Yingxiao Tang1, Suqin Han 1, Qing Yao1, Ziying Cai1, Yulu Qiu2, Jin Feng3

Tianjin Environmental Meteorological Center, Tianjin 300074, China
Environmental Meteorology Forecast Center of Beijing-Tianjin-Hebei, China Meteorological Administration, Beijing 100089, China
Institute of Urban Meteorology, China Meteorological Administration, Beijing 100089, China



Download Citation: ||https://doi.org/10.4209/aaqr.2019.11.0567 


Cite this article:

Tang, Y., Han, S., Yao, Q., Cai, Z., Qiu, Y. and Feng, J. (2020). Analysis of a Severe Regional Haze-fog-dust Episode over North China in Autumn by Using Multiple Observation Data. Aerosol Air Qual. Res., https://doi.org/10.4209/aaqr.2019.11.0567


HIGHLIGHTS


  • Analysis of haze-fog-dust event could improve the understanding of air pollutions.
  • The cold air with dust did not improved air quality in southern part of north China.
  • The dust might promote the fine particle production in downstream area.
 

ABSTRACT


The mixing of dust and haze is an important factor that influences fine particle variation. In this study, multiple observation data were used to analyze the characteristics and formation process of the haze-fog-dust event from November 23 to 30, 2018, in North China. The variations in air quality in North China from November 23 to 30 can be roughly divided into two periods, haze-fog and dust, separated by November 27. The analysis shows that the stable weather and temperature inversions in North China caused the haze-fog event and that the PM2.5 concentration gradually increased from November 23 to 26. After November 27, cold air accompanied with the dust activities affected the northern part of North China, which improved the meteorological conditions. However, the cold air did not improve the weather conditions in the central and southern parts of North China. The continuous adverse meteorological conditions and dust backflow that retained dust aerosols in the southern part of North China for nearly two days were responsible for the high PM2.5 concentrations in Jinan and Zhengzhou after November 27 (146 and 156 μg m-3, respectively), which were higher than those before November 27 (114 and 144 μg m-3, respectively). This study highlights the importance of dust transport in the autumn and winter to regional environmental pollution.





Impact Factor: 2.735

5-Year Impact Factor: 2.827


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