Articles | Volume 26, issue 1
https://doi.org/10.5194/acp-26-723-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-723-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Measurement report
| 
15 Jan 2026
Measurement report |
| 15 Jan 2026
| 15 Jan 2026
Measurement report: Isotopic composition of CH4 emitted from gas exploration sites in the Transylvanian Basin, Romania
Institute for Marine and Atmospheric Research Utrecht (IMAU), Utrecht University, Utrecht, the Netherlands
Malika Menoud
Institute for Marine and Atmospheric Research Utrecht (IMAU), Utrecht University, Utrecht, the Netherlands
now at: International Methane Emissions Observatory (IMEO), UNEP, Paris, France
Jacoline van Es
Institute for Marine and Atmospheric Research Utrecht (IMAU), Utrecht University, Utrecht, the Netherlands
Carina van der Veen
Institute for Marine and Atmospheric Research Utrecht (IMAU), Utrecht University, Utrecht, the Netherlands
Hossein Maazallahi
Institute for Marine and Atmospheric Research Utrecht (IMAU), Utrecht University, Utrecht, the Netherlands
now at: School of Energy and Sustainable Resources Engineering, College of Interdisciplinary Science and Technology, University of Tehran (UT), Tehran, Iran
Pawel Jagoda
Faculty of Physics and Applied Computer Science, AGH – University of Krakow, Krakow, Poland
Jaroslav M. Necki
Faculty of Physics and Applied Computer Science, AGH – University of Krakow, Krakow, Poland
Jakub Bartyzel
Faculty of Physics and Applied Computer Science, AGH – University of Krakow, Krakow, Poland
Piotr Korben
Faculty of Physics and Applied Computer Science, AGH – University of Krakow, Krakow, Poland
Institute of Environmental Physics, University of Heidelberg, Heidelberg, Germany
Sara Defratyka
Faculty of Physics and Applied Computer Science, AGH – University of Krakow, Krakow, Poland
now at: School of GeoSciences, University of Edinburgh, Edinburgh, UK
now at: National Physical Laboratory, Teddington, UK
Martina Schmidt
Institute of Environmental Physics, University of Heidelberg, Heidelberg, Germany
Marius Corbu
National Institute for Aerospace Research “Elie Carafoli” – INCAS, Bucharest, Romania
Faculty of Physics, University of Bucharest, Bucharest, Romania
Sebastian Iancu
National Institute for Aerospace Research “Elie Carafoli” – INCAS, Bucharest, Romania
Andreea Calcan
National Institute for Aerospace Research “Elie Carafoli” – INCAS, Bucharest, Romania
now at: International Methane Emissions Observatory (IMEO), UNEP, Paris, France
Magdalena Ardelean
National Institute for Aerospace Research “Elie Carafoli” – INCAS, Bucharest, Romania
Sorin Ghemulet
National Institute for Aerospace Research “Elie Carafoli” – INCAS, Bucharest, Romania
Cristian Pop
Faculty of Environmental Science and Engineering, Babes-Bolyai University, Cluj-Napoca, Romania
Andrei Radovici
Faculty of Environmental Science and Engineering, Babes-Bolyai University, Cluj-Napoca, Romania
Alexandru Mereuta
Faculty of Environmental Science and Engineering, Babes-Bolyai University, Cluj-Napoca, Romania
Horatiu Stefanie
Faculty of Environmental Science and Engineering, Babes-Bolyai University, Cluj-Napoca, Romania
Calin Baciu
Faculty of Environmental Science and Engineering, Babes-Bolyai University, Cluj-Napoca, Romania
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Latest update: 05 Mar 2026
Short summary
We report the isotopic composition of CH4 emitted from 48 installations in the gas production region of Transylvania, Romania which confirm the biogenic origin of the Transylvanian gas, produced by hydrogenotrophic CO2 reduction. This is similar to values reported previously from natural seeps and natural gas in a major city in the region. However, is more depleted in heavy isotopes than the oil-associated gas emitted in the Southern Romanian Plain, and gas leakages in the city of Bucharest.
We report the isotopic composition of CH4 emitted from 48 installations in the gas production...
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