Abstract:

Based on the data of O₃ concentration at the southern foot of Taihang Mountains (i. e. Jincheng city, Shanxi province) and the total solar radiation from 2015 to 2019, the temporal and spatial variation characteristics of O₃ concentration and its relationships with meteorological factors such as wind, relative humidity, precipitation, haze, temperature, and solar radiation were analyzed. The conclusions are as follows: the O₃ concentration increases year by year. Its concentration in summer is significantly higher than that in winter. The monthly variation of O₃ concentration is unimodal. The results show that the peak value appears in June and the valley value appears in January, and the diurnal variation is higher in the daytime than that in the night. The spatial distribution of O₃ concentration has obvious regional differences, showing the characteristics of high in the middle and south, low in the East and West and North, i. e., showing the characteristics consistent with the climate tendency rate. When the wind speed is less than 1.5 m·s^-1, the rising rate of O₃ concentration is faster, and when the wind speed is larger than 2.5 m·s^-1, the concentration of O₃ decreases rapidly. The concentration of O₃ is negatively correlated with relative humidity, and the peak appears in the region with 30%-70% relative humidity. The influence of precipitation with different ranks on O₃ concentration is quite different. The concentration of O₃ is lower in moderate rain and higher in other ranks. The concentration of O₃ during the day without precipitation is significantly greater than that during the day with precipitation. When there is haze, the concentration of O₃ is significantly lower than that without haze. The positive correlation between O₃ concentration and temperature is very obvious. There is also a positive correlation between O₃ concentration and solar radiation, but the correlation level is lower than that with temperature.

Key words: O₃ concentration, Meteorological factors, Climate tendency rate