Interlaboratory study for coral Sr/Ca and other element/Ca ratio measurements
Interlaboratory study for coral Sr/Ca and other element/Ca ratio measurements
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DOI：
10.1002/ggge.20230
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发表时间：
2013-09-01
影响因子：
3.5
通讯作者：
You, Chen-Feng
中科院分区：
文献类型：
--
作者：
Hathorne, Ed C.;Gagnon, Alex;You, Chen-Feng
利用珊瑚文石的锶/钙比值来重建过去的海表面温度。21个实验室参加了珊瑚锶/钙测量的实验室间研究。结果表明，实验室间的偏差可能很大，在极端情况下，可能会导致海温估计值在7摄氏度的范围内。然而，大多数数据属于较窄的范围，Porites珊瑚参考物质JCP-1现在得到了足够好的表征，根据国际地质分析师协会的指导方针，其认证的锶/钙值为8.838 mmoL/m ol，扩展不确定度为0.089 mmoL/m ol。在95%的置信度水平下，这种不确定性相当于使用Porites进行的SST估计的1.5摄氏度，因此接近目标适合度。实验室内可比误差中位数为
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