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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 11, issue 2
Atmos. Meas. Tech., 11, 1207–1231, 2018
https://doi.org/10.5194/amt-11-1207-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Atmos. Meas. Tech., 11, 1207–1231, 2018
https://doi.org/10.5194/amt-11-1207-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 02 Mar 2018

Research article | 02 Mar 2018

Interlaboratory comparison of δ13C and δD measurements of atmospheric CH4 for combined use of data sets from different laboratories

Taku Umezawa et al.
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Cited articles  
Allison, C. E., Francey, R. J., and Meijer H. A. J.: Recommendations for the reporting of stable isotope measurements of carbon and oxygen in CO2 gas, TECDOC-825 IAEA, Vienna, 155–162, 1995.
Aoki, S., Nakazawa, T., Murayama, S., and Kawaguchi, S.: Measurements of atmospheric methane at the Japanese Antarctic Station, Syowa, Tellus, 44B, 273–281, 1992.
Assonov, S. S. and Brenninkmeijer, C. A. M.: On the 17O correction for CO2 mass spectrometric isotopic analysis, Rapid Commun. Mass Sp., 17, 1007–1016, https://doi.org/10.1002/rcm.1012, 2003.
Behrens, M., Schmitt, J., Richter, K.-U., Bock, M., Richter, U., Levin, I., and Fischer, H.: A gas chromatography/combustion/isotope ratio mass spectrometry system for high-precision δ13C measurements of atmospheric methane extracted from ice core samples, Rapid Commun. Mass Sp., 22, 3261–3269, https://doi.org/10.1002/rcm.3720, 2008.
Bergamaschi, P., Schupp, M., and Harris, G. W.: High-precision direct measurements of 13CH4/12CH4 and 12CH3D/12CH4 ratios in atmospheric methane sources by means of a long-path tunable diode laser absorption spectrometer, Appl. Opt., 33, 7704–7716, 1994.
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Isotope measurements are useful for separating different methane sources. However, the lack of widely accepted standards and calibration methods for stable carbon and hydrogen isotopic ratios of methane in air has caused significant measurement offsets among laboratories. We conducted worldwide interlaboratory comparisons, surveyed the literature and assessed them systematically. This study may be of help in future attempts to harmonize data sets of isotopic composition of atmospheric methane.
Isotope measurements are useful for separating different methane sources. However, the lack of...
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