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T (ºC), temperature: *
C (mmho/cm), conductivity: * P (db, 10 kPa), pressure: * |
S (C, T, P) = | |
This calculator derives salinity, S, from a value of the in situ conductivity C (as determined, for example, by a CTD), temperature T and pressure P.
The quantity used in the determination of salinity in bench salinometers is the conductivity ratio,
Rt(S,T) = C(S,T,0) / C(35,T,0)
where S is salinity, T is temperature and C is conductivity. To determine salinity from this salinity ratio, use the salinity from conductivity ratio calculator.
Note: 10 kPa = 1 dbar is close to the pressure increase that corresponds to a depth increase of 1 m. Entering a pressure value equal to the depth in metres will give an approximate result.
Temperature uses IPTS-68, salinity uses PSS-78; see reference.
Calculation based on Fofonoff, P. and R. C. Millard Jr (1983) Algorithms for computation of fundamental properties of seawater. Unesco Technical Papers in Marine Science 44, 53 pp.