Study on HONO pollution characteristics and daytime unknown sources during summer and autumn in Guangzhou, China
YANG Wen-da1,2, CHENG Peng1,3, TIAN Zhi-lin1,2, ZHANG He-wei1,3, ZHANG Man-man1,3, WANG Bo-guang1,2
1. Institute of Mass Spectrometer and Atmospheric Environment, Jinan University, Guangzhou 510632, China;
2. Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China;
3. Guangdong Provincial Engineering Research Center for On-line Source Apportionment System of Air Pollution, Jinan University, Guangzhou 510632, China
Based on the mass concentrations and photolysis rate constant of HONO and O3 obtained at a super site in Jinan University, Guangzhou, in October, 2015 and July, 2016, this study analyzed the diurnal variation of HONO and its seasonal pollution characteristics; estimated the contributions of HONO and O3 to OH radicals; and investigated an unknown source of HONO during the daytime. The results showed that the average concentration of HONO was 3.15μg/m3 in the autumn, which was 1.6 times its concentration of 1.97μg/m3 in the summer. Both HONO and NO2 showed the typical diurnal variation pattern of low concentrations during the daytime and high concentrations during the nighttime. The contribution of HONO photolysis to OH radicals in the autumn and summer was much larger than that of O3, indicating that the photolysis of HONO in Guangzhou was probably the primary source of OH radicals. Budget analysis showed that there was an important unknown source of HONO during the daytime, and its daily contributions to HONO concentration in the autumn and summer accounted for 69% and 49% of the total source, respectively. Correlation analysis suggested that this unknown source of HONO was likely related to the light-enhanced reaction of NO2.
杨闻达, 程鹏, 田智林, 张贺伟, 张曼曼, 王伯光. 广州市夏秋季HONO污染特征及白天未知源分析[J]. 中国环境科学, 2017, 37(6): 2029-2039.
YANG Wen-da, CHENG Peng, TIAN Zhi-lin, ZHANG He-wei, ZHANG Man-man, WANG Bo-guang. Study on HONO pollution characteristics and daytime unknown sources during summer and autumn in Guangzhou, China. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(6): 2029-2039.
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