Articles | Volume 18, issue 22
https://doi.org/10.5194/amt-18-6591-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-18-6591-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
17 Nov 2025
Research article |
| 17 Nov 2025
| 17 Nov 2025
Harmonisation of methane isotope ratio measurements from different laboratories using atmospheric samples
Bibhasvata Dasgupta
CORRESPONDING AUTHOR
Institute for Marine and Atmospheric research Utrecht (UU), Utrecht University, the Netherlands
Malika Menoud
Institute for Marine and Atmospheric research Utrecht (UU), Utrecht University, the Netherlands
Carina van der Veen
Institute for Marine and Atmospheric research Utrecht (UU), Utrecht University, the Netherlands
Ingeborg Levin
Institut für Umweltphysik, Heidelberg University, INF 229, 69120 Heidelberg, Germany
deceased
Cordelia Veidt
Institut für Umweltphysik, Heidelberg University, INF 229, 69120 Heidelberg, Germany
Heiko Moossen
Max-Planck-Institute for Biogeochemistry (BGC-IsoLab), Jena, Germany
Sylvia Englund Michel
Institute of Arctic and Alpine Research (INSTAAR), University of Colorado, Boulder, USA
Peter Sperlich
National Institute of Water and Atmospheric Research (NIWA), Wellington, New Zealand
Shinji Morimoto
Center for Atmospheric and Oceanic Studies, Graduate School of Science, Tohoku University, Sendai, Japan
Ryo Fujita
Center for Atmospheric and Oceanic Studies, Graduate School of Science, Tohoku University, Sendai, Japan
Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan
Taku Umezawa
Center for Atmospheric and Oceanic Studies, Graduate School of Science, Tohoku University, Sendai, Japan
National Institute for Environmental Studies, Tsukuba, Japan
Stephen Platt
NILU, P.O. Box 100, 2027 Kjeller, Norway
Christine Groot Zwaaftink
NILU, P.O. Box 100, 2027 Kjeller, Norway
Cathrine Lund Myhre
NILU, P.O. Box 100, 2027 Kjeller, Norway
Rebecca Fisher
Centre of Climate, Ocean and Atmosphere, Department of Earth Sciences, Royal Holloway, University of London, Egham, UK
David Lowry
Centre of Climate, Ocean and Atmosphere, Department of Earth Sciences, Royal Holloway, University of London, Egham, UK
Euan G. Nisbet
Centre of Climate, Ocean and Atmosphere, Department of Earth Sciences, Royal Holloway, University of London, Egham, UK
James France
Centre of Climate, Ocean and Atmosphere, Department of Earth Sciences, Royal Holloway, University of London, Egham, UK
Ceres Woolley Maisch
Institute for Marine and Atmospheric research Utrecht (UU), Utrecht University, the Netherlands
Centre of Climate, Ocean and Atmosphere, Department of Earth Sciences, Royal Holloway, University of London, Egham, UK
Gordon Brailsford
National Institute of Water and Atmospheric Research (NIWA), Wellington, New Zealand
Rowena Moss
National Institute of Water and Atmospheric Research (NIWA), Wellington, New Zealand
Daisuke Goto
National Institute of Polar Research, Tokyo, Japan
Sudhanshu Pandey
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
Sander Houweling
Department of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
Nicola Warwick
Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK
Thomas Röckmann
Institute for Marine and Atmospheric research Utrecht (UU), Utrecht University, the Netherlands
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Short summary
We combined long-term methane mole fraction and isotope measurements from eight laboratories that sample high-latitude stations to compare, offset correct and harmonise the datasets into a hemisphere merged timeseries. Because each laboratory uses slightly different methods, we adjusted the data to make it directly comparable. This allowed us to create a consistent record of atmospheric methane concentration and its isotopes from 1988 to 2023.
We combined long-term methane mole fraction and isotope measurements from eight laboratories...
