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| Study on Vertical Distribution of Atmospheric HONO in Winter Based on Multi-Axis Differential Absorption Spectroscopy |
| TIAN Xin1, 3, REN Bo3, 5, XIE Pin-hua1, 3, 4, 5, MOU Fu-sheng2*, XU Jin3, LI Ang3, LI Su-wen2, ZHENG Jiang-yi3LI Xiao-mei3, REN Hong-mei3, HUANG Xiao-hui1, PAN Yi-feng1, TIAN Wei1 |
1. Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China
2. Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation, Huaibei Normal University, Huaibei 235000, China
3. Key Laboratory of Environmental Optical and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
4. CAS Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
5. School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, China
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Abstract Nitrite (HONO), as one of the sources of OH free radical in the atmosphere, plays an important role in the oxidative capacity of the atmosphere. Moreover, previous studies have shown that HONO plays an important role in generating atmospheric haze in winter. The conversion of NO2 is considered one of the important sources of HONO. Therefore, researching the vertical distribution characteristics of HONO in the atmosphere has an important role in studying the formation and control of atmospheric pollution. Because of the important role of HONO in the atmosphere, currently, the methods of chemiluminescence and spectroscopy, as well as indirect methods, are mainly used to measure HONO in the atmosphere. MAX-DOAS method is a passive remote sensing technology that can quickly and effectively obtain the three-dimensional distribution of pollutants in the atmosphere. In this paper, the MAX-DOAS instrument was used for stereo detection of HONO and NO2 in the winter atmosphere of the Science Island of Hefei in December 2017. The vertical distribution characteristics of those are obtained through the PriAM algorithm. The research results show that during the observation period, the NO2 vertical mixed concentration (VMR) and vertical column concentration (VCD) in the range of 10m near the ground were in the range of 0.51×1011～20.5×1011 molecules·cm-3 and 6.0×1015～5.5×1016 molecules·cm-2, respectively.The concentration was mainly concentrated within 1 km, and evenly mixed near the ground. However, the VMR and VCD of HONO were between 0.03×1010～5.1×1010 molecules·cm-3 and 3.5×1014～7.0×1015 molecules·cm-2, respectively. The upper level of concentration was within 100m, and its concentration decreased significantly with the increase in height. The HONO/NO2 ratio was between 0.17%～16.0% (VMR) and 1.0%～25.0% (VCD), indicating that HONO was mainly derived from NO2 conversion during the study period. Under a typical polluted episode (2017.12.26—2017.12.31), HONO/NO2 was greater than 5%, and the concentration of HONO increased (greater than 0.26×1011 molecules·cm-3), indicating that the conversion of NO2 to HONO became strong. By combining the wind field changes to study the source of NO2 during the pollution period, it was found that the transmission in the urban area of Hefei, northern and northwestern Anhui has a significant effect on NO2 and HONO.
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Received: 2021-05-25
Accepted: 2021-10-11
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Corresponding Authors:
MOU Fu-sheng
E-mail: moufusheng@163.com
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