Interlaboratory comparison of δ13C and δD measurements of atmospheric CH4 for combined use of data sets from different laboratories
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 δDCH4 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.
UMEZAWA Taku;
BRENNINKMEIJER C.A.M.;
RÖCKMANN Thomas;
VAN DER VEEN Carina;
TYLER Stanley;
FUJITA Ryo;
MORIMOTO Shinji;
AOKI Shuji;
SOWERS Todd;
SCHMITT Jochen;
BOCK Michael;
BECK Jonas;
FISCHER Hubertus;
MICHEL Sylvia E.;
VAUGHN Bruce H.;
MILLER J.;
WHITE J.W.C.;
BRAILSFORD Gordon;
SCHAEFER Hinrich;
SPERLICH Peter;
BRAND Willi A.;
ROTHE Michael;
BLUNIER Thomas;
LOWRY Dave;
FISHER Rebecca;
NISBET Euan;
RICE Andrew L.;
BERGAMASCHI Peter;
VEIDT Cordelia;
LEVIN Ingeborg;
2018-04-12
COPERNICUS GESELLSCHAFT MBH
JRC108977
1867-1381,
https://www.atmos-meas-tech.net/11/1207/2018/,
https://publications.jrc.ec.europa.eu/repository/handle/JRC108977,
10.5194/amt-11-1207-2018,
Additional supporting files
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