Title:
The European methane isotope database coupled with a global inventory of fossil and non-fossil δ13C- and δ2H-CH4 source signature measurements

Authors:
Malika Menoud, Carina van der Veen, Hossein Maazallahi, Thomas Röckmann, Institute for Marine and Atmospheric research Utrecht (IMAU), Utrecht University, Utrecht, the Netherlands
Julianne Fernandez, Semra Bakkaloglu, Dave Lowry, James France, Rebecca Fisher, Department of Earth Sciences, Royal Holloway, University of London, Egham TW20 0EX, United Kingdom
Piotr Korbeń, Martina Schmidt, Institute of Environmental Physics, Heidelberg University, Heidelberg, Germany
Mila Stanisavljević, Jaroslaw Necki, Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Krakow, Poland
Patryk Lakomiec, Janne Rinne, Department of Physical Geography and Ecosystem Science, Lund University, Sweden
Sara Defratyka, Camille Yver Kwok, Laboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL) CEA-CNRS-UVSQ Université Paris Saclay, Gif-sur-Yvette, 91191, France
Katarina Vinkovic, Truls Andersen, Huilin Chen, Centre for Isotope Research, Energy and Sustainability Institute Groningen (ESRIG), University of Groningen, Groningen, Netherlands

Abstract:
Emission sources of methane (CH4) can be distinguished with measurements of δ13C- and δ2H-CH4. We present new measurements of isotope signatures of various CH4 sources in Europe, mainly anthropogenic, sampled from 2017 to 2020. The present database also contains the most recent update of the global δ13C- and δ2H-CH4 signature dataset from the literature. We based this global update on the dataset by Sherwood et al. (2017), the δ13C-CH4 signature dataset by Sherwood et al. (2021), and additional data from peer-reviewed articles. The present database is presented in a manuscript currently in preparation for submission to Earth System Science Data. 

References: 
Sherwood, O.A., Schwietzke, S., Arling, V.A., Etiope, G., 2017. Global Inventory of Gas Geochemistry Data from Fossil Fuel, Microbial and Burning Sources, version 2017. Earth Syst. Sci. Data 9, 639–656. https://doi.org/10.5194/essd-9-639-2017
Sherwood, O.A., Schwietzke, S., Lan, X., 2021. Global δ13C-CH4 source signature inventory 2020. Available at: https://doi.org/10.15138/qn55-e011

Fair use statement:
This database is made freely available to the scientific community and is intended to stimulate and support global methane cycle and other modeling studies. Please refer to the database as follow:
Menoud, M., et. al. 2021. The European methane isotope database coupled with a global inventory of fossil and non-fossil δ13C- and δ2H-CH4 source signature measurements. Available at: .

Description:
“Europe data 2021” = the European methane isotope database, measurement results per location
“Europe data stat 2021” = the European methane isotope database statistics, i.e. values per locations averaged per region in countries
“Global fossil fuels” = gas composition database of fossil fuel CH4 sources, last updated by Sherwood et al. 2021, values averaged per ‘BASIN’
“Other literature” = δ13C- and δ2H-CH4 measurement data from non-fossil fuel and wetland sources δ13C-CH4 data in Sherwood et al. 2021, non-fossil fuel sources δ13C- and δ2H-CH4 data Sherwood et al. 2021, and from all sources δ13C- and δ2H-CH4 data found in other peer-reviewed articles.