基于多波段LED长光程DOAS技术的合肥郊区HONO和NO2观测研究

doi:10.3969/j.issn.1673-6141.2025.06.003

摘要/Abstract

摘要： 利用基于多波段LED耦合光源搭建的长光程差分光学吸收光谱 (LP-DOAS) 系统，在2022 年3―5 月对合肥郊区春季NO2 和HONO 的质量浓度进行了高时间分辨率连续监测。研究发现NO2 的月均质量浓度表现为3 月 (19.00 μg/m3) > 4 月 (16.03 μg/m3) > 5 月 (14.66 μg/m3)； HONO 的月均质量浓度表现为5 月 (1.42 μg/m3) > 4 月 (1.31 μg/m3) > 3 月 (1.25 μg/m3)，同时多波段LED LP-DOAS监测的NO2质量浓度与国控站点监测的NO2质量浓度相关系数R 达0.895。鉴于NO2 主要来自交通排放，其最低质量浓度出现在14：00；白天HONO 的高质量浓度出现在 08：00、12：00―13：00 和16：00―18：00，分别对应NO2的3 个较高质量浓度时段，表明NO2在湿表面的非均相反应可能是HONO的重要来源。此外，研究还发现NO2和HONO在周末11：00―15：00 期间的质量浓度高于其在工作日相应时段的质量浓度。进一步分析表明， PM2.5和大气相对湿度会影响NO2非均相反应生成HONO的速率；观测期间PM2.5质量浓度和大气相对湿度越大，则NO2和HONO的拟合斜率越大，表明HONO的生成速率越大。

关键词: 多波段LED, 长光程差分吸收光谱, NO2, HONO, 非均相反应

Abstract: A long-path differential optical absorption spectroscopy (LP-DOAS) system based on a multiwavelength 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.

Key words: multi-wavelength LED, long-path differential optical absorption spectroscopy, NO2, HONO; heterogeneous reaction

中图分类号:

X831
X511

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.

GAO Qi , XING Chengzhi , LIN Hua , MA Wanchao , LIU Wenqing . Observation of HONO and NO2 in suburban area of Hefei based on multi-wavelength LED coupled long-path DOAS technology[J]. Journal of Atmospheric and Environmental Optics, 2025, 20(6): 713-725.

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