Initial results of an intercomparison of AMS-based atmospheric 14CO2 measurements

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dc.contributor.authorMiller, Jen_AU
dc.contributor.authorLehman, SJen_AU
dc.contributor.authorWolak, Cen_AU
dc.contributor.authorTurnbull, Jen_AU
dc.contributor.authorDunn, Gen_AU
dc.contributor.authorGraven, Hen_AU
dc.contributor.authorKeeling, RFen_AU
dc.contributor.authorMeijer, HAJen_AU
dc.contributor.authorAerts-Bijma, ATen_AU
dc.contributor.authorPalstra, SWLen_AU
dc.contributor.authorSmith, AMen_AU
dc.contributor.authorAllison, CEen_AU
dc.contributor.authorSouthon, Jen_AU
dc.contributor.authorXu, XMen_AU
dc.contributor.authorNakazawa, Ten_AU
dc.contributor.authorAoki, Sen_AU
dc.contributor.authorNakamura, Ten_AU
dc.contributor.authorGuilderson, TPen_AU
dc.contributor.authorLaFranchi, Ben_AU
dc.contributor.authorMukai, Men_AU
dc.contributor.authorTerao, Yen_AU
dc.contributor.authorUchida, Men_AU
dc.contributor.authorKondo, Men_AU
dc.date.accessioned2025-04-08T04:34:55Zen_AU
dc.date.available2025-04-08T04:34:55Zen_AU
dc.date.issued2016-02-16en_AU
dc.date.statistics2025-03-14en_AU
dc.description.abstractThis article presents results from the first 3 rounds of an international intercomparison of measurements of Δ14CO2 in liter-scale samples of whole air by groups using accelerator mass spectrometry (AMS). The ultimate goal of the intercomparison is to allow the merging of Δ14CO2 data from different groups, with the confidence that differences in the data are geophysical gradients and not artifacts of calibration. Eight groups have participated in at least 1 round of the intercomparison, which has so far included 3 rounds of air distribution between 2007 and 2010. The comparison is intended to be ongoing, so that: a) the community obtains a regular assessment of differences between laboratories; and b) individual laboratories can begin to assess the long-term repeatability of their measurements of the same source air. Air used in the intercomparison was compressed into 2 high-pressure cylinders in 2005 and 2006 at Niwot Ridge, Colorado (USA), with one of the tanks "spiked" with fossil CO2, so that the 2 tanks span the range of Δ14CO2 typically encountered when measuring air from both remote background locations and polluted urban ones. Three groups show interlaboratory comparability within 1‰ for ambient level Δ14CO2. For high CO2/low Δ14CO2 air, 4 laboratories showed comparability within 2‰. This approaches the goals set out by the World Meteorological Organization (WMO) CO2 Measurements Experts Group in 2005. One important observation is that single-sample precisions typically reported by the AMS community cannot always explain the observed differences within and between laboratories. This emphasizes the need to use long-term repeatability as a metric for measurement precision, especially in the context of long-term atmospheric monitoring. © 2013 by the Arizona Board of Regents on behalf of the University of Arizona.en_AU
dc.identifier.citationMiller, J., Lehman, S., Wolak, C., Turnbull, J., Dunn, G., Graven, H., Keeling, R., Meijer, H. A. J., Aerts-Bijma, A. T., Palstra, S. W. L., Smith, A. M., Allison, C., Southon, J., Xu, X., Nakazawa, T., Aoki, S., Nakamura, T., Guilderson, T., LaFranchi, B., Mukai, H., Terao, Y., Uchida, M., & Kondo, M. (2013). Initial results of an intercomparison of AMS-based atmospheric 14CO2 measurements. Paper presented to the 21st International Radiocarbon Conference, 9-13 July, 2012, Paris, France. In Radiocarbon, 55(3), 1475-1483. doi:10.1017/S0033822200048402en_AU
dc.identifier.conferenceenddate2012-07-13en_AU
dc.identifier.conferencename21st International Radiocarbon Conferenceen_AU
dc.identifier.conferenceplaceParis, Franceen_AU
dc.identifier.conferencestartdate2012-07-09en_AU
dc.identifier.editorsA J T Jull & C Hattéen_AU
dc.identifier.issn0033-8222en_AU
dc.identifier.issue3–4en_AU
dc.identifier.journaltitleRadiocarbonen_AU
dc.identifier.pagination1475-1483en_AU
dc.identifier.urihttps://doi.org/10.2458/azu_js_rc.55.16382en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/16133en_AU
dc.identifier.volume55en_AU
dc.language.isoenen_AU
dc.publisherCambridge University Pressen_AU
dc.subjectMass spectrometersen_AU
dc.subjectAtmospheresen_AU
dc.subjectCarbon dioxideen_AU
dc.subjectAiren_AU
dc.subjectFossil fuelsen_AU
dc.subjectMeteorologyen_AU
dc.subjectCombustionen_AU
dc.subjectDataen_AU
dc.subjectConcentration ratioen_AU
dc.titleInitial results of an intercomparison of AMS-based atmospheric 14CO2 measurementsen_AU
dc.typeConference Paperen_AU
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