Measurements of NO2 mixing ratios with topographic target light scattering-differential optical absorption spectroscopy system and comparisons to point monitoring technique |
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| Authors: | Wang Yang a Li Ang a Xie Pin-Hua a Zeng Yi a Wang Rui-Bin b Chen Hao a Pei Xian a Liu Jian-Guo a and Liu Wen-Qing |
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| Affiliation: | a) a) Key Laboratory of Environmental Optical & Technology,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230031,China b) China National Environmental Monitoring Center,Beijing 100029,China |
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| Abstract: | ![]()
A topographic target light scattering-differential optical absorption spectroscopy(ToTaL-DOAS) system is developed for measuring average concentrations along a known optical path and studying surface-near distributions of atmospheric trace gases.The telescope of the ToTaL-DOAS system points to targets which are located at known distances from the measurement device and illuminated by sunlight.Average concentrations with high spatial resolution can be retrieved by receiving sunlight reflected from the targets.A filed measurement of NO2 concentration is performed with the ToTaL-DOAS system in Shijiazhuang in the autumn of 2011.The measurement data are compared with concentrations measured by the point monitoring technique at the same site.The results show that the ToTaL-DOAS system is sensitive to the variation of NO2 concentrations along the optical path. |
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| Keywords: | atmospheric optics target light scattering-differential optical absorption spectroscopy（ToTaL-DOAS） atmospheric trace gas averaging mixing ratio |
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