The Cross-regional Influence Of Industrial Elevated Pollution Sources In JiaYuGuan City Based On CALPUFF

Jiayuguan Industrial Park has gathered Jiayuguan City's major industrial atmospheric pollution sources.Air pollutants emitted from high energy consumption and high pollution industrial enterprises in industrial parks not only impact on the atmospheric environment of Jiayuguan's local area but also have seasonal cross-regional impact characteristics on Yumen City and Suzhou District of Jiuquan City.The first step of the article objectively analyze the quality of the atmospheric environment in Jiayuguan City and Suzhou District of Jiuquan City,and the synchronous relationship between changes in atmospheric environmental quality in Jiayuguan City and Suzhou District of Jiuquan City,then using regional meteorological data,after downscaled by the CALMET diagnostic model,analyze the weather conditions in different seasons during the simulation.Second step,through comparative analyses,filter out the WRF model boundary layer parameterization scheme suitable for the study area.Third,examining the simulation effect of the selected CALPUFF model.Based on the above three steps of research results,Using the meteorological field in different seasons of the study area which is simulated by the boundary layer parameterization scheme with the best simulation effect drive CALPUFF model,using Yumen City and Suzhou District of Jiuquan City as study groups,and using Jiayuguan City as control group,to simulate and analyze the cross-regional impact characteristics of air pollutants emitted from major industrial sources in Jiayuguan City in different seasons.The main conclusions of this paper are as follows:?1?Analyzing the quality of the 2016-2017 atmospheric environment in Jiayuguan City and Suzhou District of Jiuquan City,and the synchronous relationship between changes in atmospheric environmental quality in Jiayuguan City and Suzhou District of Jiuquan City,result showed:in the same period,the changes in the air quality index between Jiayuguan City and Jiuquan City is in good synchronicity,indicating that there is a significant synchronous relationship between the quality of the atmospheric environment of Jiayuguan City and Jiuquan City in time and space.And,during the same period,the concentration of atmospheric pollutants O3?PM10andPM2.5 in the two regions have the best synchronization,the synchronization coefficients are 0.91;NO2 is the second,0.73;CO and SO2 is the worst,both being 0.45.?2?In order to filter out the WRF model boundary layer parameterization scheme suitable for Jiayuguan and Jiuquan regions,comparing and verifying the simulation results of WRF model under three different boundary layer parameterization schemes,result showed:the WRF model under the YSU boundary layer parameterization scheme has the best simulation effect on the meteorological fields in Jiayuguan and Jiuquan regions.?3?Using regional meteorological data,after downscaled by the CALMET diagnostic model,analyze the weather conditions in different seasons during the simulation,result showed:the most frequent wind direction at the height of 300 meter in the study area is east wind.In the four seasons,the frequency of static wind in winter is the largest,3.23%,and the smallest in spring,1.08%.The average summer wind speed is the largest,and the fall is the smallest,in the four seasons.The west wind blowing to Suzhou District of Jiuquan City has the highest frequency in winter,6.32%,and the summer is the lowest,3.63%.The east wind blowing to Yumen City has the highest frequency in summer,28.36%,and the winter is the lowest,10.75%.In the study area,the greatest frequency of the temperature inversion occurs in the winter and the lowest in the summer.?4?Examining the simulation effect of the CALPUFF model on the diffusion transport of atmospheric pollutants in the study area,result showed:the synchronization coefficients between the PM2.5 concentration values in Jiayuguan City and Jiuquan City simulated by CALPUFF model and the monitoring values is the best,the synchronization coefficients are 0.52 and 0.66 respectively.The synchronization coefficient of NO is the smallest,which are 0.45 and 0.38 respectively.The simulation effect of the model on long-distance diffusion transmission of atmospheric pollutants emitted from elevated sources in the study area is better than that of near-distance diffusion,and the model has the best simulation effect on PM2.5.Through comprehensive analysis,the CALPUFF model has a good simulation effect on the diffusion of atmospheric pollutants emitted from elevated sources in Jiayuguan City.?5?In order to understand the diffusion transmission of atmospheric pollutants in different seasons,this paper analyze the quarterly average contribution concentration contours map of atmospheric pollutants in the study area in different seasons,results showed:In the winter,the diffusion transmission of the atmospheric pollutants,which emitted from the industrial elevated sources in Jiayuguan City,to the Northern District of Jiayuguan City are the most visible.In the spring,uniform diffusion near the pollution source area of the atmospheric pollutants are the most visible.In the summer,the diffusion transmission of the atmospheric pollutants to East Town of Yumen City are the most visible.In the autumn,the diffusion transmission of the atmospheric pollutants is similar to that of winter,but it is not obvious compared with winter.?6?In order to understand the contribution of atmospheric pollutants across regions during different seasons,this paper calculates the quarterly average contribution concentration of atmospheric pollutants in Jiayuguan City,Suzhou District of Jiuquan City and East Town of Yumen City in different seasons,results showed:Whichever season,atmospheric pollutants have the largest contribution value in Jiayuguan City and the smallest in East Town of Yumen City.In the four seasons,the quarterly average contribution to Jiayuguan City and Suzhou District of Jiuquan City in winter is the largest,and the summer is the smallest.The quarterly average contribution to East Town of Yumen City in summer is the largest,and the winter is the smallest.?7?This paper compute the relative contribution absolute rate of the average contribution concentration of atmospheric pollutants between study groups and control group in different seasons(?_suzhou??_yumen)in order to understand the influence degree of atmospheric pollutants on different regions,results showed:1)In winter,?_suzhou=82.8%,?_yumen=97.4%;In spring,?_suzhou=71.8%,?_yumen-94.1%;In summer,?_suzhou=75.5%,?_yumen=78.1%;In autumn,?_suzhou=81.9%,?_yumen=96.0%.The impact of atmospheric pollutants on Suzhou District of Jiuquan City is most visible in spring and not obvious in winter.The impact of atmospheric pollutants on East Town of Yumen City is most visible in summer and not obvious in winter.2)In winter,spring,and autumn,the impact of atmospheric pollutants on Jiuquan City and East Town of Yumen City is great different,and the impact on Jiuquan City is more visible than in East Town of Yumen City.In the summer,the impact of atmospheric pollutants on Jiuquan City and East Town of Yumen City is not much different,and both have a visible impact.