Abstract:Concentration of ozone and its precursors from 12 automatic air monitoring stations in urban area of Beijing from December 2012 to November 2013 were analyzed to investigate their diurnal changes and correlation. The results showed that ozone concentration maintained relatively high from May to August while it was at a low level in other months. Ozone concentration exhibited a single peak distribution, with the peak appeared around 15:00 and 16:00, and in weekend the concentration was higher than weekdays. Ozone precursors, such as CO, NO, NO2 and NOx, showed bimodal distribution in most cases. Ozone and its precursors showed a negative correlation, and the correlation was weak in summer. According to the fitting equation of OX and NOx concentrations, atmospheric oxidants OX was mainly affected by regional O3 transmission during daytime in winter, and by local NOx pollution during nighttime in winter. The calculated photolysis rate of NO2 in an ideal situation showed that photolysis rate in spring, summer, autumn and winter was 0.180, 0.209, 0.169, 0.149min-1, respectively. The approximate photochemical equilibrium of O3, NO and NO2 was also observed in urban area with high O3 concentration during the day.
王占山, 李云婷, 陈添, 张大伟, 孙峰, 王欣, 郇宁, 潘丽波. 北京城区臭氧日变化特征及与前体物的相关性分析[J]. 中国环境科学, 2014, 34(12): 3001-3008.
WANG Zhan-Shan, LI Yun-Ting, CHEN Tian, ZHANG Da-Wei, SUN Feng, WANG Xin, HUAN Ning, PAN Li-Bo. Analysis on diurnal variation characteristics of ozone and correlations with its precursors in urban atmosphere of Beijing. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(12): 3001-3008.