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 language | English |
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Pages (from-to) | 3730-3750 |
Number of pages | 21 |
Journal | Geochemistry, Geophysics, Geosystems |
Volume | 14 |
Issue number | 9 |
DOIs | |
Publication status | Published - 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