TITLE:
Analysis of a Haze Weather Process in Eastern China from November 11th to 17th, 2020
AUTHORS:
Lihe Ma
KEYWORDS:
Haze, Fog and Smog, North China, Meteorological Conditions, Air Pollution
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.10 No.10,
October
31,
2022
ABSTRACT: This study mainly introduces a large-scale heavy haze weather process in
northern China from November 11 to 17, 2020, and analyzes the weather process. Methods such as
comparative analysis and data analysis were used in this study. The main reasons for the
formation of smog are as follows. First, the relative humidity is high and the
water vapor content is relatively high. Second, the atmosphere is in a static
and stable state, and suspended particulate matter in the atmosphere is not
easy to diffuse and dilute, so it will gradually accumulate in urban areas and
suburban areas. Third, there is a temperature inversion in the vertical
direction, and the suspended particles in the air are difficult to drift to
high altitudes and are blocked at low altitudes and near the ground. Fourth,
there must be cooling conditions. Meteorological factors are the external
causes for the formation of smog. And inversion intensity has a negative
correlation with visibility, which has some indicating importance in fog and
haze predictions. Large-scale haze weather mainly occurs in the large-scale
atmospheric circulation with weak cold air and good water vapor conditions, and
wind near the ground is small. Due to the high humidity in haze weather, fog
droplets provide adsorption and reaction sites, accelerating the conversion of
gaseous pollutants to liquid particles. At the same time, particles are also
easy to act as condensation nucleus to accelerate the generation of haze. When
the two interact, the pollutants are not easy to diffuse outward, resulting in
agglomeration effect, and the pollution is getting heavier.