Characteristics and Meteorological Effects of Ozone Pollution in Jiangsu in 2022
In 2022,the meteorological conditions were relatively abnormal in Jiangsu that the temperature was higher and rainfall was less than usual,resulting in the historic high ozone concentration in Jiangsu.Based on the ozone monitoring data and meteorological element data in 2022,this paper summarized the characteristics of ozone pollution in Jiangsu and analyzed the correlation between the ozone pollution and meteorological elements.The results showed that the ozone pollution process in Jiangsu in 2022 was characterized by early appearance,excessive processes and long duration.In particular,from April to May and July to August,the pollution level was significantly higher than that of the same period last year.From the hourly variation data,the trough values in 2022 were higher than the previous three years,and the peak values were close to 2019.The overall width had exceeded that of the previous three years by 1-2 hours,and the duration of high ozone areas has been prolonged.Ozone concentration was closely related to meteorological elements.In April and May,the higher the temperature,the lower the humidity,the more concentrated ozone exceeded the standard,showing an obvious"inverted triangle"distribution.In July and August,the ozone concentration and meteorological element showed an obvious linear relationship.In terms of wind speed and direction,the high value of ozone pollution in Jiangsu was mainly concentrated in the southerly wind,and the wind speed was between 2～6 m/s.Taking Nantong as an example,there were 9 consecutive days of ozone pollution from August 7 to 15,during which the weather was sunny and hot with little rain.Affected by the"sea and land breeze",the ozone concentration continued to rise,and the phenomenon of"double peaks"and"trailing"appeared in the evening,the ratio of ethylbenzene to m-p-xylene(E/X)continued to be greater than 1 from August 9 to August 15,indicating the existence of long-distance transport and ozone pollution development in Nantong.This paper analyzed the characteristics of ozone pollution and the relationship with meteorological conditions and has great significance to the prevention and forecast the ozone pollution.
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