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https://doi.org/10.5194/acp-2019-660
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-660
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 14 Aug 2019

Submitted as: research article | 14 Aug 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

The evolution of cloud microphysics upon aerosol interaction at the summit of Mt. Tai, China

Jiarong Li1, Chao Zhu1, Hui Chen1, Defeng Zhao1, Likun Xue2, Xinfeng Wang2, Hongyong Li2, Pengfei Liu3,4,5, Junfeng Liu3,4,5, Chenglong Zhang3,4,5, Yujing Mu3,4,5, Wenjin Zhang6, Luming Zhang7, Kai Li7, Min Liu7, Hartmut Herrmann1,2,8, and Jianmin Chen1,4,9 Jiarong Li et al.
  • 1Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Institute of Atmospheric Sciences, Fudan University, Shanghai 200438, China
  • 2Environment Research Institute, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China
  • 3Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing 10085, China
  • 4Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Science, Xiamen 361021, China
  • 5University of Chinese Academy of Sciences, Beijing 100049, China
  • 6State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
  • 7Tai'an Municipal Ecological Environment Bureau, Shandong Tai'an Ecological Environment Monitoring Center, Tai'an 271000, China
  • 8Leibniz Institute for Tropospheric Research, Leipzig, Germany
  • 9Shanghai Institute of Eco-Chongming (SIEC), No.3663 Northern Zhongshan Road, Shanghai 200062, China

Abstract. The influence of aerosols, both natural and anthropogenic, remains a major area of uncertainty when predicting the properties and behaviour of clouds and their influence on climate. In an attempt to understand better the microphysical properties of cloud droplets, the aerosol-cloud interactions, and the corresponding climate effect during cloud life cycles in the North China Plain, an intensive observation took place from 17 June to 30 July 2018 at the summit of Mt. Tai. Cloud microphysical parameters were monitored simultaneously with number concentrations of cloud condensation nuclei (NCCN) at different supersaturations, PM2.5 mass concentrations, particle size distributions and meteorological parameters. Number concentrations of cloud droplets (NC), liquid water content (LWC) and effective radius of cloud droplets (reff) show large variations among 40 cloud events observed during the campaign. Perturbations of aerosols will significantly increase the NC of cloud droplets and shift cloud droplets toward smaller size ranges. Clouds in clean days are more susceptible to the change in concentrations of particle number (NP). LWC shows positive correlation with reff. As NC increases, reff changes from a trimodal distribution to a unimodal distribution. By assuming a cloud thickness of 100 m, we find that the albedo can increase 36.4 % if the cloud gets to be disturbed by aerosols. This may induce a cooling effect on the local climate system. Our results contribute more information about regional cloud microphysics and will help to reduce the uncertainties in climate models when predicting climate responses to cloud-aerosol interactions.

Jiarong Li et al.
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Short summary
Based on a field measurement study at Mt. Tai, China, the aerosol-cloud interactions and the corresponding climate effect during cloud life cycles in the North China Plain were discussed. The summit of Mt. Tai supplies a potential access for aerosol transportation. Results of this study demonstrated that the transported aerosols influenced the cloud microphysical properties and the cloud life cycle at Mt. Tai. It increased the cloud albedo and may further influence the regional climate.
Based on a field measurement study at Mt. Tai, China, the aerosol-cloud interactions and the...
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