上海地区PM<sub>2.5</sub>-O<sub>3</sub>复合污染特征及气象成因分析

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Abstract

Simultaneous pollution events of PM_2.5 and O₃ (PM_2.5-O₃ compound pollution) in Shanghai from 2013 to 2017 and the relationship between PM_2.5-O₃ compound pollution and meteorological conditions were statistically analyzed. In the past five years, PM_2.5-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 PM_2.5-O₃ compound pollution were higher than those during simplex O₃ pollution. The duration of O₃ pollution during PM_2.5-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 PM_2.5-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 PM_2.5-O₃ compound pollution required strict meteorological threshold ranges, which were more conductive to PM_2.5 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 PM_2.5-O₃ compound pollution.

Key words： PM_2.5-O₃ compound pollution meteorological factors thresholds weather situation

Received: 18 December 2018

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X513

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	Articles by authors
	MAO Zhuo-cheng
	XU Jian-ming
	YANG Dan-dan
	YU Zhong-qi
	QU Yuan-hao
	ZHOU Guang-qiang

Cite this article:

MAO Zhuo-cheng,XU Jian-ming,YANG Dan-dan等. Analysis of characteristics and meteorological causes of PM_2.5-O₃ compound pollution in Shanghai[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(7): 2730-2738.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I7/2730

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