Fog scavenging of particulate matters in air pollution events: Observation and simulation in the Yangtze River Delta, China

薄雾 清除 天气研究与预报模式 环境科学 大气科学 微粒 空气污染 污染 行星边界层 边界层 平流 沉积(地质) 气溶胶 气象学 化学 地质学 地理 湍流 生态学 古生物学 生物化学 物理 有机化学 沉积物 生物 抗氧化剂 热力学
作者
Junlong Qian,Duanyang Liu,Shuqi Yan,Muning Cheng,Rongwei Liao,Shengjie Niu,Wenlian Yan,Shuyao Zha,Lulu Wang,Xiaoxiao Chen
出处
期刊:Science of The Total Environment [Elsevier BV]
卷期号:876: 162728-162728 被引量:8
标识
DOI:10.1016/j.scitotenv.2023.162728
摘要

Stable atmospheric boundary layer is conducive to the accumulation of atmospheric pollution and the occurrence of fog, and fog has a removal effect on air pollution. In this study, we use the observation and WRF-Chem (Weather Research and Forecasting Model with Chemistry) simulation to analyze the factors affecting the removal efficiency in a continuous fog and haze episode from November 26 to 28, 2018 in Jiangsu Province, such as fog thickness and duration. The results show that the WRF-Chem simulation well reproduces the boundary layer characteristics in the stages of fog formation, development and dissipation. The atmospheric boundary layer provides favorable conditions for the maintenance of fog and air pollution. The inversion layer, with the maximum intensity of 3 °C per 100 m, creates favorable thermal conditions, and the water vapor advection is also conducive to the fog maintenance. The ground observation verifies the wet scavenging of PM2.5 during dense fog events. The scavenging effect is related to the fog duration, and the correlation is positive when the fog is just formed and negative when the fog is dissipating. The PM2.5 concentration decreases from 159 μg m-3 to 38 μg m-3 after the fog lasts for 11 h. The fog has a remarkable scavenging effect on PM2.5 in the vertical direction, due to the deposition effect of fog droplets on the pollutant particles. The PM2.5 concentration on the ground is lower than the vertical average in the fog area, and the scavenging effects during the dense fog periods on November 27 and 28 are 47.7 μg m-3 and 36.1 μg m-3, respectively. The fog duration is mostly concentrated in 3-17 h. When the duration of fog is 4-8 h, the scavenging effect on PM2.5 reaches the strongest, with an average PM2.5 concentration decrease of >70 μg m-3.
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