Preprints
https://doi.org/10.5194/amt-2021-45
https://doi.org/10.5194/amt-2021-45

  25 Feb 2021

25 Feb 2021

Review status: a revised version of this preprint was accepted for the journal AMT and is expected to appear here in due course.

Gas Reference Materials for Underpinning Atmospheric Measurements of Stable Isotopes of Nitrous Oxide

Ruth E. Hill-Pearce1, Aimee Hillier1, Eric Mussell Webber1, Kanokrat Charoenpornpukdee1,2, Simon O'Doherty2, Joachim Mohn3, Christoph Zellweger3, David R. Worton1, and Paul J. Brewer1 Ruth E. Hill-Pearce et al.
  • 1National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, United Kingdom
  • 2University of Bristol, Atmospheric Chemistry Research Group, Bristol, United Kingdom
  • 3Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Air Pollution/Environmental Technology, Dübendorf, Switzerland

Abstract. The precise measurement of the amount fraction of atmospheric nitrous oxide (N2O) is required to understand global emission trends. Analysis of the site-specific stable isotopic composition of N2O provides a means to differentiate emission sources. The availability of accurate reference materials of known N2O amount fractions and isotopic composition is critical for achieving these goals. We present the development of nitrous oxide gas reference materials for underpinning measurements of atmospheric composition and isotope ratio. Uncertainties target the World Metrological Organisation Global Atmosphere Watch (WMO-GAW) compatibility goal of 0.1 nmol mol−1 and extended compatibility goal of 0.3 nmol mol−1, for atmospheric N2O measurements in an amount fraction range of 325–335 nmol mol−1. We also demonstrate the stability of amount fraction and isotope ratio of these reference materials and present a characterisation study of the cavity ring down spectrometer used for analysis of the reference materials.

Ruth E. Hill-Pearce et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2021-45', Stefan Persijn, 17 Mar 2021
    • AC1: 'Reply on RC1', Aimee Hillier, 21 May 2021
  • RC2: 'Comment on amt-2021-45', Anonymous Referee #2, 19 Mar 2021
    • AC2: 'Reply on RC2', Aimee Hillier, 21 May 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2021-45', Stefan Persijn, 17 Mar 2021
    • AC1: 'Reply on RC1', Aimee Hillier, 21 May 2021
  • RC2: 'Comment on amt-2021-45', Anonymous Referee #2, 19 Mar 2021
    • AC2: 'Reply on RC2', Aimee Hillier, 21 May 2021

Ruth E. Hill-Pearce et al.

Ruth E. Hill-Pearce et al.

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Short summary
There is currently a need for gas reference materials with well characterized delta values for monitoring N2O amount fractions. We present work towards the preparation of gas reference materials for calibration of in-field monitoring equipment, which target the WMO-GAW data quality objectives for comparability of amount fraction and demonstrate the stability of δ15Nα, δ15Nβ and δ18O values with pressure and effects of cylinder passivation.