Analysis of Ozone Temporal and Spatial Variation Characteristics and Meteorological Factors in Nanjing
Based on the data of Nanjing automatic air monitoring network from 2016 to 2022,the spatial and temporal distribution characteristics and the influence of meteorological factors on O3 in Nanjing were analyzed in detail.The results showed that the proportion of days with O3-8 h exceeding the standard from 2016 to 2022 had significantly increased by 32.3 percentage points.The months with O3 pollution had increased from April to September to March to November.The daily variation of O3 concentration showed a unimodal pattern,with the peak postponing from 15:00 to 16:00.The duration of O3 pollution had increased,and the average hourly concentration of O3 in each time period from 2019 to 2022 was higher than that from 2016 to 2018,ranging from 1 to 10 μg/m3,indicating an overall increase in O3 pollution.The average annual increase of O3-8 h in the northern suburban areas from 2016 to 2022 was about 8.7 μg/m3 and that in the southern suburban areas was about 5.6 μg/m3,both higher than the city's average annual increase of 0.5 μg/m3.The average annual increase of the number of days with O3 exceeding the standard in the northern suburban areas was about 7 days,and that in the southern suburban areas was about 5 days,both higher than the city's average annual increase of 2 days.When the temperature exceeded 27℃,the O3 exceeding standard rate increased rapidly.The O3 exceeding standard rate was the highest with the temperature range of(30,35]℃,exceeding 50%.When the temperature was less than 33℃and the relative humidity was less than 40%,the average concentration of O3 and the rate of exceeding the standard would increase with the increase of the air temperature and relative humidity.When the temperature was more than 35℃and the relative humidity was more than 60%,the average concentration of O3 would decrease with the increase of the air temperature and relative humidity.When the wind speed was in the range of(4,5]m/s,and the wind direction was SE and S,the O3 excess rate and average concentration were the highest.
O3temporal and spatial evolutionclassification of diurnal variationmeteorological factors
NETL
NSTL
万方数据
