the ambient ALWC and help for studying roles of aerosol liquid water in atmospheric chemistry, secondary aerosol formation and climate change.

Citation: Kuang, Y., Zhao, C., Zhao, G., Tao, J., Ma, N., and Bian, Y.: A novel method for calculating ambient aerosol liquid water contents based on measurements of a humidified nephelometer system, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-330, in review, 2017.
Ye Kuang et al.
Ye Kuang et al.

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Short summary
Aerosol water has become an important topic recently because of its implications for multiphase secondary aerosol formation during severe haze events in Asia. This is a timely paper on this topic. A novel method is proposed to calculate ambient aerosol liquid water contents based only on measurements of a three-wavelength humidified nephelometer system. The advantage of this method is that this technique can provide continuous measurements of the changing ambient conditions.
Aerosol water has become an important topic recently because of its implications for multiphase...
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