Determination of the 2H/1H, 17O/16O, and 18O/16O isotope ratios in water by means of tunable diode laser spectroscopy at 1.39 μm

Kerstel, Erik; Gagliardi, G.; Gianfrani, L.; Meijer, H. A. J.; Trigt, R. van; Ramaker, Ryne C.

doi:10.1016/s1386-1425(02)00053-7

Cited by 53 publications

(38 citation statements)

References 23 publications

(22 reference statements)

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“…This can be understood by considering the absorption spectrum. The absorption peak of δ 18 O is stronger than the one of δ 2 H (Kerstel et al, 2002;Gianfrani et al, 2003;Rothman et al, 2009 …”

Section: Dependency Of the Isotope Measurement Precision On Water Vapmentioning

confidence: 94%

Measuring variations of δ18O and δ2H in atmospheric water vapour using two commercial laser-based spectrometers: an instrument characterisation study

et al. 2012

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Abstract. Variations of stable water isotopes in water vapourhave become measurable at a measurement frequency of about 1 Hz in recent years using novel laser spectroscopic techniques. This enables us to perform continuous measurements for process-based investigations of the atmospheric water cycle at the time scales relevant for synoptic and mesoscale meteorology. An important prerequisite for the interpretation of data from automated field measurements lasting for several weeks or months is a detailed knowledge about instrument properties and the sources of measurement uncertainty. We present here a comprehensive characterisation and comparison study of two commercial laser spectroscopic systems based on cavity ring-down spectroscopy (Picarro) and off-axis integrated cavity output spectroscopy (Los Gatos Research). The uncertainty components of the measurements were first assessed in laboratory experiments, focussing on the effects of (i) water vapour mixing ratio, (ii) measurement stability, (iii) uncertainties due to calibration and (iv) response times of the isotope measurements due to adsorption-desorption processes on the tubing and measurement cavity walls. Based on the experience from our laboratory experiments, we set up a one-week field campaign for comparing measurements of the ambient isotope signals from the two laser spectroscopic systems. The optimal calibration strategy determined for both instruments was applied as well as the correction functions for water vapour mixing ratio effects. The root mean square difference between the isotope signals from the two instruments during the field deployment was 2.3 ‰ for δ 2 H, 0.5 ‰ for δ 18 O and 3.1 ‰ for deuterium excess. These uncertainty estimates from field measurements compare well to those found in the laboratory experiments. The present quality of measurements from laser spectroscopic instruments combined with a calibration system opens new possibilities for investigating the atmospheric water cycle and the land-atmosphere moisture fluxes.

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Section: Dependency Of the Isotope Measurement Precision On Water Vapmentioning

confidence: 94%

Measuring variations of δ18O and δ2H in atmospheric water vapour using two commercial laser-based spectrometers: an instrument characterisation study

et al. 2012

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“…Inspired by this early work, the group at the University of Groningen, using a color center laser at 2.7 µm [10] and later diode lasers near 1.4 µm [11], demonstrated that a sufficiently high level of precision, as well as accuracy, can be attained in the measurement of water isotope ratios to be able to apply the technique successfully to biomedical energy expenditure measurements [34][35][36], icecore palaeoclimate reconstruction [37], and plant leaf evaporation studies [38]. In fact, for the deuterium isotope ratio (δ 2 H), and at high isotopic enrichment levels also the oxygen isotope ratios (δ 17 O and δ 18 O), the level of precision is comparable to or exceeds that of IRMS.…”

Section: 2mentioning

confidence: 99%

“…The same data analysis procedure can also be used in experiments based on wavelength modulation spectroscopy (WMS) if one realizes that this procedure can be applied in the small absorption regime, assuring that the Fourier coefficients of the absorption profile are proportional to the species concentration associated with each spectral feature [11,46]. In WMS-based isotope ratio spectrometry, an alternative spectral analysis procedure can be used, also in the "large absorption" regime, exploiting the formalism of the Fourier expansion of the harmonic signals.…”

Section: Calibration Of Isotope Ratio Measurementsmentioning

confidence: 99%

Advances in laser-based isotope ratio measurements: selected applications

2008

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Advances in laser-based isotope ratio measurementsKerstel, E.; Gianfrani, L. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. ABSTRACT Small molecules exhibit characteristic ro-vibrational transitions in the near-and mid-infrared spectral regions, which are strongly influenced by isotopic substitution. This gift of nature has made it possible to use laser spectroscopy for the accurate analysis of the isotopic composition of gaseous samples. Nowadays, laser spectroscopy is clearly recognized as a valid alternative to isotope ratio mass spectrometry. Laserbased instruments are leaving the research laboratory stage and are being used by a growing number of isotope researchers for significant advances in their own field of research. In this review article, we discuss the current status and new frontiers of research on high-sensitivity and high-precision laser spectroscopy for isotope ratio analyses. Although many of our comments will be generally applicable to laser isotope ratio analyses in molecules of environmental importance, this paper concerns itself primarily with water and carbon dioxide, two molecules that were studied extensively in our respective laboratories. A complete coverage of the field is practically not feasible in the space constraints of this issue, and in any case doomed to fail, considering the large body of work that has appeared ever since the review by Kerstel in 2004 (Handbook of Stable Isotope Analytical Techniques, Chapt. 34, pp.

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“…Recently, laser spectroscopic techniques for water isotope measurements have been developed that achieve similar accuracies as the traditional IRMS methods and overcome some of its disadvantages (Kerstel et al, 1999(Kerstel et al, , 2002Gianfrani et al, 2003). Water vapor can be directly measured in real time without external sample preparation systems.…”

Section: Introductionmentioning

confidence: 99%

Water vapor δ2H and δ18O measurements using off-axis integrated cavity output spectroscopy

Sturm¹,

2010

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Abstract. We present a detailed assessment of a commercially available water vapor isotope analyzer (WVIA, Los Gatos Research, Inc.) for simultaneous in-situ measurements of δ 2 H and δ 18 O in water vapor. This method, based on offaxis integrated cavity output spectroscopy, is an alternative to the conventional water trap/isotope ratio mass spectrometry (IRMS) techniques. We evaluate the analyzer in terms of precision, memory effects, concentration dependence, temperature sensitivity and long-term stability. A calibration system based on a droplet generator is used to characterize the performance and to calibrate the analyzer. Our results show that the precision at an averaging time of 15 s is 0.16‰ for δ 2 H and 0.08‰ for δ 18 O. The isotope ratios are strongly dependent on the water mixing ratio of the air. Taking into account this concentration dependence as well as the temperature sensitivity of the instrument we obtained a long-term stability of the water isotope measurements of 0.38‰ for δ 2 H and 0.25‰ for δ 18 O. The accuracy of the WVIA was further assessed by comparative measurements using IRMS and a dew point generator indicating a linear response in isotopic composition and H 2 O concentrations. The WVIA combined with a calibration system provides accurate high resolution water vapor isotope measurements and opens new possibilities for hydrological and ecological applications.

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Determination of the 2H/1H, 17O/16O, and 18O/16O isotope ratios in water by means of tunable diode laser spectroscopy at 1.39 μm

Cited by 53 publications

References 23 publications

Measuring variations of δ<sup>18</sup>O and δ<sup>2</sup>H in atmospheric water vapour using two commercial laser-based spectrometers: an instrument characterisation study

Measuring variations of δ<sup>18</sup>O and δ<sup>2</sup>H in atmospheric water vapour using two commercial laser-based spectrometers: an instrument characterisation study

Advances in laser-based isotope ratio measurements: selected applications

Water vapor δ<sup>2</sup>H and δ<sup>18</sup>O measurements using off-axis integrated cavity output spectroscopy

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Determination of the 2H/1H, 17O/16O, and 18O/16O isotope ratios in water by means of tunable diode laser spectroscopy at 1.39 μm

Cited by 53 publications

References 23 publications

Measuring variations of δ&lt;sup&gt;18&lt;/sup&gt;O and δ&lt;sup&gt;2&lt;/sup&gt;H in atmospheric water vapour using two commercial laser-based spectrometers: an instrument characterisation study

Measuring variations of δ&lt;sup&gt;18&lt;/sup&gt;O and δ&lt;sup&gt;2&lt;/sup&gt;H in atmospheric water vapour using two commercial laser-based spectrometers: an instrument characterisation study

Advances in laser-based isotope ratio measurements: selected applications

Water vapor δ&lt;sup&gt;2&lt;/sup&gt;H and δ&lt;sup&gt;18&lt;/sup&gt;O measurements using off-axis integrated cavity output spectroscopy

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Measuring variations of δ<sup>18</sup>O and δ<sup>2</sup>H in atmospheric water vapour using two commercial laser-based spectrometers: an instrument characterisation study

Measuring variations of δ<sup>18</sup>O and δ<sup>2</sup>H in atmospheric water vapour using two commercial laser-based spectrometers: an instrument characterisation study

Water vapor δ<sup>2</sup>H and δ<sup>18</sup>O measurements using off-axis integrated cavity output spectroscopy