广州市夏秋季HONO污染特征及白天未知源分析  

Study on HONO pollution characteristics and daytime unknown sources during summer and autumn in Guangzhou,China

作　　者：杨闻达[1,2] 程鹏[1,3] 田智林 张贺伟[1,3] 张曼曼[1,3] 王伯光[1,2] YANG Wen-da;CHENG Peng;TIAN Zhi-lin;ZHANG He-wei;ZHANG Man-man;WANG Bo-guang(Institute of Mass Spectrometer and Atmospheric Environment, Jinan University, Guangzhou 510632, China;Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China;Guangdong Provincial Engineering Research Center for On-line Source Apportionment System of Air Pollution, Jinan University, Guangzhou 510632, China)

机构地区：[1]暨南大学质谱仪器与大气环境研究所,广东广州510632 [2]暨南大学环境与气候研究院,广东广州511443 [3]广东省大气污染在线源解析系统工程技术研究中心,广东广州510632

出　　处：《中国环境科学》2017年第6期2029-2039,共11页China Environmental Science

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)

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.Based on the mass concentrations and photolysis rate constant of HONO and O3obtained at a super site inJinan University,Guangzhou,in October,2015and July,2016,this study analyzed the diurnal variation of HONO andits seasonal pollution characteristics;estimated the contributions of HONO and O3to OH radicals;and investigated anunknown source of HONO during the daytime.The results showed that the average concentration of HONO was3.15μg/m3in the autumn,which was1.6times its concentration of1.97μg/m3in the summer.Both HONO and NO2showed the typical diurnal variation pattern of low concentrations during the daytime and high concentrations duringthe nighttime.The contribution of HONO photolysis to OH radicals in the autumn and summer was much larger thanthat 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 dailycontributions to HONO concentration in the autumn and summer accounted for69%and49%of the total source,respectively.Correlation analysis suggested that this unknown source of HONO was likely related to thelight-enhanced reaction of NO2.

关 键 词：OH自由基 HONO O3 光解 未知来源 

分 类 号：X131.1[环境科学与工程—环境科学]