Spatial and Temporal Distribution Characteristics and Potential Sources of Ozone in Shijiazhuang City
Based on the monitoring data from 261 ambient air quality automatic monitoring stations in Shijiazhuang from 2020 to 2021,the inverse distance weighted interpolation method,spatial autocorrelation and backward trajectory model were used to analyse the frequency of ozone exceedances in the study area,the spatial and temporal distribution characteristics and the ozone aggregation status and sources within the study area.The results showed that compared with 2020,the rate of ozone exceeding the standard in Shijiazhuang counties in 2021 had decreased to varying degrees,among which Xingtang County had the largest decline.The monthly variation of ozone concentration was inverted"V"shape,with the highest concentration in summer,followed by spring and autumn,and the lightest in winter.Spatial distribution of ozone in the study area was characterized by high in the central and western regions and low in the eastern.In 2020,the ozone concentration in the study area exceeded the standard seriously,most of the central and western regions exceeded 190 μg/m3,and the rest exceeded 160 μg/m3.In 2021,except for a few monitoring sites with ozone concentration higher than 190 µg/m3,athe ozone concentration in the central and western regions of the study area decreased,and the ozone concentration in most sites in the eastern region was lower than 160 μg/m3.The results of backward trajectory analysis show that the ozone pollution air mass mainly comes from Baoding in the northeast of the study area,Xingtai in the south and Xinzhou in the northwest.Ozone accumulates in the air mass transmission,resulting in high concentration.The potential pollution sources are basically consistent with the concentration weight trajectory range,and the contribution of potential source area pollution is relatively small.Through the analysis of ozone concentration changes in 2020 and 2021,it can be seen that the ozone pollution in the study area has gradually reduced,and ozone pollution control should focus on summer,and the control of pollutant sources in the south and northeast cities of the study area should be strengthened.
Shijiazhuangozonespatial and temporal distributionspatial autocorrelationbackward trajectory
NETL
NSTL
万方数据
