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《Acta Optica Sinica》 2014-01
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Continuous Field Measurements of Stable Isotopes in Atmospheric Water Vapor by FTIR Spectrometry

Wang Wei;Liu Wenqing;Zhang Tianshu;Key Laboratory of Environmental Optics and Technology,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences;  
Fourier transform infrared(FTIR)spectrometry can be used to measure broadband infrared spectra,and it can analyze various gases in the air simultaneously.A new method of measuring stable isotopes in atmospheric water vapor by open-path FTIR spectrometry is described.An open-path FTIR system is utilized to continuously measure the stable isotopes of water vapor in ambient air in a field experiment,which is based on the analysis of collected mid-infrared spectrum.The deuterium isotope ratiosδDare also obtained.The measurement error of this system is about 0.25% and 1.60% for H2 16 O and HD16 O respectively,and the measurement precision is about 1.32‰forδD.A detailed analysis of five-day data is presented to explore the variation of H2 16 O,HD16 O andδD with time.Furthermore,Keeling plot method is employed to study the deuterium isotopic signature of evapotranspiration. The results of the field experiment show the ability of this proposed measuring method combined with the open-path FTIR system for long-term measurement of the stable isotopes in the air.
【Fund】: 国家自然科学基金(41205119);; 中国科学院知识创新工程重要方向项目(KJCX2-EW-N07)
【CateGory Index】: O433
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