广州市夏秋季HONO污染特征及白天未知源分析

发布时间：2018-05-10 16:59

本文选题：OH自由基 + HONO　；参考：《中国环境科学》2017年06期

【摘要】：利用2015年10月和2016年7月在广州市暨南大学大气超级站开展的气态亚硝酸(HONO)和O_3的质量浓度及其光解速率常数等相关参数的观测数据,对比分析了广州地区秋夏季的HONO变化规律和污染特性,估算了HONO和O_3对OH自由基的贡献,并且对白天HONO未知来源进行了探讨.结果表明:广州地区秋季HONO的平均浓度为3.15μg/m~3,夏季HONO的平均浓度为1.97μg/m~3,秋季HONO的平均浓度是夏季的1.6倍;HONO和NO_2均呈现典型的白天低,夜晚高的日变化规律;HONO光解对OH自由基的贡献在秋夏季均远大于O_3对OH自由基的贡献,说明广州地区HONO光解可能是OH自由基最主要的来源;对HONO白天未知来源的收支分析表明,HONO在白天存在着重要的未知源P_(unknown),其对HONO浓度的白天贡献在秋季和夏季分别占到总来源的69%和49%,这一较强的未知来源经相关性分析,很可能与白天NO_2的光增强反应有关.
[Abstract]:Based on the observation data of mass concentration and photolysis rate constant of gaseous HNO3 and OSA3 conducted at the atmospheric superstation of Jinan University in Guangzhou in October 2015 and July 2016, The variation law of HONO and pollution characteristics in autumn and summer in Guangzhou area were compared and analyzed. The contribution of HONO and O _ 3 to OH free radical was estimated and the unknown sources of HONO in daytime were discussed. The results showed that the average concentration of HONO in autumn was 3.15 渭 g / m ~ (-1) and that of HONO in summer was 1.97 渭 g / m ~ (-3). The average concentration of HONO in autumn was 1.6 times of that in summer. The high diurnal variation of night and the contribution of HONOphotolysis to OH radical in autumn and summer are much larger than that of OSP _ 3 in autumn and summer, indicating that HONO photolysis may be the most important source of OH radical in Guangzhou area. The analysis of the budget of unknown sources of HONO during the day shows that there is an important unknown source in the daytime, and its contribution to the concentration of HONO in the daytime accounts for 69% and 49% of the total sources in autumn and summer, respectively. It is likely to be related to the light-enhanced reaction of NO_2 during the day.
【作者单位】：暨南大学质谱仪器与大气环境研究所;暨南大学环境与气候研究院;广东省大气污染在线源解析系统工程技术研究中心;
【基金】：国家自然基金青年基金资助项目(41405002) 科技部科技支撑项目(2014BAC21B01)
【分类号】：X51

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