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| Study on the Methods of Collecting Atmospheric Pollution Gases in
Huaibei Region by Mobile Mini-DOAS |
| ZHANG Qi-jin1, 2, GUO Ying-ying1, 2, LI Su-wen1, 2*, MOU Fu-sheng1, 2* |
1. School of Physics and Electronic Information, Huaibei Normal University, Huaibei 235000, China
2. Anhui Province Key Laboratory of Pollutant Sensitive Material and Environment Remediation, Huaibei 235000, China
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Abstract Urban air pollutants in China mainly include nitrogen oxides,ozone,sulfur dioxide and particulate matter. NO2 and SO2 are common trace gases in atmospheric pollutants, which directly or indirectly impact ground air radiation,global climate,air quality and human health.Huaibei region is the production base of basic energy and important raw material coal in China. Local atmospheric pollution has become more complex due to long-term coal production. It is one of the research hot pots to acquire atmospheric pollutant concentration quickly. Differential optical absorption spectrometer(DOAS) is an optical remote sensing spectral equipment,which has the advantages of stability, and high sensitivity and is not restricted by building platform. It can obtain the concentration information of a variety of polluting gases at the same time. Because of the complex environment pollution in Huaibei, this paper constructed a mobile mini differential optical absorption spectroscopy(DOAS) system based on the mobile platform, which includes a spectrum acquisition system, temperature control system and GPS positioning system. The GPS positioning system was used to record the longitude, latitude and speed during the movement. The spectrometer was placed in the constant temperature system to ensure the accuracy of the system measurement. During the experiment, the performance of the system is tested, and the navigation observation route is planned first. The mobile DOAS measurement results are compared with the MAX-DOAS to verify the accuracy of the system to realize the rapid, convenient and accurate monitoring of typical atmospheric pollutants in Huaibei. During the measurement period, QDOAS software was used for inversion processing of the originally measured spectra and the relatively clean is selected as the reference spectrum to obtain the spatial distribution of NO2 and SO2 column concentration in the Huaibei region. The range of NO2 concentration is 0.509×1016～15.4×1016 molecule·cm-2, and that of SO2 is 0.353×1016～9.07×1016 molecule·cm-2. The results of mobile Mini-DOAS measurements were compared with MAX-DOAS measurements and TROPOMI data, which showed good consistency (correlation coefficient R2>0.75). Field experiments show that the mobile Mini-DOAS system can accurately obtain the distribution of urban pollution gas column, providing an effective technical means for confirming the source area of urban atmospheric pollution and verifying satellite remote sensing data.
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Received: 2022-01-09
Accepted: 2022-06-07
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Corresponding Authors:
LI Su-wen, MOU Fu-sheng
E-mail: swli@chnu.edu.cn；moufusheng@163.com
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