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dc.contributor.authorCheng, Lin
dc.contributor.authorNormandeau, Claire
dc.contributor.authorBowden, Roxane
dc.contributor.authorDoucett, Richard
dc.contributor.authorGallagher, Barbora
dc.contributor.authorGillikin, David P
dc.contributor.authorKumamoto, Yuichiro
dc.contributor.authorMcKay, Jennifer L
dc.contributor.authorMiddlestead, Paul
dc.contributor.authorNinnemann, Ulysses S
dc.contributor.authorNothaft, Daniel
dc.contributor.authorDubinina, Elena O.
dc.contributor.authorQuay, Paul
dc.contributor.authorReverdin, Gilles
dc.contributor.authorShirai, Kotaro
dc.contributor.authorMørkved, Pål Tore
dc.contributor.authorTheiling, Bethany
dc.contributor.authorGeldern, Robert
dc.contributor.authorWallace, D. W. R.
dc.PublishedCheng L, Normandeau C, Bowden R, Doucett, Gallagher, Gillikin DP, Kumamoto Y, McKay, Middlestead, Ninnemann US, Nothaft, Dubinina EO, Quay P, Reverdin G, Shirai, Mørkved PT, Theiling, Geldern, Wallace DWR. An international intercomparison of stable carbon isotope composition measurements of dissolved inorganic carbon in seawater. Limnology and Oceanography : Methods. 2019;17(3):200-209eng
dc.description.abstractWe report results of an intercomparison of stable carbon isotope ratio measurements in seawater dissolved inorganic carbon (δ 13C‐DIC) which involved 16 participating laboratories from various parts of the world. The intercomparison involved distribution of samples of a Certified Reference Material for seawater DIC concentration and alkalinity and a preserved sample of deep seawater collected at 4000 m in the northeastern Atlantic Ocean. The between‐lab standard deviation of reported uncorrected values measured with diverse analytical, detection, and calibration methods was 0.11‰ (1σ ). The multi‐lab average δ 13C‐DIC value reported for the deep seawater sample was consistent within 0.1‰ with historical measured values for the same water mass. Application of a correction procedure based on a consensus value for the distributed reference material, improved the between‐lab standard deviation to 0.06‰. The magnitude of the corrections were similar to those used to correct independent data sets using crossover comparisons, where deep water analyses from different cruises are compared at nearby locations. Our results demonstrate that the accuracy/uncertainty target proposed by the Global Ocean Observing System (±0.05‰) is attainable, but only if an aqueous phase reference material for δ 13C‐DIC is made available and used by the measurement community. Our results imply that existing Certified Reference Materials used for seawater DIC and alkalinity quality control are suitable for this purpose, if a “Certified” or internally consistent “consensus” value for δ 13C‐DIC can be assigned to various batches.en_US
dc.rightsAttribution CC BYeng
dc.titleAn international intercomparison of stable carbon isotope composition measurements of dissolved inorganic carbon in seawateren_US
dc.typePeer reviewed
dc.typeJournal article
dc.rights.holderCopyright 2019 The Author(s)en_US
dc.source.journalLimnology and Oceanography : Methods

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