大气与环境光学学报2025，Vol.20Issue(6)：713-725,13.DOI:10.3969/j.issn.1673-6141.2025.06.003
基于多波段LED长光程DOAS技术的合肥郊区HONO和NO2观测研究
Observation of HONO and NO2 in suburban area of Hefei based on multi-wavelength LED coupled long-path DOAS technology
摘要
Abstract
A long-path differential optical absorption spectroscopy(LP-DOAS)system based on a multi-wavelength LED coupled light source was used to continuously monitor the mass concentrations of NO2 and HONO in the suburbs of Hefei,China,from March to May 2022.We found that the monthly averaged NO2 showed the order of March(19.00 μg/m3)>April(16.03 μg/m3)>May(14.66 μg/m3),and the monthly averaged HONO showed the order of May(1.42 μg/m3)>April(1.31 μg/m3)>March(1.25 μg/m3).At the same time,the correlation coefficient R between NO2 mass concentrations monitored by multi-wavelength LED LP-DOAS and those monitored by CNEMC reached 0.895.Considering that NO2 mainly comes from traffic emissions,its mass concentration was found to be the lowest at 14:00.The high mass concentration of HONO during the daytime occurred at 08:00,12:00-13:00 and 16:00-18:00 during the daytime,corresponding to the three periods of higher NO2 mass concentration periods,respectively,indicating that the heterogeneous reaction of NO2 on the wet surface may be the important source of HONO.In addition,the study also found that the mass concentrations of NO2 and HONO during 11:00-15:00 on weekends were higher than those during the same time periods on weekdays.Further analysis showed that PM2.5 mass concentration and relative humidity can affect the rate of heterogeneous reaction of NO2 to generate HONO,and the higher the PM2.5 mass concentration and relative humidity during the observation period,the greater the fitting slope between NO2 and HONO,indicating a higher generation rate of HONO.关键词
多波段LED/长光程差分吸收光谱/NO2/HONO/非均相反应Key words
multi-wavelength LED/long-path differential optical absorption spectroscopy/NO2/HONO/heterogeneous reaction分类
环境科学引用本文复制引用
高齐,邢成志,林华,麻万超,刘文清..基于多波段LED长光程DOAS技术的合肥郊区HONO和NO2观测研究[J].大气与环境光学学报,2025,20(6):713-725,13.基金项目
国家自然科学基金项目(42207113),安徽省自然科学基金项目(2108085QD180),中国科学院合肥物质科学研究院院长基金项目(YZJJ2021QN06) （42207113）
