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Discussion papers
https://doi.org/10.5194/acp-2019-141
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-141
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 26 Feb 2019

Research article | 26 Feb 2019

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

Mixing layer transport flux of particulate matter in Beijing, China

Yusi Liu1, Guiqian Tang2,3, Libo Zhou2, Bo Hu2, Baoxian Liu4,5, Yunting Li4,5, Shu Liu6, and Yuesi Wang2,3,7 Yusi Liu et al.
  • 1State Key Laboratory of Severe Weather & Key Laboratory for Atmospheric Chemistry of China Meteorology Administration, Chinese Academy of Meteorological Sciences, Beijing 100081, China
  • 2State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
  • 3Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
  • 4Beijing Municipal Environmental Monitoring Centre, Beijing 100048, China
  • 5Beijing Key Laboratory of Airborne Particulate Matter Monitoring Technology, Beijing 100048, China
  • 6Liaoning Provincial Environmental Monitoring & Experiment Center, Shenyang 110031, China
  • 7University of Chinese Academy of Sciences, Beijing 100049, China

Abstract. Quantifying the transport flux of atmospheric pollutants plays an important role in understanding the causes of atmospheric pollution and in making decisions regarding the prevention and control of atmospheric pollution. In this study, the mixing layer height and wind profile of the mixing layer were measured by ceilometer and doppler wind radar, respectively. The variation characteristics of atmospheric transport capacity (TC) were analyzed using these two datasets. The research showed that the TC appears to be strongest in spring (3940 ± 2110 m2 s−1) and weakens in summer (2953 ± 1322 m2 s−1), autumn (2580 ± 1601 m2 s−1) and winter (2913 ± 3323 m2 s−1). Combined with the near-surface fine particle concentration data, the TC influence on the PM2.5 concentration was studied, and there is a strong inverse correlation between the PM2.5 and TC in spring, autumn and winter (R = −0.66, −0.65 and −0.80, respectively) and a weak positive correlation in summer (R = 0.33). By calculating the transport flux of fine particles (TF), the TF in Beijing was found to be the highest in spring at 226 ± 294 mg m−1 s−1 and lower in the other three seasons at approximately 140 mg m−1 s−1. Transport occurs between 14:00 and 18:00 LT. Except for during spring, the TF was large in the pollution transition period (summer: 328 ± 280 mg m−1 s−1, autumn: 280 ± 336 mg m−1 s−1 and winter: 240 ± 297 mg m−1 s−1) and decreased during the heavy pollution period (summer: 295 ± 215 mg m−1 s−1, autumn: 243 ± 238 mg m−1 s−1 and winter: 212 ± 209 mg m−1 s−1). Our results indicate that the transportation influence in southern regions should receive more focus in the transition period of pollution, while local emissions should receive more focus in the heavy pollution period.

Yusi Liu et al.
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Short summary
Weak atmospheric transport capacity (TC) is a key factor leading to the frequent occurrence of serious air pollution. This study is aim to analyze TC and its relationship with particulate matter, and to quantify the mixing-layer PM2.5 transport flux. Our results showed the main controlling factors during the transition and heavy polluted period in Beijing. The results help to understand the causes of atmospheric pollution and make decisions on prevention and control of atmospheric pollution.
Weak atmospheric transport capacity (TC) is a key factor leading to the frequent occurrence of...
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