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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/amt-2020-345
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-345
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  05 Oct 2020

05 Oct 2020

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This preprint is currently under review for the journal AMT.

A dedicated robust instrument for water vapor generation at low humidity for use with a laser water isotope analyzer in cold and dry polar regions.

Christophe Leroy-Dos Santos1, Mathieu Casado1,2, Frédéric Prié1, Olivier Jossoud1, Erik Kerstel3, Samir Kassi3, Elise Fourré1, and Amaëlle Landais1 Christophe Leroy-Dos Santos et al.
  • 1Laboratoire des Sciences du Climat et de l’Environnement, CEA-CNRS-UVSQ-Paris Saclay-IPSL, Gif-sur-Yvette, France
  • 2Alfred Wegener Institut, Helmholtz Center for Polar and Marine Research, Potsdam, Germany
  • 3Laboratoire Interdisciplinaire de Physique, CNRS - Université Grenoble Alpes, Grenoble, France

Abstract. Obtaining precise continuous measurements of water vapor isotopic composition in dry places (polar or high-altitude regions) is an important challenge. The current limitation is the strong influence of humidity on the measured water isotopic composition by laser spectroscopy instruments for low humidity levels (below 3000 ppmv). This problem is addressed by determining the relationships between humidity and measured δ18O and δD of known water standards. We present here the development of a robust field instrument able to generate water vapor, down to 70 ppmv, at very stable humidity levels (average 1σ lower than 10 ppmv). This instrument, operated by a Raspberry interface, can be coupled to a commercial laser spectroscopy instrument: it turned to be very stable in an autonomous mode during more than one year at the East Antarctic Concordia station.

Christophe Leroy-Dos Santos et al.

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Christophe Leroy-Dos Santos et al.

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Latest update: 28 Oct 2020
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Short summary
We developped an instrument generating water vapor at low humidity with a very stable level. This instrument is primordial to calibrate water vapor isotopic records obtained in very dry places such as central Antarctica. We provide here the details of the instrument as well as results obtained for correcting water isotopic records over diurnal variability during a long field season in the Concordia station in East Antarctica.
We developped an instrument generating water vapor at low humidity with a very stable level....
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