Articles | Volume 14, issue 8
https://doi.org/10.5194/amt-14-5447-2021
https://doi.org/10.5194/amt-14-5447-2021
Research article
 | 
09 Aug 2021
Research article |  | 09 Aug 2021

Characterisation of gas reference materials for underpinning atmospheric measurements of stable isotopes of nitrous oxide

Ruth E. Hill-Pearce, Aimee Hillier, Eric Mussell Webber, Kanokrat Charoenpornpukdee, Simon O'Doherty, Joachim Mohn, Christoph Zellweger, David R. Worton, and Paul J. Brewer

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Cited articles

BIPM, IEC, IFCC, ILAC, ISO, IUPAC, IUPAP, and OIML: Evaluation of measurement data – guide to the expression of uncertainty in measurement, International Bureau of Weights and Measures/Bureau International des Poids et Measures, Working group 1 of the Joint Committee for Guides in Metrology (JCGM 100: 2008, GUM 1995 with minor corrections), available at: http://www.bipm.org/utils/common/documents/jcgm/JCGM 100 2008 E.pdf (last access: 20 January 2021), 2008. 
Brewer, P. J., Brown, R. J., Mussell Webber, E. B., van Aswegen, S., Ward, M. K., Hill-Pearce, R. E., and Worton, D. R.: Breakthrough in Negating the Impact of Adsorption in Gas Reference Materials, Anal. Chem., 91, 5310–5315, https://doi.org/10.1021/acs.analchem.9b00175, 2019a. 
Brewer, P. J., Kim, J. S., Lee, S., Tarasova, O. A., Viallon, J., Flores, E., Wielgosz, R. I., Shimosaka, T., Assonov, S., and Allison, C. E.: Advances in reference materials and measurement techniques for greenhouse gas atmospheric observations, Metrologia, 56, 034006, https://doi.org/10.1088/1681-7575/ab1506, 2019b. 
Brown, A.: GravCalc2 (version 2.3.0) User Guide, National Physical Laboratory (NPL), Teddington, UK, 2009. 
Denk, T. R., Mohn, J., Decock, C., Lewicka-Szczebak, D., Harris, E., Butterbach-Bahl, K., Kiese, R., and Wolf, B.: The nitrogen cycle: A review of isotope effects and isotope modeling approaches, Soil Biol. Biochem., 105, 121–137, https://doi.org/10.1016/j.soilbio.2016.11.015, 2017. 
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There is currently a need for gas reference materials with well-characterised 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.