Accumulation Mechanism of PM2.5 and the Causes of Serious Pollution Weather in Suqian City,China
Through the statistics of PM2.5 data of Suqian in the autumn and winter of 2017-2021 and the conventional meteorological observation data of the same period,based on the daily variation characteristics of PM2.5,it is divided into three processes:rapid accumulation,slow accumulation and dissipation according to the concentration change from 15:00 to 23:00.The accumulation characteristics of PM2.5 in Suqian are analyzed from the perspective of the accumulation rate.It is also applied to study the correlation between circulation situation and accumulation rate under the process of heavy pollution weather.The results show that the average accumulation rate of PM2.5 in the rapid accumulation process is 7.14 μg·m-3·h-1;the average accumulation rate of PM2.5 in the slow accumulation process is 3.27 μg·m-3·h-1;the average dissipation rate of PM2.5 in the dissipation process is 5.42 μg·m-3·h-1.The slow accumulation of PM2.5 is characterized by high temperature,high wind speed,low humidity and weak inversion intensity,while the rapid accumulation is the opposite.The potential source areas of PM2.5 during the slow accumulation process are mainly located in northern Jiangsu,Shandong and Hebei,while the main potential source areas of PM2.5 during the fast accumulation process are mainly located in Anhui and Hubei.The fast accumulation process is dominated by the high altitude trough followed by the ground high-pressure front,and the slow accumulation process is dominated by the latitudinal circulation with the homogeneity surface pressure field.
国家科技期刊平台
NSTL
万方数据
