Weather Classification and Potential Source Areas Analysis of PM2.5 Pollution in Qingyuan City
Based on the air quality monitoring data and correlative meteorological data in Qingyuan City from 2016 to 2021,the characteristics of meteorological elements and potential pollution source areas under different PM2.5 pollution weather patterns in Qingyuan were analyzed using statistical analysis,subjective weather classification and HYSPLIT model,which provides effective reference for fine management on air pollution prevention and control.The results indicated that:The PM2.5 pollution in Qingyuan mainly occurs in non-precipitation or micro-precipitation weather when the daily average wind speed is less than 2 m/s,the average relative humidity is between 75%and 90%and the average temperature is between 18～22℃.The typical weather types causing PM2.5 pollution in Qingyuan are transformed cold high ridge,frontal low trough and behind ridge,front of cold front,weak cold high ridge,south-west to high and peripheral subsidence of typhoon.The heavy PM2.5 pollution only occurred under the control of the weak cold high ridge weather pattern in autumn and winter;the frequency of the slight and moderate PM2.5 pollution is the highest under transformed cold high ridge weather conditions;frontal low trough and behind ridge is the main weather type that causes PM2.5 pollution of Qingyuan City in spring;and the pollution is relatively low under front of cold front,south-west to high and peripheral subsidence of typhoon.HYPLIT trajectory clustering analysis shows that the main airflow trajectories aggravating PM2.5 pollution in Qingyuan are southerly airflow and north-south airflow convergence.The potential source areas of PM2.5 pollution are mainly located in Qingyuan urban area and Pearl River Delta cities such as Guangzhou,Foshan,Dongguan,Jiangmen,etc under the control of southerly airflow,and south of Qingyuan,Shaoguan and the Pearl River Delta,where under the control of south-north airflow convergence,are the potential areas of PM2.5 pollution,long-distance transportation in the north direction will be weaken by the blocking effect of the Nanling Mountain.
PM2.5Qingyuan CitySubjective weather classificationHYSPLIT modelPotential source area
NETL
NSTL
万方数据
