Articles | Volume 19, issue 16
Atmos. Chem. Phys., 19, 10845–10864, 2019
https://doi.org/10.5194/acp-19-10845-2019

Special issue: Regional transport and transformation of air pollution in...

Atmos. Chem. Phys., 19, 10845–10864, 2019
https://doi.org/10.5194/acp-19-10845-2019

Research article 28 Aug 2019

Research article | 28 Aug 2019

Assessing the formation and evolution mechanisms of severe haze pollution in the Beijing–Tianjin–Hebei region using process analysis

Lei Chen et al.

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The formation mechanism of a severe haze episode that occurred over North China in December 2015, the aerosol radiative impacts on the haze event and the influence mechanism were examined. The PM2.5 increase during the aerosol accumulation stage was mainly attributed to strong production by the aerosol chemistry process and weak removal by advection and vertical mixing. Restrained vertical mixing was the main reason for near-surface PM2.5 increase when aerosol radiative feedback was considered.
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