Abstract：In order to explore the impact mechanism of fog on the PM2.5 concentration during the process of the fog-haze, the multi-source observation data such as automatic meteorological station data, environmental hourly concentration data, microwave radiation data, wind profile radar, aerosol lidar, 255m meteorological tower data and WRF-Chem process analysis method were used to analyze the role of advection-radiation fog on the PM2.5 in Tianjin from January 24 to 27, 2021. The results show that: The increasing in relative humidity during fog formation phase is attributed to the radiative cooling and advection, indicating that the fog type is advection-radiation fog. The water vapor was transported from top to down during the formation of fog. The fog-top height was 250m, and the bottom of the inversion layer height was 80~120m, so the fog-top height was higher than inversion layer bottom height during the process of the fog. Because the role of the relative humidity、vertical advection and turbulent mixing before fog formation, the PM2.5 mass concentration of the ground and vertical direction was growth first then slowed again, and the overall benefit of PM2.5 mass concentration was diffusion. According to the inversion layer bottom height, there were two situations of the role of fog on the PM2.5 during the fog mature period. One was removing PM2.5 when the fog height was higher than the bottom height of inversion. The other was scavenging PM2.5 When the fog height was lower than the bottom height of inversion. The turbulent kinetic energy was active after fog dissipation, turbulent mixing amount of contribution -40~-23μg/(m3·h), fog was conducive to the ground PM2.5 mass concentration diffusion.
孟丽红, 杨二辉, 蔡子颖, 郝囝, 杨健博. 基于多源资料和数值模拟的雾对PM2.5影响研究[J]. 中国环境科学, 2023, 43(4): 1510-1518.
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