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Discussion papers
https://doi.org/10.5194/acp-2018-782
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-782
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 25 Oct 2018

Research article | 25 Oct 2018

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

The Relationship between the Anticyclonic Anomalies in Northeast Asia and Severe Haze in the Beijing–Tianjin–Hebei Region

Wogu Zhong1,2, Zhicong Yin1,2, and Huijun Wang1,2 Wogu Zhong et al.
  • 1Key Laboratory of Meteorological Disaster, Ministry of Education/Joint International Research Laboratory of Climate and Environment Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science & Technology, Nanjing 210044, China
  • 2Nansen–Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China

Abstract. Haze pollution in the Beijing–Tianjin–Hebei (BTH) region has become increasingly more severe and persistent in recent years. To better understand the formation of severe haze and its relationship with anticyclonic anomalies over Northeast Asia (AANA), this research focused on severe haze over the BTH region occurring in December during 2014–2016 and examined the impacts of the AANA. The results indicated that local meteorological conditions were conductive to severe haze (such as weaker surface wind, stronger temperature inversion, lower boundary layer and higher relative humidity) and were all closely related to the AANA. During severe haze episodes, the AANA remained strong in the mid-upper troposphere, which caused anomalous southerly wind and promoted the accumulation of pollutants and moisture in the horizontal direction. The AANA induced anomalous ascending motion over the BTH region from the vertical direction, which restricted clean air from sinking to the surface and directly led to severe haze. The downward transportation of westerly momentum was also restrained, resulting in weaker surface wind, stronger inversion and shallower boundary layer. The indirect circulation between land and sea triggered by the AANA provided a stable source of moisture. Abundant moisture strengthened the development of severe haze by promoting the growth of fine particles and weakening turbulence. The advance and retreat of the AANA corresponded with the emergence and dissipation of severe haze, illustrating that the AANA could be an effective forecast indicator for air quality.

Wogu Zhong et al.
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Short summary
Haze pollution in the Beijing–Tianjin–Hebei region has become increasingly more severe and persistent in recent years.This research focused on severe haze during 2014–2016 and examined the impacts of the anticyclonic anomalies over Northeast Asia. The advance and retreat of the AANA corresponded with the emergence and dissipation of severe haze, illustrating that the AANA could be an effective forecast indicator for air quality.
Haze pollution in the Beijing–Tianjin–Hebei region has become increasingly more severe and...
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