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|Title:||Interlaboratory comparison of δ13C and δD measurements of atmospheric CH4 for combined use of data sets from different laboratories|
|Authors:||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|
|Citation:||ATMOSPHERIC MEASUREMENT TECHNIQUES vol. 11 p. 1207–1231|
|Publisher:||COPERNICUS GESELLSCHAFT MBH|
|Type:||Articles in periodicals and books|
|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 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.|
|JRC Directorate:||Energy, Transport and Climate|
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