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Calibration source for OH radical based on synchronous photolysis

文献类型：期刊论文

作者Wang Feng-Yang3,4; Hu Ren-Zhi3; Xie Pin-Hua1,3,4,5; Wang Yi-Hui3,4; Chen Hao2; Zhang Guo-Xian3,4; Liu Wen-Qing1,3,4,5
刊名ACTA PHYSICA SINICA
出版日期2020-05-05
卷号69
关键词OH radical simultaneous photolysis ozone distribution coefficient
ISSN号1000-3290
DOI10.7498/aps.69.20200153
通讯作者Hu Ren-Zhi(rzhu@aiofm.ac.cn) ; Xie Pin-Hua(phxie@aiofm.ac.cn)
英文摘要OH radical is the most important oxidant in the atmosphere, and controls the tropospheric concentration of tropospheric trace gases such as CO, SO2, NO2, CH4 and other volatile organic compounds. Accurate measurement of the concentration of OH radical in troposphere is the key to clarifying the formation mechanism of secondary pollution in China. The laser-induced fluorescence (LIF) technique is widely used in tropospheric OH radical field observation due to its high sensitivity, high selectivity, and small interference. However, the LIF technique is not an absolute measurement technology. In recent years, OH radical measurements and simulations in many field observations show that the improvement of accuracy of calibration is a way to reduce the differences. Currently, the common calibration methods are ozone-alkene method and water photolysis method. Further improving the accuracy of calibration is a key factor to ensure the accurate measurement of OH radicals. In this paper, a portable calibration method of OH radicals based on simultaneous photolysis is introduced. The synthetic air with a certain water vapor concentration is irradiated in laminar flow by 185 nm light of mercury lamp, and the photolysis of water vapor and O-2 produce OH, HO2 radicals and O-3. The concentration of OH radicals is calculated by oxygen concentration, water vapor concentration, ozone concentration, oxygen absorption cross section and water vapor absorption cross section. The water vapor is measured by a high-precision temperature and humidity probe, and the systematic error of the probe is corrected by 911-0016 ammonia (NH3, H2O) analyzer. As the ozone concentration is only 0.5-1 ppb in the calibration, the commercial ozone analyzer cannot meet the requirement for the measurement. A high-precision ozone analyzer O-3-CRDS based on cavity-ring-down spectrocopy is built to achieve the detection limit of 15 ppt (1 sigma). Using the O-3-CRDS analyzer, the concentration distribution coefficient of ozone in laminar flow along the radial direction of the flow tube (P = 1.9) is measured. Because the absorption cross section of oxygen at 185 nm is seriously affected by oxygen column concentration and the characteristics of mercury lamp, the oxygen absorption cross section is remeasured based on Lambert's law, which is sigma o(2)= (1.25 +/- 0.08)x10(-20) cm(2). The portable calibration device is established by establishing the corresponding relationship between ozone concentration and light intensity. By changing the concentration of water vapor in the flow tube, the OH radicals with concentrations in a range of 3x10(8)- 2.8x10(9) cm(-3) are produced, which are used to calibrate the atmospheric OH radical measurement instrument based on LIF technique. The fluorescence signal has a good correlation with the concentration of OH. The calibration device of OH radical is used to calibrate the LIF system during "a comprehensive study of the ozone formation mechanism in Shenzhen" (STORM) field observation in Autumn 2018. The calibration results under the field condition show that the calibration uncertainty of the calibration device for LIF instrument is 13.0%, which has good stability and accuracy.
WOS关键词LASER-INDUCED FLUORESCENCE ; POPCORN FIELD CAMPAIGN ; TROPOSPHERIC OH ; INSTRUMENT ; ABSORPTION ; HO2 ; SPECTROSCOPY
资助项目National Key R&D Program of China[2017YFC0209401] ; National Natural Science Foundation of China[U19A2044] ; National Natural Science Foundation of China[91644107] ; National Natural Science Foundation of China[61575206] ; National Natural Science Foundation of China[61805257] ; President's Fund of Hefei Research Institute of Chinese Academy of Sciences, China[YZJJ2018QN6]
WOS研究方向Physics
语种英语
WOS记录号WOS:000535992600010
出版者CHINESE PHYSICAL SOC
资助机构National Key R&D Program of China ; National Natural Science Foundation of China ; President's Fund of Hefei Research Institute of Chinese Academy of Sciences, China
源URL[http://ir.hfcas.ac.cn:8080/handle/334002/103187]  
专题中国科学院合肥物质科学研究院
通讯作者Hu Ren-Zhi; Xie Pin-Hua
作者单位1.Chinese Acad Sci, CAS Ctr Excellence Reg Atmospher Environm, Inst Urban Environm, Xiamen 361000, Peoples R China
2.Suzhou Univ Sci & Technol, Coll Mech Engn, Suzhou 215009, Peoples R China
3.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Environm Opt & Technol, Hefei 230031, Peoples R China
4.Univ Sci & Technol China, Hefei 230026, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Wang Feng-Yang,Hu Ren-Zhi,Xie Pin-Hua,et al. Calibration source for OH radical based on synchronous photolysis[J]. ACTA PHYSICA SINICA,2020,69.
APA Wang Feng-Yang.,Hu Ren-Zhi.,Xie Pin-Hua.,Wang Yi-Hui.,Chen Hao.,...&Liu Wen-Qing.(2020).Calibration source for OH radical based on synchronous photolysis.ACTA PHYSICA SINICA,69.
MLA Wang Feng-Yang,et al."Calibration source for OH radical based on synchronous photolysis".ACTA PHYSICA SINICA 69(2020).

入库方式： OAI收割

来源：合肥物质科学研究院

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