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About Intercalibration


Intercalibration as a means of producing consistent and comparable global datasets has been a high priority in GEOTRACES from the beginning.

Protocols for sampling and analysis were developed early to ensure consistent data quality. The recommendations are summarized in the GEOTRACES cookbook, a valuable resource in many questions of sea water analysis.

The initially participating labs performed intercalibration exercises in order to ensure consistent analytical quality, published in L&O Methods. Newly joining labs can build on these efforts by intercalibrating with already intercalibrated labs. New exercises are being conducted as new parameters are added to GEOTRACES.

Elemental co-ordinators provide expertise on certain groups of analytes, often by providing reference (or consensus) materials, assisting with intercalibrating a lab, or as contact points for newly joining groups.

In addition to the general intercalibration of labs, all individual cruise data in GEOTRACES data products need to be intercalibrated with values from a crossover cruise following the intercalibration procedures, or following our defined alternative procedures. All TEI datasets going into a GEOTRACES data product from IDP2017 have been assessed by the Standards and Intercalibration Committee, based on the intercalibration report. The flow chart below illustrates how the S&I assess data quality for IDP. 

Many useful resources have been produced as part of GEOTRACES, available here. Also, please explore the resources available on the menu "S&I" in the main menu bar.

 2017 SI Flowchart
Figure: Data quality assessment for IDP2017 flow chart. Please click here to view it larger.
It is also possible to download it (as PDF file) here.

 Data Product (IDP2017)

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 Data Assembly Centre (GDAC)

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