Preprints
https://doi.org/10.5194/acp-2020-1140
https://doi.org/10.5194/acp-2020-1140

  05 Jan 2021

05 Jan 2021

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

Warm Cover – Precursory Strong Signals hidden in the Middle Troposphere for Haze Pollution

Xiangde Xu1, Wenyue Cai1,2,3, Tianliang Zhao4, Xinfa Qiu5, Wenhui Zhu6, Chan Sun1, Peng Yan7, Chunzhu Wang8, and Fei Ge9 Xiangde Xu et al.
  • 1State Key Laboratory of Severe Weather (LASW), Chinese Academy of Meteorological Sciences, Beijing, China
  • 2National Climate Center, China Meteorological Administration, Beijing, China
  • 3School of Geographical Science, Nanjing University of Information Science and Technology, Nanjing, Jiangsu Province, China
  • 4Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing, Jiangsu Province, China
  • 5School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing, Jiangsu Province, China
  • 6Beijing Institute of Applied Meteorology, Beijing, China
  • 7Meteorological Observation Center, China Meteorological Administration, Beijing, China
  • 8Training Center, China Meteorological Administration, Beijing, China
  • 9School of Atmospheric Sciences/Plateau Atmosphere and Environment Key Laboratory of Sichuan Province/Joint Laboratory of Climate and Environment Change, Chengdu University of Information Technology, Chengdu, Sichuan Province, China

Abstract. Eastern China (EC), located on the downstream region of Tibetan Plateau (TP), is a large area that has become vulnerable to frequent haze. In addition of air pollutant emissions, meteorological conditions were a key inducement for air pollution episodes. Based on the study of the Great Smog of London in 1952 and haze pollution in EC over recent decades, it is found that the abnormal warm cover in the middle troposphere, as a precursory strong signal hidden, could connect to severe air pollution events. The convection and diffusion in the atmospheric boundary layer (ABL) were suppressed by a relatively stable structure of warm cover in the middle troposphere, leading to the ABL height decreases, which were favourable for the accumulation of air pollutants in the ambient atmosphere. The warming TP built the warm cover in the middle troposphere from the plateau to the downstream EC region and even the entire East Asian region. The frequent haze events in EC is connected with a significantly strong warm cover in the interdecadal variability. It is also revealed that a close relationship existed between interannual variations of the TP's heat source and the warm cover hidden in the middle troposphere over EC.

Xiangde Xu et al.

Status: open (extended)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2020-1140', Anonymous Referee #1, 27 Feb 2021 reply
    • AC1: 'Reply on RC1', Wenyue Cai, 08 Mar 2021 reply

Xiangde Xu et al.

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Short summary
We found that the structure of atmospheric thermodynamics in the troposphere can be regarded as a strong forewarning signal for the variations of surface PM2.5 concentration in heavy air pollution.
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