Vertical profiles and regional transport of ozone in typical area of Yangtze-Huaihe River Basin during the autumn base on multiple lidars

In recent years, the Yangtze-Huaihe River Basin has become one of the key areas of air pollution control in China, however, there are some differences in the spatial and temporal characteristics of ozone in different cities. In order to explore the vertical structure characteristics of ozone in Yangtze-Huaihe River Basin and its influencing factors, this study analyzed the vertical and horizontal distribution of ozone in typical cities in the Yangtze-Huaihe River Basin in October 2021 by using differential absorption lidar(DIAL), temperature and humidity profile lidar and wind profile radar system, studied two typical ozone pollution processes, and the meteorological factors of ozone pollution at vertical height. The results showed that the ozone pollution was mainly produced locally from October 13 to 14, while the ozone pollution was affected by local production and transport from October 21 to 31, the average ozone concentration reached a maximum of 357.6 μg/m3. There is a significant residual layer at night. The temperature of 272.85–285.88 k and water vapor mixing ratio of 3.22–5.7 g/kg are favorable for ozone generation in Huaibei City. The ozone contribution of Henan, Shandong and Anhui to Huaibei City is above 200 μg/m3. The study on the vertical structure of ozone is helpful to fill the knowledge gap between the evolution of ozone events in Yangtze-Huaihe River Basin. •Multiple lidar units were used to measure pollutants in Huaibei City.•Local pollution and transport of ozone have different characteristics in the vertical height of troposphere.•Updrafts cause residual ozone in the upper air at night.•Long-distance ozone transport sources are mainly distributed in Jiangsu, Shandong and Anhui provinces.