上海城区冬季大气HONO污染特征及源汇研究  

Characteristics and budget of nitrous acid at an urban site in winter of Shanghai,China

作　　者：周敏[1,2] 周扬 吴宇航 乔利平 朱书慧[1,2] ZHOU Min;ZHOU Yang;WU Yu-hang;QIAO Li-ping;ZHU Shu-hui(Shanghai Academy of Environmental Sciences,Shanghai 200233,China;State Environmental Protection Key Laboratory of the Cause and Prevention of Urban Air Pollution Complex,Shanghai 200233,China)

机构地区：[1]上海市环境科学研究院,上海200233 [2]生态环境部城市大气复合污染成因与防治重点实验室,上海200233

出　　处：《中国环境科学》2024年第12期6600-6607,共8页China Environmental Science

基　　金：国家重点研发计划资助项目(2022YFE0137100)。

摘　　要：2022年11月6日~2023年1月2日在上海市城区对大气中HONO及相关污染物进行了在线连续观测,并结合箱模式模拟获得了上海城区冬季HONO的浓度水平、变化特征及来源贡献.研究结果显示,上海冬季大气中HONO的平均浓度为(1.17±0.82)×10^(-9),浓度范围为(0.078~5.32)×10^(-9),污染天HONO浓度显著高于清洁天,约增加67.2%.HONO的日变化规律与NO_(x)较一致,呈现夜间高、昼间低的变化趋势.基于HONO_(corr)与不同影响因素的相关性分析,发现NO_(2)的非均相反应可能是夜间HONO的主要来源,而均相与非均相反应(包括光增加反应)均是昼间HONO的主要来源.箱模式模拟显示,HONO昼间来源以NO_(2)在地表面的光增强反应和NO与OH均相反应为主,污染天HONO平均生成速率分别为0.21和0.22×10^(-9)/h,夜间则以NO_(2)的地表面反应和一次源排放为主.污染天由于颗粒物及其组分浓度的上升,导致NO_(2)在不同表面上的非均相光增强反应贡献增加.Continuous measurements of HONO and related pollutants were conducted in the urban area of Shanghai from November6,2022,to January 2,2023.By combining box model simulations,the concentrations,characteristics,and sources of winter HONO in Shanghai urban area were obtained.The results showed that the average concentration of HONO was (1.17±0.82)×10^(-9),with a concentration range of (0.078~5.32)×10^(-9).The average concentration of HONO in pollution days was significantly higher than that in clean days,showing an increase of approximately 67.2%.HONO exhibited diurnal variation,with higher concentrations at night and lower concentrations during the day,similar to the diurnal variation of NO_x.Analysis of correlations between HONO_(corr) and various influencing factors indicated that the heterogeneous conversion of NO_(2) was the main source of HONO during nighttime,while both homogeneous and heterogeneous reactions (including photo-enhanced conversion) were dominate sources during daytime.Box model simulations suggested that daytime sources of HONO primarily were photo-enhanced conversion of NO_(2) on ground surfaces and homogeneous reactions involving OH and NO_(2).The average HONO formation rates in pollution days were 0.21 and 0.16×10^(-9)/h,respectively.During nighttime,the dominate sources were NO_(2) conversion on ground surfaces and primary emissions.The increase in PM_(2.5) and its chemical species during nighttime lead to an increased contribution from NO_(2) photo-enhanced conversion on various surfaces.

关 键 词：气态亚硝酸 污染特征 源汇分析 

分 类 号：X511[环境科学与工程—环境工程]