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| Study on the formation mechanism of an ozone pollution event in Northeast Qinghai |
| DOU Xiao-yan1, GAO Hai-peng1, CHEN Ke1, ZHANG Zhi-jun1, XU Xun1, LI Ming-ge2, TAO Jing-hua2, CHEN Liang-fu2,3 |
1. State Environmental Protection Key Laboratory of Tibetan Plateau Eco-Environmental Monitoring and Assessment, Qinghai Key Laboratory of Eco-Environmental Monitoring and Assessment, Qinhai Eco-environmental Monitoring Center, Xining 810007, China;
2. State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute Chinese Academy of Sciences, Beijing 100101, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Based on surface observation, satellite and reanalysis data, an ozone pollution process from July 25th to August 3 rd, 2021 in northeast Qinghai was analyzed. The results showed that the ozone concentration of each site gradually increased since July 26 th. A large-scale persistent regional pollution evolved from July 30 th to August 2 nd, with the regional averaged ozone concentration 20.9% higher than the monthly average. On the one hand, the surface radiation of the region was strong during this period, the temperature rose significantly, and the average increase of the sites exceeded 10℃, which is conducive to photochemical reactions of the ozone production. At the same time, the surface diffusion conditions were poor due to the continuous weak wind speed, causing the accumulation of pollutants. On the other hand, the region was mainly controlled by strong downdraft on the upper air and decreased relative humidity at surface from July 26 th to 31 st. The ozone concentration increased significantly, with the concentration exceeding 170μg/m3 at 55.7% of the sites in the peak of pollution. The obvious effect of ozone vertical transport from the top of troposphere to near surface is the immediate cause of ozone pollution of the region.
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Received: 30 November 2022
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