Ocean Carbon and Biogeochemistry Data System

SOFeX 2002 Polar Star cruise
CTD conductivity sensor calibration notes

08 February 2007: Prepared for OCB data system by Cyndy Chandler, OCB DMO (WHOI).

Bottle salinity samples were run onboard the Polar Star using IAPSO standards to build a calibration curve. Standards and samples were run three times and an average of these values was used for the final sample value. Measured values were plotted against CTD values (excluding CTD2) with a regression equation applied to the data. This equation was then applied to all CTD salinity values.

y = 1.0111x - 0.3856
R2 = 0.9948


The summary calibration charts from the original Excel file are available in a PDF format file.

The original salinometer data were contributed as a MS Excel file: PS_sal_calibration_file.xls

Contacts: Steven Pike and Ken Buesseler (WHOI)