An international intercalibration effort has been assigned a high priority during the initial phase of GEOTRACES to ensure that results from different cruises, and from different labs, can be compared in a meaningful way.
Recommended methods for sampling and analysing seawater, as agreed following intercalibration cruises and meetings in 2008-2010, are detailed in the "Methods Manual (CookBook)".
Details of GEOTRACES seawater standards, including availability of standards and consensus values for many measurements, can be found by clicking here.
A forum for intercalibration and measurements issues can be accessed here.
Documents relevant to intercalibration: