Water isotope ratio (δ2H and δ18O) measurements in atmospheric moisture using an optical feedback cavity enhanced absorption laser spectrometer

Iannone, Rosario; Romanini, D.; Cattani, O.; Meijer, H. A. J.; Kerstel, Erik

doi:10.1029/2009jd012895

Cited by 41 publications

(29 citation statements)

References 40 publications

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“…Successful inter-comparison of OF-CEAS analyzers and mass spectrometer [48] as well as gas chromatograph have been reported [49]. A real-time numerical fit of the measured absorption spectra enables the selective determination of the concentrations of all compounds that possess absorption lines in the selected spectral window.…”

Section: Optical Feedback Cavity-enhanced Absorption Spectroscopymentioning

confidence: 99%

Laser spectroscopy for breath analysis: towards clinical implementation

et al. 2018

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Detection and analysis of volatile compounds in exhaled breath represents an attractive tool for monitoring the metabolic status of a patient and disease diagnosis, since it is non-invasive and fast. Numerous studies have already demonstrated the benefit of breath analysis in clinical settings/applications and encouraged multidisciplinary research to reveal new insights regarding the origins, pathways, and pathophysiological roles of breath components. Many breath analysis methods are currently available to help explore these directions, ranging from mass spectrometry to laser-based spectroscopy and sensor arrays. This review presents an update of the current status of optical methods, using near and mid-infrared sources, for clinical breath gas analysis over the last decade and describes recent technological developments and their applications. The review includes: tunable diode laser absorption spectroscopy, cavity ring-down spectroscopy, integrated cavity output spectroscopy, cavity-enhanced absorption spectroscopy, photoacoustic spectroscopy, quartz-enhanced photoacoustic spectroscopy, and optical frequency comb spectroscopy. A SWOT analysis (strengths, weaknesses, opportunities, and threats) is presented that describes the laser-based techniques within the clinical framework of breath research and their appealing features for clinical use.

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Section: Optical Feedback Cavity-enhanced Absorption Spectroscopymentioning

confidence: 99%

Laser spectroscopy for breath analysis: towards clinical implementation

et al. 2018

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“…A mass balance of soil water compared to the total amount of vapor at saturation indicates that Rayleigh effects are far below the analytical precision of 0.15-0.25 ‰ for δ 18 O and of 1.0-1.5 ‰ for δ 2 H VSMOW, and do not affect the results significantly. Analysis was completed using Picarro cavity ring-down laser spectrometry (Picarro Inc., Santa Clara, California) (Iannone et al, 2010) for water isotopes based on principles of tunable diode laser spectrometry (Gianfrani et al, 2003;Kerstel and Gianfrani, 2008;Gupta et al, 2009). …”

Section: Analysis Of Soil Water Isotopic Compositionmentioning

confidence: 99%

Macropore flow of old water revisited: experimental insights from a tile-drained hillslope

Klaus

Zehe

Elsner

et al. 2013

Hydrol. Earth Syst. Sci.

135

133

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Abstract. The mechanisms allowing the rapid release of stored water to streams are poorly understood. Here we use a tile-drained field site to combine macroporous soils at the hillslope scale with the advantage of at least partly controlled lower boundary conditions. We performed a series of three irrigation experiments combining hydrometric measurements with stable isotope and bromide tracers to better understand macropore-matrix interactions and stored water release processes at the hillslope scale. Stable isotope concentrations were monitored in the irrigation water, the tile-drain discharge and the soil water before and after the experiment. Bromide was measured every 5-15 min in the tile-drain hydrograph. Different initial conditions for each experiment were used to examine how these influenced flow and transport. Different amounts of irrigation water were necessary to increase tile-drain discharge above the baseflow level. Hydrograph separation based on bromide data revealed that irrigation water contributions to peak tile-drain discharge were on the order of 20 %. Oxygen-18 and deuterium data were consistent with the bromide data and showed that pre-event soil water contributed significantly to the tile-drain event flow. However, the isotopic composition of soil water converged towards the isotopic composition of irrigation water through the course of the experiment. Mixing calculations revealed that by the end of the irrigation experiments 20 % of the soil water in the entire profile was irrigation water. The isotopic data showed that the pre-event water in the tile drain was mobilized in 20-40 cm soil depth where the macroporematrix interaction leads to an initiation of macropore flow after a moisture threshold is exceeded.

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“…Except for some work based on cold trap sampling (Jacob and Sonntag, 1991;Williams et al, 2004;Angert et al, 2008), there are to our knowledge only three high time-resolution studies published from European sites (Iannone et al, 2010;Kurita et al, 2012;Aemisegger et al, 2014) and none at all treating Mediterranean areas. In addition, there is a need for dual tracer databases, in order to use the deuterium excess signal (d = δD − 8 × δ 18 O; Dansgaard, 1964) as an additional indicator of atmospheric processes.…”

Section: Introductionmentioning

confidence: 99%

Deuterium excess in the atmospheric water vapour of a Mediterranean coastal wetland: regional vs. local signatures

2015

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Abstract. Stable isotopes of water vapour represent a powerful tool for tracing atmospheric vapour origin and mixing processes. Laser spectrometry recently allowed high timeresolution measurements, but despite an increasing number of experimental studies, there is still a need for a better understanding of the isotopic signal variability at different time scales. We present results of in situ measurements of δ 18 O and δD during 36 consecutive days in summer 2011 in atmospheric vapour of a Mediterranean coastal wetland exposed to high evaporation (Camargue, Rhône River delta, France). The mean composition of atmospheric vapour (δ v ) is δ 18 O = −14.66 ‰ and δD = −95.4 ‰, with data plotting clearly above the local meteoric water line on a δ 18 O-δD plot, and an average deuterium excess (d) of 21.9 ‰. Important diurnal d variations are observed, and an hourly time scale analysis is necessary to interpret the main processes involved in its variability. After having classified the data according to air mass back trajectories, we analyse the average daily cycles relating to the two main meteorological situations, i.e. air masses originating from North Atlantic Ocean and Mediterranean Sea. In both situations, we show that diurnal fluctuations are driven by (1) the influence of local evaporation, culminating during daytime, and leading to an increase in absolute water vapour concentration associated to a δ v enrichment and d increase; (2) vertical air mass redistribution when the Planetary Boundary Layer collapses in the evening, leading to a d decrease, and (3) dew formation during the night, producing a δ v depletion with d remaining stable. Using a twocomponent mixing model, we calculate the average composition of the locally evaporated vapour (δ E ). We find higher d (E) under North Atlantic air mass conditions, which is consistent with lower humidity conditions. We also suggest that δ v measured when the PBL collapses is the most representative of a regional signal. Strong, cold and dry winds coming from the north bring an isotopically depleted vapour, while light, warm and wet winds coming from the south bring an isotopically enriched vapour. Under northern conditions, a strong advection rate dilutes the contribution of the locally evaporated vapour (δ E ) to the ambient moisture (δ v ). The higher d values measured under northern conditions, compared to the Mediterranean situation, thus results from the combination of a higher d in both local and regional vapour. This depiction of typical daily cycles of water vapour isotopic composition can be used as a framework for further quantitative analyses of vapour sources during specific days.

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Water isotope ratio (δ²H and δ¹⁸O) measurements in atmospheric moisture using an optical feedback cavity enhanced absorption laser spectrometer

Cited by 41 publications

References 40 publications

Laser spectroscopy for breath analysis: towards clinical implementation

Laser spectroscopy for breath analysis: towards clinical implementation

Macropore flow of old water revisited: experimental insights from a tile-drained hillslope

Deuterium excess in the atmospheric water vapour of a Mediterranean coastal wetland: regional vs. local signatures

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