Impact of synoptic patterns on regional ozone pollution in Sichuan Basin
YANG Xian-yu1, LU Ya-qiong2, WANG Yu-run1, QIAO Yu-hong3, ZHANG Gong-liang1, WANG Shi-gong1, ZHANG Xiao-ling1, LIU Zhi-hong1, LIU Yi-lin1,4, ZHU Xin-sheng5
1. Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China; 2. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China; 3. Sichuan Academy of Environmental Sciences, Chengdu 610000, China; 4. Chinese Academy of Meteorological Sciences, Beijing 100081, China; 5. Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing 210042, China
Abstract:The features of regional O3 pollution and its relationship between synoptic patterns in Sichuan Basin during 2014~2019 were quantitatively analyzed based on the ambient measurements, ERA5 reanalysis data as well as the PCT objective classification method. The frequency of regional O3 pollution in the Sichuan Basin during 2014~2019 showed a unimodal distribution with the highest frequency in 2016. The Chengdu Plain was the most polluted region with elevated O3 levels in the Sichuan Basin. Among the six classified synoptic patterns, Type1, 2, 6 were classified as polluted synoptic patterns which exhibited a western-eastern pressure gradient. Meanwhile, the Sichuan Basin was controlled by a low-pressure system in these synoptic patterns. In contrast, Type3 and Type4 were identified as clean synoptic patterns. The sea level pressure in Type3 was high over the northern SCB and low over the southern SCB, with a low-pressure center located at the eastern Sichuan Basin. Unlike Type3, the sea level pressure in Type4 was higher in the east and lower in the west, with some small-scale high-pressure centers distributed in the Tibetan Plateau. The high temperature, low cloud coverage, strong solar radiation, and low relative humidity in Sichuan Basin under the polluted synoptic types were beneficial to the O3 formation. The stagnant conditions in Type1 and the strong regional transport of O3 and its precursors by the prevailing southeast wind fields in Type 2 and 6 were primary processes that leading to the frequent regional O3 episodes occurred in polluted synoptic types. In addition, the prediction method based on synoptic pattern classification showed that the contribution of synoptic patterns on the inter-annual variability of O3 concentration in the Sichuan Basin ranged from 34.8% to 66.3%, with the contribution can even reached more than twice its annual variation of specific city cluster within SCB.
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