Acta Optica Sinica, Volume. 41, Issue 10, 1030002(2021)
Nitrogen Oxides Spatial Distribution and Emissions with Mobile Multi-Axis Differential Optical Absorption Spectroscopy in Wuhan City
For NOx pollutions in Wuhan during the outbreak of COVID-19, we applied a mobile MAX-DOAS and a portable ultraviolet DOAS to cooperatively measure NOx concentration in the third ring road of Wuhan from Feb. 29 th to Mar. 14 th, 2020. The mobile MAX-DOAS acquired the vertical column concentration (VCD) distribution of NO2 along its course and the portable ultraviolet DOAS measured the NO and NO2 concentrations to calculate [NOx]/[NO2]. Then, the NOx emission flux and its error of the third ring road of Wuhan were calculated in conjunction with the data of the wind field. The results show that the NOx emission flux during the measurements in the third ring of Wuhan ranges from 7.78 mol/s to 15.71 mol/s, about 10.78 mol/s on average. Compared with the average [NOx]/[NO2], the real-time [NOx]/[NO2] along the route of the mobile MAX-DOAS derived from the portable ultraviolet DOAS could effectively reduce the error of NOx emission flux caused by the [NOx]/[NO2] error. However, this method is not recommended in scenarios with substantial near-surface NOx emission sources.
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Yeyuan Huang, Ang Li, Min Qin, Zhaokun Hu, Pinhua Xie, Jin Xu, Jun Duan, Hongmei Ren, Xin Tian, Xiaomei Li, Bo Ren, Qiang Zhang, Hongyan Zhong. Nitrogen Oxides Spatial Distribution and Emissions with Mobile Multi-Axis Differential Optical Absorption Spectroscopy in Wuhan City[J]. Acta Optica Sinica, 2021, 41(10): 1030002
Category: Spectroscopy
Received: Nov. 20, 2020
Accepted: Dec. 17, 2020
Published Online: May. 11, 2021
The Author Email: Li Ang (angli@aiofm.ac.cn)