在这项研究中,我们于2018年5月1日至6月30日在郑州进行了观察实验,中国中部的一个主要城市,近年来,地面臭氧(O3)污染已变得严重。O3及其前体的浓度,以及从市区获得的H2O2和气象数据(延长,YC),郊区(郑州大学,ZZU)和背景网站(Ganglishuiku,GLSK)。结果表明,O3浓度超过中国国家II级空气质量标准(93.3ppbv)的比率为59.0%,52.5%,和55.7%在上述三个网站具有良好的一致性,分别,说明O3污染是郑州的一个区域性问题。O3日峰值出现在15:00-16:00,与VOCs相反,NOx,和CO,并与H2O2一致。对YC的气象因素和化学影响对O3形成的详尽统计分析。高浓度的前体,高温,相对湿度低,中高风速以及以南风和东南风为主的风向导致了郑州的O3事件。O3的形成分析表明,反应性烯烃如异戊二烯和顺式-2-丁烯对O3的形成贡献最大。使用VOC/NOx比率和烟雾产生模型来确定O3-VOC-NOx敏感性。初夏郑州O3的形成主要在VOC限制区和过渡区交替存在。这表明烯烃和NOx的同时减排对减少郑州市的O3污染是有效的。
In this study, we conducted an observation experiment from May 1 to June 30, 2018 in Zhengzhou, a major city in central China, where ground ozone (O3) pollution has become serious in recent years. The concentrations of O3 and its precursors, as well as H2O2 and meteorological data were obtained from the urban site (Yanchang, YC), suburban (Zhengzhou University, ZZU) and background sites (Ganglishuiku, GLSK). Result showed that the rates of O3 concentration exceeded Chinese National Air Quality Standard Grade II (93.3 ppbv) were 59.0%, 52.5%, and 55.7% at the above three sites with good consistency, respectively, indicating that O3 pollution is a regional problem in Zhengzhou. The daily peak O3 appeared at 15:00-16:00, which was opposite to VOCs, NOx, and CO and consistent with H2O2. The exhaustive statistical analysis of meteorological factors and chemical effects on O3 formation at YC was advanced. The high concentration of precursors, high temperature, low relative humidity, and moderately high wind speed together with the wind direction dominated by south and southeast wind contribute to urban O3 episodes in Zhengzhou. O3 formation analysis showed that reactive alkenes such as isoprene and cis-2-butene contributed most to O3 formation. The VOCs/NOx ratio and smog production model were used to determine O3-VOC-NOx sensitivity. The O3 formation in Zhengzhou during early summer was mainly under VOC-limited and transition regions alternately, which implies that the simultaneous emission reduction of alkenes and NOx is effective in reducing O3 pollution in Zhengzhou.