Abstract：The key factors and sources of ozone pollution in Jiaodong Economic Circle under different weather patterns were studied based on the ozone observation and reanalysis data from 2014 to 2021. Results show that there are four types of weather patterns which are prone to ozone pollution. In the four weather patterns, the upper level is all controlled by the northwesterlies behind the westerly trough, while the surface is dominated by low-pressure trough in the northeastern China, weak anticyclone, rear of offshore high-pressure, and continental high-pressure. The number of ozone pollution days under the four weather types accounted for 58%, 28%, 6% and 5% of the total ozone pollution days, respectively. The key factors affecting ozone pollution are different under different weather patterns. For the northeast low-pressure trough type, the key factors are associated with the solar radiation, cloud fraction and low-level relative humidity. For the weak anticyclone type, the ozone is mainly correlated with solar radiation, cloud fraction, low-level relative humidity and zonal winds. For the rear of offshore high-pressure type, the ozone is mainly associated with solar radiation, cloud fraction, low-level temperature and relative humidity. For the continental high-pressure type, the ozone is mainly related to low-level temperature, low-level meridional wind and atmospheric stability. Backward trajectory cluster analysis shows that the occurring of ozone pollution is related to the latitude of the source of the air flow or whether it comes from inland. The ozone pollution in Jiaodong Economic Circle mainly comes from the Shandong Province, Anhui Province, Jiangsu Province and southeastern coastal China. The analysis of a long-lasting ozone pollution process shows that it is favorable for the occurrence and long duration of ozone pollution in the Jiaodong Economic Circle when the weather pattern is controlled by the northwesterly wind behind the trough or high-pressure ridge in the upper level, and by the inland northwesterly or southwesterly flow in the low-level.
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