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

Umezawa, T., Brenninkmeijer, C. A. M., Rockmann, T., van der Veen, C., Tyler, S. C., Fujita, R., et al. (2018). Interlaboratory comparison of of δ13C and δD measurements of atmospheric CH4 for combined use of data sets from different laboratories. Atmospheric Measurement Techniques, 11(2), 1207-1231. doi:10.5194/amt-11-1207-2018.

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 Creators:
Umezawa, T.1, Author              
Brenninkmeijer, Carl A. M.1, Author              
Rockmann, Thomas2, Author
van der Veen, Carina2, Author
Tyler, Stanley C.2, Author
Fujita, Ryo2, Author
Morimoto, Shinji2, Author
Aoki, Shuji2, Author
Sowers, Todd2, Author
Schmitt, Jochen2, Author
Bock, Michael2, Author
Beck, Jonas2, Author
Fischer, Hubertus2, Author
Michel, Sylvia E.2, Author
Vaughn, Bruce H.2, Author
Miller, John B.2, Author
White, JamesW. C.2, Author
Brailsford, Gordon2, Author
Schaefer, Hinrich2, Author
Sperlich, Peter2, Author
Brand, Willi A.2, AuthorRothe, Michael2, AuthorBlunier, Thomas2, AuthorLowry, David2, AuthorFisher, Rebecca E.2, AuthorNisbet, Euan G.2, AuthorRice, Andrew L.2, AuthorBergamaschi, Peter2, AuthorVeidt, Cordelia2, AuthorLevin, Ingeborg2, Author more..
Affiliations:
1Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              
2external, ou_persistent22              

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 Abstract: 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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Language(s): eng - English
 Dates: 2018
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000426745200002
DOI: 10.5194/amt-11-1207-2018
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Title: Atmospheric Measurement Techniques
  Abbreviation : AMT
Source Genre: Journal
 Creator(s):
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Publ. Info: Göttingen : European Geosciences Union, Copernicus
Pages: - Volume / Issue: 11 (2) Sequence Number: - Start / End Page: 1207 - 1231 Identifier: ISSN: 1867-1381
CoNE: https://pure.mpg.de/cone/journals/resource/1867-1381