Study On Pollutant Transmission Path And Conveying Channel In Beijing-tianjin-hebei Area Based On CMAQ Model

In recent years,with the rapid development of economy,science and technology and information industry in Beijing-Tianjin-Hebei,people's living standards and quality of life have also been significantly improved,but the urban agglomeration effect of breeding has made the problem of air pollution more and more prominent,the occurrence of haze weather,Both the decline in air quality and visibility has become one of the important issues facing the Beijing-Tianjin-Hebei areas.Based on the emission inventory data,air quality data and meteorological data of atmospheric pollution sources,this study makes real-time analysis by using CMAQ quality model,HYSPLIT trajectory model and meteorological data,and studies the spatial distribution,transmission path and conveying channel of pollutants in the air pollution situation in Beijing-Tianjin-Hebei areas.It provides scientific basis for the joint control of Atmospheric pollutants in Beijing-Tianjin-Hebei areas.It provides scientific basis for joint control of Air pollutants in Beijing-Tianjin-Hebei areas.Using pollutant emission inventory data,the spatial distribution and wind field of pollutants in the Beijing-Tianjin-Hebei region are simulated by CMAQ air quality model,and the transportation trajectory of pollutants in the atmosphere heavy polluted weather is simulated.This paper simulates the spatial distribution of the pollutant concentration in the Beijing-Tianjin-Hebei region,and determines the distribution of the wind field from southwest to northeast in Shanxi,Henan and the south of Beijing-Tianjin-Hebei region,and simulates the transport trajectory of the pollutants in Beijing-Tianjin-Hebei region by HYSPLIT trajectory model.Using the meteorological monitoring data,a real-time simulation of wind field data is carried out through clustering analysis method for the formation,maintenance and dissipation of heavy polluted weather.The HYSPLIT model is used to simulate the trajectory of airflow in the 300 m height of Beijing,under extreme weather conditions,the atmospheric heavy polluted weather in the Beijing-Tianjin-Hebei region is 80% affected by the southwest direction,and the transportation trajectory of air pollutants is mainly transported from south to north direction.Through air quality monitoring data,Pollutant emission inventory data and CMAQ air quality model to determine the spatial distribution of pollutants in the Beijing-Tianjin-Hebei area and air quality zoning,the air quality model determines the three-dimensional spatial transmission path of the pollutants in the Beijing-Tianjin-Hebei region and the conveying channel,the results show that the distribution of pollution in the Beijing-Tianjin-Hebei region is mainlyin the southern region.Its dividing line was initially identified as the junction area of Taihang and Yanshan Mountains,the area south of which was a region of concentrated pollutant concentrations.