| In order to understand the regularity of ozone generation,development and diffusion in Shenyang,the spatial and temporal distribution characteristics and influencing factors of O3were studied by using the O3 concentration and other pollutant concentration and meteorological data of 11 monitoring stations in Shenyang from 2015 to 2017.The present situation of O3 pollution was simulated by using WRF-Chem model.The main conclusions drawn in this paper are as follows:?1?From 2015 to 2017,the days exceeding the daily maximum 8-hour average concentration of O3 were 30,34 and 39 days,respectively.The days exceeding the standard of O3 showed an increasing trend,and O3 exceeded the standard mainly in May-August.The seasonal distribution of O3 in Shenyang is obvious,summer>spring,autumn>winter,and the daily variation of O3 shows peak concentration around 15:00 a.m.per day.The weekend effect of O3 was not obvious,and the concentration of O3 in working days was slightly higher than that in weekends.In terms of regional distribution,the spatial distribution of O3 shows that the concentration of urban center is lower than that of the periphery of the city.?2?The simulation results of WRF-Chem model show that the present situation of O3pollution in Shenyang presents pollution characteristics.The simulation results show that the regularity of O3 pollution in Shenyang is consistent with that of monitoring data analysis.The distribution of O3 is strip-like.The concentration of O3 in urban center is lower than that in urban periphery.The actual monitoring data verifies the analysis results.?3?O3 concentration is greatly influenced by other major pollutants and meteorological factors.O3 was negatively correlated with SO2,NO2 and CO,and the correlation coefficients were?0.39,0.4004 and 0.139?,respectively.Particulate matter concentration affected light intensity and then O3 concentration.Wind speed plays a dominant role in the diffusion rate of O3 concentration,and wind direction plays a dominant role in the direction of O3 plume dispersion;there is a negative correlation between humidity and O3 concentration,with a correlation coefficient of 0.13;there is a positive correlation between temperature and O3concentration,with a correlation coefficient of 0.39;low-pressure and stable weather is conducive to the formation of O3.?4?O3 pollution control in Shenyang area is a comprehensive control.From the perspective of influencing factors,the most important thing is to control the emission of VOCs and NOx,the precursor,and to establish a high-precision emission inventory of pollutants in Shenyang area,especially the emission inventory of VOCs and NOx main control factors,so as to solve the problem of O3 pollution pertinently. |
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