Preprints
https://doi.org/10.5194/acp-2021-339
https://doi.org/10.5194/acp-2021-339

  23 Jun 2021

23 Jun 2021

Review status: a revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

A black carbon peak in the free troposphere of Beijing induced by cyclone lifting and transport from Central China

Zhenbin Wang1,2,3,4, Bin Zhu1,2,3,4, Hanqing Kang1,2,3,4, Wen Lu1,2,3,4, Shuqi Yan1,2,3,4, Delong Zhao5, and Weihang Zhang6 Zhenbin Wang et al.
  • 1Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster, Nanjing University of Information Science and Technology, Nanjing, 210044, China
  • 2Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing, 210044, China
  • 3Key Laboratory of Meteorological Disaster, Ministry of Education (KLME), Nanjing University of Information Science and Technology, Nanjing, 210044, China
  • 4Joint International Research Laboratory of Climate and Environment Change (ILCEC), Nanjing University of Information Science and Technology, Nanjing, 210044, China
  • 5Beijing Weather Modification Office, Beijing, 100089, China
  • 6College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao, 266100, China

Abstract. Observations suggest that the vertical distributions of air pollutants, such as black carbon (BC), present as various types depending on the emission sources and meteorological diffusion conditions. However, the formation process and source appointment of some special BC profiles are not fully understood. In this paper, by using the Weather Research and Forecasting model coupled with chemistry (WRF-Chem) with a BC-tagging technique, we investigate the formation mechanism and regional sources of a BC peak in the free troposphere observed by aircraft flight in Beijing (BJ) on May 5th, 2018. The results show that the contribution rate of the Beijing-Tianjin-Hebei (BTH) region to the surface BC of BJ exceeded 80 % in this case. Local sources dominated BC in BJ from the surface to approximately 700 m (78.5 %), while the BC peak in the free troposphere (~4000 m) was almost entirely imported from external sources (99.8 %). Combining BC tracking and process analysis, we find that horizontal advection (HADV) and vertical advection (VADV) processes played an important role in the convergent and upward movement and the transport of BC. The BC originating from the surface in central provinces, including Shanxi (SX), Henan (HN) and Hebei (HB), was uplifted through a cyclone system 16 hours previously, transported to a height of approximately 3000 m above BJ, and then lifted by the VADV process to approximately 4000 m. At the surface, BJ and its surroundings were under the control of a weak pressure gradient, leading to the accumulation of BC within the boundary layer. Our results indicate that cyclone systems can quickly lift air pollutants, such as BC, up to the free troposphere, as well as extend their lifetimes and further affect the regional atmospheric environment and climate.

Zhenbin Wang et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-339', Anonymous Referee #2, 26 Aug 2021
    • AC5: 'Reply on RC1', Wang Zhenbin, 22 Sep 2021
  • RC2: 'Comment on acp-2021-339', Anonymous Referee #1, 08 Sep 2021
    • AC2: 'Reply on RC2', Wang Zhenbin, 22 Sep 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-339', Anonymous Referee #2, 26 Aug 2021
    • AC5: 'Reply on RC1', Wang Zhenbin, 22 Sep 2021
  • RC2: 'Comment on acp-2021-339', Anonymous Referee #1, 08 Sep 2021
    • AC2: 'Reply on RC2', Wang Zhenbin, 22 Sep 2021

Zhenbin Wang et al.

Zhenbin Wang et al.

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Short summary
In this paper, by using the WRF-Chem with a BC-tagging technique, we investigate the formation mechanism and regional sources of a BC peak in the free troposphere observed by aircraft flight. Local sources dominated BC from the surface to about 700 m (78.5 %), while the BC peak in the free troposphere was almost imported from external sources (99.8 %). Our results indicate that cyclone systems can quickly lift BC up to the free troposphere, as well as extend their lifetimes.
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