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Journal of Meteorological Research

, Volume 33, Issue 1, pp 126–137 | Cite as

Below-Cloud Aerosol Scavenging by Different-Intensity Rains in Beijing City

  • Tian Luan
  • Xueliang GuoEmail author
  • Tianhang Zhang
  • Lijun Guo
Regular Articles
  • 16 Downloads

Abstract

Below-cloud aerosol scavenging process by precipitation is important for cleaning the polluted aerosols in the atmosphere, and is also a main process for acid rain formation. However, the related physical mechanism has not been well documented and clarified yet. In this paper, we investigated the below-cloud PM2.5 (particulate matter with aerodynamic diameter being 2.5 μm or less) scavenging by different-intensity rains under polluted conditions characterized by high PM2.5 concentrations, based on in-situ measurements from March 2014 to July 2016 in Beijing city. It was found that relatively more intense rainfall events were more efficient in removing the polluted aerosols in the atmosphere. The mean PM2.5 scavenging ratio and its standard deviation (SD) were 5.1% ± 25.7%, 38.5% ± 29.0%, and 50.6% ± 21.2% for light, moderate, and heavy rain events, respectively. We further found that the key impact factors on below-cloud PM2.5 scavenging ratio for light rain events were rain duration and wind speed rather than raindrop size distribution. However, the impacts of rain duration and wind speed on scavenging ratio were not important for moderate and heavy rain events. To our knowledge, this is the first statistical result about the effects of rain intensity, rain duration, and raindrop size distribution on below-cloud scavenging in China.

Key words

PM2.5 below-cloud scavenging rain intensity impact factors 

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Notes

Acknowledgment

The authors highly appreciate the constructive comments from the Editor and two anonymous reviewers.

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Copyright information

© The Chinese Meteorological Society and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Tian Luan
    • 1
    • 2
  • Xueliang Guo
    • 1
    • 2
    • 3
    Email author
  • Tianhang Zhang
    • 4
  • Lijun Guo
    • 1
    • 2
  1. 1.State Key Laboratory of Severe WeatherChinese Academy of Meteorological Sciences, China Meteorological AdministrationBeijingChina
  2. 2.Key Laboratory for Cloud Physics, Chinese Academy of Meteorological SciencesChina Meteorological AdministrationBeijingChina
  3. 3.Collaborative Innovation Center for Meteorological Disasters Forecast, Early Warning, and AssessmentNanjing University of Information Science & TechnologyNanjingChina
  4. 4.National Meteorological Center, China Meteorological AdministrationBeijingChina

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