Continuous field measurements of [delta]D in water vapor by open-path Fourier transform infrared spectrometry

Wei Wang; Wenqing Liu; Tianshu Zhang

doi:10.1117/12.981998

5 December 2012 Continuous field measurements of δD in water vapor by open-path Fourier transform infrared spectrometry

Wei Wang, Wenqing Liu, Tianshu Zhang

Proceedings Volume 8562, Infrared, Millimeter-Wave, and Terahertz Technologies II; 85621B (2012) https://doi.org/10.1117/12.981998
Event: Photonics Asia, 2012, Beijing, China

Abstract

The stable isotopes in atmospheric water vapor contain rich information on the hydrologic cycles and gaseous exchange processes between biosphere and atmosphere. About one-week field experiment was conducted to continuously measure the isotope composition of water vapor in ambient air using an open-path FTIR system. Mixing ratios of H₂ ¹⁶O and HD¹⁶O were measured simultaneously. Analysis of water vapor isotopes revealed that the variations of H₂¹⁶O and HD¹⁶O were highly related. Mixing ratios of both isotopes varied considerably on a daily timescale or between days, with no obvious diurnal cycle, whereas the deuterium isotopic [delta]D showed clear diel cycle. The results illustrated that the correlation between [delta]D and H₂O mixing ratio was relatively weak, which was also demonstrated by the Keeling plot analysis with the whole data. Yet the further Keeling analysis on a daily timescale displayed more obvious linear relationship between [delta]D and the total H₂O concentration. All daily isotopic values of evapotranspiration source were obtained, with the range between -113.93±10.25‰ and -245.63±17.61‰ over the observation period.

Citation Download Citation

Wei Wang, Wenqing Liu, and Tianshu Zhang "Continuous field measurements of δD in water vapor by open-path Fourier transform infrared spectrometry", Proc. SPIE 8562, Infrared, Millimeter-Wave, and Terahertz Technologies II, 85621B (5 December 2012); https://doi.org/10.1117/12.981998

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