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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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We compared the relative number percentage of individual particles at ground level and above the mixed layer height. We found the particles above the mixed layer height during haze-days are more aged compared with ground level. More coal combustion related organic particles were found above the mixed layer height. We suggested that the particles above the mixed layer height affected by the surrounding areas and once mixed down to the ground, they might contribute the ground air pollution.
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Preprints
https://doi.org/10.5194/acp-2020-1031
https://doi.org/10.5194/acp-2020-1031

  30 Nov 2020

30 Nov 2020

Review status: this preprint is currently under review for the journal ACP.

Measurement report: Comparison of wintertime individual particles at ground level and above the mixed layer in urban Beijing

Wenhua Wang1,2,3, Longyi Shao1, Claudio Mazzoleni3, Yaowei Li1, Simone Kotthaus4, Sue Grimmond4, Janarjan Bhandari3, Jiaoping Xing1,5, Xiaolei Feng1, Mengyuan Zhang1, and Zongbo Shi6 Wenhua Wang et al.
  • 1State Key Laboratory of Coal Resources and Safe Mining & College of Geosciences and Surveying Engineering, China University of Mining and Technology, Beijing, 100083, China
  • 2School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, China
  • 3Atmospheric Sciences Program & Physics Department, Michigan Technological University, Houghton, 49931, USA
  • 4Department of Meteorology, University of Reading, Reading, RG6 6BB, UK
  • 5School of Forestry, Jiangxi Agricultural University, Nanchang, 330045, China
  • 6School of Geography Earth and Environmental Sciences, the University of Birmingham, Birmingham, B15 2TT, UK

Abstract. Beijing has been suffering from frequent severe air pollution events, with concentrations affected significantly by the mixed layer height. Major efforts have been made to study the physico-chemical properties, composition, and sources of aerosol particles at ground level. However, little is known on morphology, elemental composition, and mixing state of aerosol particles above the mixed layer. In this work, we collected individual aerosol particles simultaneously at ground level (2 m above ground) and above the mixed layer in urban Beijing (within the Atmospheric Pollution and Human Health in a Chinese Megacity (APHH-Beijing) 2016 winter campaign). The particles were analyzed off-line using transmission electron microscopy coupled with energy dispersive X-ray spectroscopy. Our results showed that the relative number contribution of mineral particles to all measured particles was much higher during non-haze periods (42.5 %) than haze periods (18.1 %); on the contrary, internally mixed particles contributed more during haze periods (21.9 %) than non-haze periods (7.2 %) at ground level. In addition, more mineral particles were found at ground level than above the mixed layer height. Around 20 % of individual particles showed core-shell structures during haze periods, whereas only a few core-shell particles were observed during non-haze periods (2 %). We found that the particle above the mixed layer tend to be more aged with a larger proportion of organic particles originated from coal combustion. Our results indicate that a significant fraction of the airborne particles above the mixed layer originated from surrounding areas influenced by coal combustion activities. This source contributes to the surface particle concentrations in Beijing when polluted air is mixed down to the ground level.

Wenhua Wang et al.

 
Status: open (until 25 Jan 2021)
Status: open (until 25 Jan 2021)
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Wenhua Wang et al.

Wenhua Wang et al.

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Short summary
We compared the relative number percentage of individual particles at ground level and above the mixed layer height. We found the particles above the mixed layer height during haze-days are more aged compared with ground level. More coal combustion related organic particles were found above the mixed layer height. We suggested that the particles above the mixed layer height affected by the surrounding areas and once mixed down to the ground, they might contribute the ground air pollution.
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