Insights into the phenomenon of an explosive growth and sharp decline in haze: A case study in Beijing
作者： Wenguang Li , Xingang Liu , Yuanhang Zhang , Qinwen Tan , Miao Feng
DOI: 10.1016/J.JES.2019.04.015
关键词: Planetary boundary layer 、 North china 、 Environmental science 、 Atmospheric sciences 、 Explosive material 、 Haze 、 Particulates 、 Pollutant 、 Beijing 、 Water vapor 、 Environmental engineering 、 General Environmental Science 、 Environmental chemistry 、 General Medicine
摘要: Abstract A severe haze episode occurred in winter the North China Plain (NCP), and phenomenon of an explosive growth sharp decline PM2.5 (particulate matter with aerodynamic diameter equal to or less than 2.5 μm) concentration was observed. To study systematic causes for this phenomenon, comprehensive observations were conducted Beijing from November 26 December 2, 2015; during period, meteorological parameters, LIDAR data, chemical compositions aerosols determined. The characterized by rapidly varying concentration, highest reached 667 μg/m3. During episode, NCP dominated a weak high-pressure system continuously low PBL (planetary boundary layer) heights, which are unfavorable conditions diffusion pollutants. large increases concentrations SNA (SO42−, NO3− NH4+) implied that formation largest contribution. Water vapor also played vital role promoting transformation secondary pollutants, led higher concentrations. spatial distributions at different times backward trajectories air masses indicated pollutants surrounding provinces particular, contributed concentration.
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