HYSPLIT and MeteoInfo models were used to calculate the backward airflow trajectory arriving in Chenzhou area for 72 h in autumn and winter from 2017 to 2021,and trajectory cluster,potential source contri-bution factor(PSCF)and concentration weight trajectory(CWT)analysis were carried out to explore the trans-port characteristics and potential source distribution of PM2.5.The results showed that the potential source areas of PM2.5 in autumn and winter in Chenzhou were mainly distributed in the northeast direction,short-distance transport dominated.The highest frequency was the short distance trajectory from Tongcheng County,Xianning,to Pingjiang County,Yueyang,and Zhuzhou area,which was 34.17％.The WPSCF high value belt originated in Henan,passed through Hubei,Pingjiang,Jiangxi,and finally reached Chenzhou.The WCWT analysis re-sults showed that the trend of PM2.5 pollution was consistent with the above,affecting a wider area and a relative-ly light degree.The impact of pollution transport in Chenzhou area decreased year by year,PM2.5 concentration decreased by 19.7％on average.
关键词
PM2.5/传输路径/潜在源贡献/后向轨迹/聚类分析/秋冬季/郴州地区
Key words
PM2.5/Transport path/Potential source contribution/Backward trajectory/Cluster analysis/Autumn and winter/Chenzhou area
万方数据