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The present data set is a set of stable carbon isotope signatures of various methane sources in Asia (Japan, Thailand and Bangladesh). The stable carbon isotope signatures were estimated from a set of air samples collected in proximity to individual sources including landfills, wastewater treatment facilities, rice paddies and agricultural combustion. The data set also include ethane to methane enhancement ratios for fossil fuel and combustion sources.
For each air sample collected in a glass flask, methane and ethane concentrations were measured by a mid-infrared absorption spectrometer MIRA Pico analyzer on site. The air samples were analyzed for stable carbon isotope ratio of methane by a method described by Umezawa et al. (2020). Isotope signature and ethane to methane enhancement ratio for each source were calculated from a set of air samples under influence of a single source. The methodologies are detailed in Umezawa et al. (2026).
Description
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Creator
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Taku Umezawa*1*2 (
 orcid.org/0000-0003-1217-7439), Yukio Terao*1, Tomonori Ishigaki*3, Yoshitaka Ebie*3, Satoshi Kameyama*3, Akihiko Ito*4, Sutthasil Noppharit*5, Wangyao Komsilp*6, Payomthip Panida*3, Yoochatchaval Wilasinee*7, Kawser Ahmed Md.*8, Rani Seema*9, Shohei Nomura*3, Yang Zhenglun*1, Shinji Saito*10, Junya Hoshi*10*1 Earth System Division, National Institute for Environmental Studies (NIES) *2 Graduate School of Science, Tohoku University *3 National Institute for Environmental Studies (NIES) *4 The University of Tokyo *5 Mae Fah Luang University *6 The Joint Graduate School of Energy and Environment (JGSEE), King Mongkut’s University of Technology Thonburi *7 Department of Environmental Engineering, Faculty of Engineering, Kasetsart University *8 Department of Oceanography, Faculty of Earth and Environmental Sciences, University of Dhaka *9 Bangladesh Oceanographic Research Institute (BORI) *10 Tokyo Metropolitan Research Institute for Environmental Protection |
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Release date
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2026/03/17
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Temporal coverage
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2021 - 2025
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Data provider
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NIES
Email: cgerdb_admin(at)nies.go.jp |
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DOI
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File format
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CSV
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Data volume
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10.1 KB
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Version
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ver. 1.0 (Last updated: 2026/03/17)
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Language
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English
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Data Set
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Parameters
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d13C-CH4, Country, State_region, Group_type, Group, Category, Sub_category, Longitude, Latitude, Sampling_date, Unc_d13C_CH4, C2C1_ratio, Unc_C2C1_ratio, N_AirSample, AirSample_ID, Comments
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Keywords
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[Free keywords]
Methane, Isotope, Ethane to methane ratio
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Update history
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[2026/03/17]
The data from 2021 to 2025 have been compiled. Ver.1.0.
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Contributors
Acknowledgements
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Acknowledgements
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The authors acknowledge the cooperation of the Bureau of Environment, Tokyo Metropolitan Government, for site access. We are also grateful to the relevant administrative offices for site access . We thank Youichi Noguchi for cooperation to sampling in rice paddy fields.
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Reference Information
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References
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Umezawa. T., Andrews. S. J., Saito, T. (2020), A Cryogen-Free Automated Measurement System of Stable Carbon Isotope Ratio of Atmospheric Methane, J. Meteorol. Soc. Jpn., 98(1), 115−127, doi:10.2151/jmsj.2020-007.
Umezawa, T., Terao, T., Ishigaki, T., Ebie, Y., Kameyama, S., Ito, A., Sutthasil, N., Wangyao, K., Payomthip, P., Yoochatchaval, W., Ahmed, M. K., Rani, S., Nomura, S., Yang, Z., Saito, S., Hoshi, J. (2026), Measurements of stable carbon isotope signatures of methane sources in Asian countries, in preparation.
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Terms and Conditions of Use*
*By accessing or using the Service you agree to be bound by these Terms. If you disagree with any part of the terms then you may not access the Service.
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License
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Citation format
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When this data set is referred to in publications, it should be cited in the following format.
Umezawa et al. (2026), Isotope signatures of methane sources in Asia, ver.x.x *1, NIES, DOI:10.17595/20260317.001. (Reference date*2: YYYY/MM/DD)
*1 The version number is indicated in the Description. *2 As the reference date, please indicate the date you downloaded the files. |