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Comparability of oceanic nutrient data: IOCCP-JAMSTEC 2015 Inter-laboratory Calibration Exercise of a Certified Reference Material in Seawater

AuthorsAoyama, Michio; Abad, Mara ; Berdalet, Elisa CSIC ORCID ; Zhang, Jia-Zhong
Issue Date18-Sep-2016
CitationCLIVAR Open Science Conference
AbstractThe objective of this inter-laboratory calibration exercise is to evaluate and improve comparability of global nutrients data in the world ocean. IOCCP and JAMSTEC co-organized an inter-laboratory calibration exercise of nutrients in seawater using four lots of recently certified RM produced by KANSO and three CRMs provided by the National Meterology Institute of Japan which are certified in March 2014. Results were turned from 59 laboratories in 28 ountries. Lorean Institute of Science and Technology, KIOST, also offered to provide their recently developed RMs to this I/C exercise. The ranked concentration plots for a particular nutrient would be proportional and roughly paprallel to each other for samples with different nutrient concentrations if each laboratory appropriately compensated for the non-linearity of the calibration curves. However, there are non-proportional resuls from some laboratories for all the determinants as well as observed in the previous I/C studies. These results indicate that non-linearity of the calibration curves for nutrient analysis is one of significant sources of less comparability of nutrients data. It is clear that present comparability among participants in 2015 I/C exercise is quite similar with previously obtained comparability in 2012 I/C and previous I/C studies. Consensus standard deviations are about double of reported precision of measurements of the laboratories. Therefore these I/C results show that use of CRM will be able to greatly improve comparability of nutrient data among the laboratories in the world
DescriptionAoyama, Michio et al.-- CLIVAR Open Science Conference, Charting the course for climate and ocean research, 18-25 September 2016, Qingdao, China.-- 1 page, 3 figures, tables
Appears in Collections:(ICM) Comunicaciones congresos

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