Analysis of characteristics and meteorological causes of PM2.5-O3 compound pollution in Shanghai
MAO Zhuo-cheng, XU Jian-ming, YANG Dan-dan, YU Zhong-qi, QU Yuan-hao, ZHOU Guang-qiang
Yangtze River Delta Center for Environmental Meteorology Prediction and Warning, Shanghai Key Laboratory of Meteorology and Health, Shanghai 200030, China
Simultaneous pollution events of PM2.5 and O3 (PM2.5-O3 compound pollution) in Shanghai from 2013 to 2017 and the relationship between PM2.5-O3 compound pollution and meteorological conditions were statistically analyzed. In the past five years, PM2.5-O3 compound pollution events accounted for 33.4% of total O3 pollution events in shanghai, which only appeared between March and October and decreased by year. The peak O3 concentration and average O3 concentration during PM2.5-O3 compound pollution were higher than those during simplex O3 pollution. The duration of O3 pollution during PM2.5-O3 compound pollution events was longer than that of simplex O3 pollution. The main meteorological reasons were ground convergence and low boundary layer height. The weather situation of PM2.5-O3 compound pollution was related to weak pressure field, which was categorized into 5weather types, namely bottom of low pressure, front of low pressure, top of high pressure, rear of high pressure and equalized pressure. The equalized pressure mostly appeared, which accounted for 53%. The PM2.5-O3 compound pollution required strict meteorological threshold ranges, which were more conductive to PM2.5 concentration increasing than to O3 concentration increasing. When the temperature was between 27.9~34℃, the humidity was between 43%~58%, the wind speed was between 2.1~3.3m/s, the height of the mixed layer was between 1122~1599m, and when there was convergence, it was the most conductive to the occurrence of PM2.5-O3 compound pollution.
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