Study On The Spatial And Temporal Distribution Of Major Air Pollution And The Influential Character Of Meteorology In ZhenJiang District

Atmospheric environment has a profound impact on people's production and life.At present,most of the domestic air pollutant research areas are distributed in North China and the Pearl River Delta region,and there are few in the Yangtze River Delta region.Zhenjiang,an important city in southern Jiangsu,lacks real and effective air pollutant data.Air pollution control lacks certain specificity.In order to figure out the changes of major atmospheric pollutants and sources of pollutants in Zhenjiang area,and study the formation mechanism of heavy pollution weather,providing basic data basis and theoretical support for air pollution and haze prevention,based on the atmospheric pollutant concentration data and meteorological data of Zhenjiang Air Quality Automatic Monitoring Station in 2017,this paper analyzes the temporal and spatial variation characteristics of various pollutants in Zhenjiang City and its relationship with meteorological conditions.Research shows:?1?The annual variation of O3 in Zhenjiang City is double peak Type,June and August are two peaks,the lowest in December;PM_2.5,PM₁₀,NO₂,CO and SO₂ are both high in winter and autumn,and low in summer;O₃ and SO₂ are unimodal in the daily change The peaks are located at 13 o'clock in the afternoon and 10 o'clock in the morning,and the rest are bimodal,with peaks in the morning and evening peaks.In the weekly variation of concentration,the highest value of O₃ appeared on Tuesday,and the peaks of other pollution were on Friday,Saturday and Sunday;The spatial distribution of various pollutants in Zhenjiang City showed a large difference,among which PM_2.5,PM₁₀,NO₂ and O₃ all show that the western region is higher than the eastern region,while the CO is higher in the eastern region and lower in the central and western regions.?2?There is a big difference in the correlation between different pollutants and different seasons and meteorological elements,in terms of significant degree and correlation size.There are big differences in aspects.In summary,the correlation between wind speed,temperature and air pressure on the daily average concentration of pollutants is greater than the correlation between humidity and precipitation and the daily average concentration of pollutants;The correlation between concentration of SO₂ and NO₂ with wind direction is significant,and wind direction has a greater impact on it.Big.The daily average concentrations of CO,O₃,PM_2.5 and PM₁₀ pollutants were less affected by wind direction,and the correlation was not significant;When the wind speed is less than lm?s^-1,the four pollutants of SO₂,NO₂,PM_2.5 and PM₁₀ increase linearly with the increase of wind speed;When the wind speed is greater than 1 m?s^-1,The concentration of that four pollutant decrease logarithmically with the wind speed;The concentration of O₃ increases logarithmically with the increase of wind speed;The concentration of CO decreases linearly with the increase of wind speed;therefore,when the wind speed is greater than 6m?s^-1,the concentration of all pollutants present the discrete distribution and complex correlation.There is a significant seasonal variation in the maximum mixed layer height.There are two main peak periods for the height of the mixed layer,which are Feb-Apr months and Jul-Oct.Seasonal changes are significant,with the maximum mixed layer height from high to low in summer,spring,autumn and winter.?3?The continuous haze weather in the Zhenjiang winter is affected by meteorological conditions,and it is necessary to meet the static wind or the wind speed is less than 2m?s^-1,also need the existence of the inversion layer near the ground;By the backward trajectory of pollutants,a large number of pollutants in the early stage of the haze explosion came from the North China Plain and Shandong,and during the outbreak most of the pollutant are generated locally.?4?Judging from the comprehensive treatment of air pollution,the concentration of pollutants in spring and winter is relatively high.It is necessary to strengthen the prevention and control of atmospheric pollutants in these two seasons,especially the control of local key pollution sources,and also need to cooperate with the surrounding environmental departments to prevent and cure.The source of pollution presents a trend that requires coordinated upstream treatment of pollutants.From the perspective of daily management,the concentration of pollutants in the morning and evening of the working day is large.It is necessary to strengthen the monitoring of vehicle exhaust and factory emissions.Furthermore,some of the environmental monitoring network and the air pollution simulation system are not mature.It is urgent to establish a comprehensive evaluation system that can simulate a series of situations such as flow,emissions and pollution spread,and provide a certain decision-making reference for pollution control.