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

Umezawa, Taku; Brenninkmeijer, Carl A. M.; Röckmann, Thomas; van der Veen, Carina; Tyler, Stanley C.; Fujita, Ryo; Morimoto, Shinji; Aoki, Shuji; Sowers, Todd; Schmitt, Jochen; Bock, Michael; Beck, Jonas; Fischer, Hubertus; Michel, Sylvia E.; Vaughn, Bruce H.; Miller, John B.; White, James W. C.; Brailsford, Gordon; Schaefer, Hinrich; Sperlich, Peter; Brand, Willi A.; Rothe, Michael; Blunier, Thomas; Lowry, David; Fisher, Rebecca E.; Nisbet, Euan G.; Rice, Andrew L.; Bergamaschi, Peter; Veidt, Cordelia; Levin, Ingeborg

doi:10.5194/amt-11-1207-2018

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

2018
By Umezawa, Taku ; Brenninkmeijer, Carl A. M. ; Röckmann, Thomas ; ...
Source: Atmos. Meas. Tech., 11, 1207–1231, 2018

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Journal Title:

Atmospheric Measurement Techniques
Personal Author:

Umezawa, Taku ; Brenninkmeijer, Carl A. M. ; Röckmann, Thomas ; van der Veen, Carina ; Tyler, Stanley C. ; ... More +

Umezawa, Taku ; Brenninkmeijer, Carl A. M. ; Röckmann, Thomas ; van der Veen, Carina ; Tyler, Stanley C. ; Fujita, Ryo ; Morimoto, Shinji ; Aoki, Shuji ; Sowers, Todd ; Schmitt, Jochen ; Bock, Michael ; Beck, Jonas ; Fischer, Hubertus ; Michel, Sylvia E. ; Vaughn, Bruce H. ; Miller, John B. ; White, James W. C. ; Brailsford, Gordon ; Schaefer, Hinrich ; Sperlich, Peter ; Brand, Willi A. ; Rothe, Michael ; Blunier, Thomas ; Lowry, David ; Fisher, Rebecca E. ; Nisbet, Euan G. ; Rice, Andrew L. ; Bergamaschi, Peter ; Veidt, Cordelia ; Levin, Ingeborg Less -
NOAA Program & Office:

CIRES (Cooperative Institute for Research in Environmental Sciences)
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We report results from a worldwide interlaboratory comparison of samples among laboratories that measure (or measured) stable carbon and hydrogen isotope ratios of atmospheric CH4 (δ13C-CH4 and δD-CH4). The offsets among the laboratories are larger than the measurement reproducibility of individual laboratories. To disentangle plausible measurement offsets, we evaluated and critically assessed a large number of intercomparison results, some of which have been documented previously in the literature. The results indicate significant offsets of δ13C-CH4 and δD-CH4 measurements among data sets reported from different laboratories; the differences among laboratories at modern atmospheric CH4 level spread over ranges of 0.5 ‰ for δ13C-CH4 and 13 ‰ for δD-CH4. The intercomparison results summarized in this study may be of help in future attempts to harmonize δ13C-CH4 and δD-CH4 data sets from different laboratories in order to jointly incorporate them into modelling studies. However, establishing a merged data set, which includes δ13C-CH4 and δD-CH4 data from multiple laboratories with desirable compatibility, is still challenging due to differences among laboratories in instrument settings, correction methods, traceability to reference materials and long-term data management. Further efforts are needed to identify causes of the interlaboratory measurement offsets and to decrease those to move towards the best use of available δ13C-CH4 and δD-CH4 data sets.
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Atmospheric Chemistry Data Sets
Source:

Atmos. Meas. Tech., 11, 1207–1231, 2018
DOI:

https://doi.org/10.5194/amt-11-1207-2018
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Journal Article
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CC BY
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urn:sha256:a754d82cd6abbe5b8d3d044b5885d7cb110681767b0604546b034cd74c9f7052
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https://repository.library.noaa.gov/view/noaa/27030/noaa_27030_DS1.pdf
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Interlaboratory comparison of δ13C and δD measurements of atmospheric CH4 for combined use of data sets from different laboratories

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