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    Interlaboratory study for coral Sr/Ca and other element/Ca ratio measurements

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    ggge20230.pdf (1.281Mb)
    Date
    2013-09-23
    Author
    Hathorne, Ed C.  Concept link
    Gagnon, Alexander C.  Concept link
    Felis, Thomas  Concept link
    Adkins, Jess F.  Concept link
    Asami, Ryuji  Concept link
    Boer, Wim  Concept link
    Caillon, Nicolas  Concept link
    Case, David H.  Concept link
    Cobb, Kim M.  Concept link
    Douville, Eric  Concept link
    deMenocal, Peter B.  Concept link
    Eisenhauer, Anton  Concept link
    Garbe-Schonberg, Dieter  Concept link
    Geibert, Walter  Concept link
    Goldstein, Steven L.  Concept link
    Hughen, Konrad A.  Concept link
    Inoue, Mayuri  Concept link
    Kawahata, Hodaka  Concept link
    Kolling, Martin  Concept link
    Cornec, Florence L.  Concept link
    Linsley, Braddock K.  Concept link
    McGregor, Helen V.  Concept link
    Montagna, Paolo  Concept link
    Nurhati, Intan S.  Concept link
    Quinn, Terrence M.  Concept link
    Raddatz, Jacek  Concept link
    Rebaubier, Helene  Concept link
    Robinson, Laura F.  Concept link
    Sadekov, Aleksey  Concept link
    Sherrell, Robert M.  Concept link
    Sinclair, Dan  Concept link
    Tudhope, Alexander W.  Concept link
    Wei, Gangjian  Concept link
    Wong, Henri  Concept link
    Wu, Henry C.  Concept link
    You, Chen-Feng  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6324
    As published
    https://doi.org/10.1002/ggge.20230
    DOI
    10.1002/ggge.20230
    Keyword
    Coral Sr/Ca ratios
    Abstract
    The Sr/Ca ratio of coral aragonite is used to reconstruct past sea surface temperature (SST). Twenty-one laboratories took part in an interlaboratory study of coral Sr/Ca measurements. Results show interlaboratory bias can be significant, and in the extreme case could result in a range in SST estimates of 7°C. However, most of the data fall within a narrower range and the Porites coral reference material JCp-1 is now characterized well enough to have a certified Sr/Ca value of 8.838 mmol/mol with an expanded uncertainty of 0.089 mmol/mol following International Association of Geoanalysts (IAG) guidelines. This uncertainty, at the 95% confidence level, equates to 1.5°C for SST estimates using Porites, so is approaching fitness for purpose. The comparable median within laboratory error is <0.5°C. This difference in uncertainties illustrates the interlaboratory bias component that should be reduced through the use of reference materials like the JCp-1. There are many potential sources contributing to biases in comparative methods but traces of Sr in Ca standards and uncertainties in reference solution composition can account for half of the combined uncertainty. Consensus values that fulfil the requirements to be certified values were also obtained for Mg/Ca in JCp-1 and for Sr/Ca and Mg/Ca ratios in the JCt-1 giant clam reference material. Reference values with variable fitness for purpose have also been obtained for Li/Ca, B/Ca, Ba/Ca, and U/Ca in both reference materials. In future, studies reporting coral element/Ca data should also report the average value obtained for a reference material such as the JCp-1.
    Description
    Author Posting. © American Geophysical Union, 2013. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry, Geophysics, Geosystems 14 (2013): 3730–3750, doi:10.1002/ggge.20230.
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    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Geochemistry, Geophysics, Geosystems 14 (2013): 3730–3750
     

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