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

Ed C. Hathorne*, Alex Gagnon, Thomas Felis, Jess Adkins, Ryuji Asami, Wim Boer, Nicolas Caillon, David Case, Kim M. Cobb, Eric Douville, Peter deMenocal, Anton Eisenhauer, Dieter Garbe-Schoenberg, Walter Geibert, Steven Goldstein, Konrad Hughen, Mayuri Inoue, Hodaka Kawahata, Martin Koelling, Florence L. CornecBraddock K. Linsley, Helen V. McGregor, Paolo Montagna, Intan S. Nurhati, Terrence M. Quinn, Jacek Raddatz, Helene Rebaubier, Laura Robinson, Aleksey Sadekov, Rob Sherrell, Dan Sinclair, Alexander W. Tudhope, Gangjian Wei, Henri Wong, Henry C. Wu, Chen-Feng You

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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 degrees 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 degrees C for SST estimates using Porites, so is approaching fitness for purpose. The comparable median within laboratory error is

Original languageEnglish
Pages (from-to)3730-3750
Number of pages21
JournalGeochemistry, Geophysics, Geosystems
Volume14
Issue number9
DOIs
Publication statusPublished - Sept 2013

Keywords / Materials (for Non-textual outputs)

  • coral Sr
  • Ca ratios
  • PLASMA-MASS SPECTROMETRY
  • ASSOCIATION-OF-GEOANALYSTS
  • SEA-SURFACE TEMPERATURE
  • GREAT-BARRIER-REEF
  • ABLATION ICP-MS
  • CALCIUM RATIOS
  • TRACE-ELEMENTS
  • CERTIFICATION
  • SAMPLES
  • RECORD

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