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Effect of Water Vapor Absorption on Measurements of Atmospheric Nitrate Radical by LP-DOAS
Su-wen Li a*,Wen-qing Liu b,Pin-hua Xie b,Yi-jun Yang a,De-bao Chen a,Zheng Li a
Author NameAffiliationE-mail
Su-wen Li a* Department of Physics, Huaibei Coal Industry Teachers College, Huaibei 235000, China suwen_li@yahoo.cn 
Wen-qing Liu b Key Laboratory of Environmental Optical and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China  
Pin-hua Xie b Key Laboratory of Environmental Optical and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China  
Yi-jun Yang a Department of Physics, Huaibei Coal Industry Teachers College, Huaibei 235000, China  
De-bao Chen a Department of Physics, Huaibei Coal Industry Teachers College, Huaibei 235000, China  
Zheng Li a Department of Physics, Huaibei Coal Industry Teachers College, Huaibei 235000, China  
Abstract:
During the measurement of atmospheric nitrate radical by long-path differential optical absorption spectroscopy, water vapor strong absorption could affect the measurement of nitrate radical and detection limits of system. Under the tropospheric condition, the optical density of water vapor absorption is non-linearly dependent on column density. An effective method was developed to eliminate the effect of water vapor absorption. Reference spectra of water vapor based on the daytime atmospheric absorption spectra, when fitted together with change of cross section with water vapor column densities, gave a more accurate fitting of water vapor absorptions, thus its effect on the measurements of nitrate radical could be restricted to a minimum and detection limits of system reached 3.6 ppt. The modified method was applied during an intensive field campaign in the Pearl River Delta, China. The NO3 concentration in polluted air masses varied from 3.6 ppt to 82.5 ppt with an average level of 23.6±1.8 ppt.
Key words:  Nitrate radical,Water vapor absorption, Long-path differential optical absorption spectroscopy,Detection limit
FundProject:
Effect of Water Vapor Absorption on Measurements of Atmospheric Nitrate Radical by LP-DOAS
李素文 a*,刘文清 b,谢品华 b,杨一军 a,陈得宝 a,李峥 a
摘要:
利用长程差分吸收光谱技术进行大气NO3自由基测量时,水汽的强烈吸收叠加在测量光谱中,对NO3的精确反演和探测限带来较大的影响. 通过分析水汽吸收的非线性效应,建立了一种去除水汽影响的有效方法. 通过测量日间大气吸收谱,并考虑日间水汽与夜晚水汽变化量,一同参与数据拟合,结果表明该方法可以有效地去除水汽吸收的影响. 把该方法应用于在珠三角外场实验中,获得了好的效果,探测限达到3.6 ppt。
关键词:  NO3,水汽吸收,长程差分吸收光谱,探测限
DOI:10.1088/1674-0068/21/05/433-437
分类号: