Simulation Of The Distribution Characteristics Of Pollutant In Shenyang City’s Heavy Pollution Process Based On WRF/CALPUFF Model

With the continuous advancement of industrialization and urbanization,atmospheric pollution has become a hot focus of the whole society.Shenyang City is an important old industrial city in China,and the winter heating time is about 150days.The coal smoke pollution is serious,and the spring dust pollution is remarkable.The particulate concentration is high,and the air pollution is severe.Pollution source emissions are the most important factors affecting environmental air quality,reducing pollution source emissions,and improving the primary work of environmental air quality is to carry out effective management of pollution source emissions.Based on the list of air pollution source emissions,this paper analyzes the temporal and spatial variation characteristics of pollutants of different pollution sources.The WRF/CALPUFF/Meteo Info-Trajstat Coupling system simulates the typical pollution weather in March 2018,and explores the emission reduction measures of typical pollution sources in Shenyang.Finally,the potential contamination source region of the pollutant(SO₂,NOx,PM₁₀and PM_2.5)is analyzed.The results are as follows:（1）SO₂,NOx,PM₁₀and PM_2.5total emissions from industrial source,civil source,dust source,mobile source and biomass combustion source in 2018 are:5.58×10~4t/a,14.13×10~4t/a,15.80×10~4t/a and 9.03×10~4t/a.The contribution rate of industrial source on SO₂is as high as 62.76%.The contribution rate of mobile sources on NOx is as high as 55.95%.Dust source is the largest contribution source of PM₁₀,with a contribution rate of 54.12%.The industrial source is the largest contribution source of PM_2.5.It is 34.89%.（2）CALPUFF model is used to simulate a typical pollution weather process from March 21 to 28,2018.R~2of simulated concentration and monitored concentration of SO₂,NOx,PM₁₀and PM_2.5are 0.8117,0.5908,0.6225 and 0.8497,respectively,SO₂,NOx,PM₁₀and PM_2.5have high concentrations on 23 and 24,and pollution is mainly concentrated in the main urban area,west of the main urban area,and the junction of Kangping County,Faku County.The emission reduction method for the fixed combustion source of typical pollution source-fossil fuel in Shenyang City is inquired.SO₂,NOx,PM₁₀and PM_2.5are 22210.23t,22476.44t,17790.59t,and12702.01t,respectively."Coal to gas"is the most significant reduction in the reduction of SO₂,PM₁₀and PM_2.5of industrial enterprises,and the reduction rate is99.48%,99.21%and 98.77%.（3）Apply the Meteo Info-Trajstat software,trace the source of Shenyang pollution from the March 21st to 28th and determine the potential source area through the trajectory clustering analysis,PSCF method,and CWT method.The results show that the WPSCF and WCWT values in the NOx mesh area are lower,this may be Since the local pollution source in Shenyang is the main pollution source of NOx.Shenyang SO₂source is more local,the PM₁₀’s WPSCF and WCWT highly coincident region is the Liaoning Province,Fuxin City,Jinzhou City,Beijing-Tianjin-Hebei area,Tianjin City,Tangshan City,Qinhuangdao City,Inner Mongolia Autonomous Region,Tongliao City,etc.PM_2.5’s WPSCF and WCWT highly coincided into Fuxin City,Chaoyang City,Jinzhou City,Tianjin City,Tangshan City,Qinhuangdao City,Inner Mongolia Autonomous Region,Tongliao City,Chifeng City,etc.