徐州市大气PM<sub>2.5</sub>与O<sub>3</sub>作用关系的季节变化

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Abstract

The correlation between major atmospheric pollutants PM_2.5 and O₃ under the effect of East Asian monsoons was analyzed by using the environmental monitoring observations from 2013 to 2017 in Xuzhou. Based on meteorological observations, this paper further investigated the seasonal variation of interaction mechanism between PM_2.5 and O₃. The results showed that:PM_2.5 and O₃ were positively related with the correlation coefficient of 0.56 in summer monsoon (SM), while PM_2.5 and O₃ were negatively related with the correlation coefficient of -0.30 in winter monsoon (WM), both passing the confidence test of 99%. This indicated that the interaction of air compound pollutants PM_2.5 and O₃ in Xuzhou presented opposite the seasonal changes. In SM featured by strong solar radiation, high air temperature and strong oxidation, O₃ dominated the atmospheric oxidation, and oxidation effectively promoted secondary particle formation. The promotion of O₃ on PM_2.5 dominated the changes of air compound pollution in SM. In WM, the air temperature was low and the atmospheric oxidation was weak, then the enhanced PM_2.5 levels could suppress atmospheric photochemistry by reducing solar radiation, with the ozone change rate decreasing and peaking time postponing. The inhibitory effect of PM_2.5 on O₃ dominated the changes of air compound pollution in WM in Xuzhou.

Key words： PM_2.5 O₃ air compound pollution atmospheric oxidation East Asian monsoons

Received: 21 November 2018

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X513

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	Articles by authors
	ZHANG Yu-jing
	ZHAO Tian-liang
	YING Chong-zhi
	WANG Zi-fa
	Ge Bao-zhu
	LIU Duan-yang
	Du Xin-xin

Cite this article:

ZHANG Yu-jing,ZHAO Tian-liang,YING Chong-zhi等. Seasonal variation of the relationship between surface PM_2.5 and O₃ concentrations in Xuzhou[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(6): 2267-2272.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I6/2267

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