徐州市大气PM2.5与O3作用关系的季节变化  

Seasonal variation of the relationship between surface PM2.5 and O3 concentrations in Xuzhou

作　　者：张宇静[1,2] 赵天良 殷翀之[1] 王自发 葛宝珠[2] 刘端阳[3] 杜欣欣[1] ZHANG Yu-jing;ZHAO Tian-liang;YING Chong-zhi;WANG Zi-fa;Ge Bao-zhu;LIU Duan-yang;Du Xin-xin(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;State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences,Beijing 100029, China;Jiangsu Provincial Observatory, Nanjing 210008, China)

机构地区：[1]南京信息工程大学气象灾害预报预警与评估协同创新中心,中国气象局气溶胶-云-降水重点开放实验室,江苏南京210044 [2]中国科学院大气物理研究所,大气边界层物理和大气化学国家重点实验室,北京100029 [3]江苏省气象台,江苏南京210008

出　　处：《中国环境科学》2019年第6期2267-2272,共6页China Environmental Science

基　　金：国家重点研发计划试点专项(2016YFC0203304);国家自然科学基金资助项目(41830965,91744209);国家科技支撑计划项目(2014BAC22B04)

摘　　要：通过2013~2017年徐州市环境监测资料分析季风影响下主要大气复合污染物PM2.5和O3的相关性,并基于气象观测资料进一步探究PM2.5和O3相互作用机制的季节变化特征.结果表明:夏季风季节,PM2.5和O3呈正相关,相关系数高达0.56;冬季风季节,PM2.5和O3呈负相关,相关系数为-0.34,均通过了99%的置信检验,表明徐州市PM2.5和O3相互作用呈现相反的季节变化.夏季风季节,太阳辐射强,气温较高,大气氧化性较强,O3主导大气氧化性,大气氧化性通过促进二次颗粒物生成使得PM2.5浓度升高,夏季风季节以O3对PM2.5的促进作用主导城市大气复合污染变化;冬季风季节,太阳辐射弱,气温较低,大气氧化性较弱,高浓度的PM2.5削弱太阳辐射抑制大气光化学,导致O3生成率降低,冬季风季节以PM2.5对O3的抑制作用主导城市大气复合污染变化.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.

关 键 词：PM2.5 O3 大气复合污染 大气氧化性 东亚季风 

分 类 号：X513[环境科学与工程—环境工程]