Seasonal variation of the relationship between surface PM2.5 and O3 concentrations in Xuzhou
ZHANG Yu-jing1,2, ZHAO Tian-liang1, YING Chong-zhi1, WANG Zi-fa2, Ge Bao-zhu2, LIU Duan-yang3, Du Xin-xin1
1. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing 210044, China;
2. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;
3. Jiangsu Provincial Observatory, Nanjing 210008, China
The correlation between major atmospheric pollutants PM2.5 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 PM2.5 and O3. The results showed that:PM2.5 and O3 were positively related with the correlation coefficient of 0.56 in summer monsoon (SM), while PM2.5 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 PM2.5 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 PM2.5 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 PM2.5 levels could suppress atmospheric photochemistry by reducing solar radiation, with the ozone change rate decreasing and peaking time postponing. The inhibitory effect of PM2.5 on O3 dominated the changes of air compound pollution in WM in Xuzhou.
张宇静, 赵天良, 殷翀之, 王自发, 葛宝珠, 刘端阳, 杜欣欣. 徐州市大气PM2.5与O3作用关系的季节变化[J]. 中国环境科学, 2019, 39(6): 2267-2272.
ZHANG Yu-jing, ZHAO Tian-liang, YING Chong-zhi, WANG Zi-fa, Ge Bao-zhu, LIU Duan-yang, Du Xin-xin. Seasonal variation of the relationship between surface PM2.5 and O3 concentrations in Xuzhou. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(6): 2267-2272.
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