Atmospheric Measurement Techniques
Atmospheric Measurement Techniques
AMT
Articles | Volume 19, issue 15
Articles | Volume 19, issue 15
https://doi.org/10.5194/amt-19-5267-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-19-5267-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 19, issue 15
Research article
 | 
12 Aug 2026
Research article |  | 12 Aug 2026

An absolute reference frame for nitrous oxide clumped and position-specific isotopes provided by thermal equilibration

Paul M. Magyar, Nico Kueter, Simone Brunamonti, Naizhong Zhang, Ivan Prokhorov, Noémy Chénier, Lukas Emmenegger, Béla Tuzson, and Joachim Mohn

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Short summary
Human activity drives increases in atmospheric nitrous oxide. Stable isotopes help trace the pathways involved. We developed a reliable way to calibrate measurements of rare isotopic variants of nitrous oxide so results from different labs can be compared. By heating nitrous oxide with a catalyst, the molecules reach well-defined equilibrium patterns suitable as a reference. To measure these isotopic variants quickly and precisely, we improved a laser-based measurement approach.
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