南京市冬夏季HONO浓度水平及生成机制  

Atmospheric HONO Concentration Levels and Generation Mechanisms in Nanjing inWinter and Summer

作　　者：张奕 曹芳[1,2] 范美益 项妍琨 李翰宇 薛永文 章炎麟[1,2] ZHANG Yi;CAO Fang;FAN Mei-yi;XIANG Yan-kun;LI Han-yu;XUE Yong-wen;ZHANG Yan-lin(School of Ecology and Applied Meteorology,Nanjing University of Information Science and Technology,Nanjing 210044,China;Joint Laboratory for International Cooperation on Climate and Environmental Change,Ministry of Education,Atmospheric Environment Center,Nanjing University of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学生态与应用气象学院,南京210044 [2]南京信息工程大学大气环境中心,教育部气候与环境变化国际合作联合实验室,南京210044

出　　处：《环境科学》2024年第11期6286-6293,共8页Environmental Science

基　　金：国家杰出青年科学基金项目(42325304)。

摘　　要：HONO即气态亚硝酸,对空气质量和气候有很大影响.分别于2021年12月(冬季)和2022年7月(夏季)在南京市江北新区开展气态亚硝酸(HONO)观测研究.利用HONO浓度观测数据,结合采样期间大气NO_(x)、O_(3)浓度以及HONO生成过程的反应速率等参数,对比分析了南京地区冬夏季HONO的浓度变化规律,定量研究了昼夜HONO的来源和生成机制,并对白天HONO的未知来源进行了探讨.结果表明:南京地区冬季ρ(HONO)平均值为(2.2±1.1)μg·m^(-3),是夏季浓度平均值[(0.72±0.45)μg·m^(-3)]的3.0倍.冬夏季HONO浓度均呈现显著的昼低夜高的日变化规律.根据不同HONO生成途径的反应速率,计算得出NO_(2)的非均相反应是南京地区夜间HONO生成的主要途径;对HONO白天的收支分析表明,HONO在白天存在着重要的未知源(P_(unknown)),在冬季和夏季对日间HONO浓度的贡献率分别为69%和47%,相关性分析结果显示P_(unknown)与白天NO_(2)的光照催化反应有关.HONO,or gaseous nitrous acid,has a significant impact on air quality and climate.An atmospheric gaseous nitrous acid(HONO)observation study was carried out in December 2021(winter)and July 2022(summer)in the Jiangbei New District of Nanjing City,respectively.Using the HONO concentration observation data,combined with the atmospheric NOx and O_(3) concentrations during the sampling period as well as the reaction rate of the HONO generation process and other parameters,we compared and analyzed the change rule of the atmospheric HONO concentration during winter and summer in the Nanjing area,quantitatively investigated the sources of diurnal atmospheric HONO and its generation mechanism,and explored the unknown sources of atmospheric HONO during the daytime.The results showed that the mean value of atmosphericρ(HONO)in the Nanjing area during winter was(2.2±1.1)µg·m^(-3),which was 3.0 times the average concentration[(0.72±0.45)µg·m^(-3)]during summer.The atmospheric HONO concentrations during winter and summer showed a significant daily pattern of low during the daytime and high at nighttime.Based on the reaction rates of different HONO generation pathways,it was calculated that the non-homogeneous reaction of NO_(2) was the main pathway of atmospheric HONO generation at night in Nanjing.The analysis of the atmospheric HONO balance during the daytime showed that there existed an important unknown source of HONO during the daytime(P_(unknown)),and its contribution to the daytime atmospheric HONO concentration was 69%during winter and 47%during summer,respectively.The results of correlation analysis showed that P_(unknown) was related to the light-catalyzed reaction of NO_(2) during the daytime.

关 键 词：气态亚硝酸(HONO) 生成机制 反应速率 非均相反应 光照催化反应 

分 类 号：X131.1[环境科学与工程—环境科学]