# convert_StoR: Salinity-Conductivity Conversion In marelac: Tools for Aquatic Sciences

 convert_StoR R Documentation

## Salinity-Conductivity Conversion

### Description

Estimates the conductivity ratio from salinity, temperature and pressure.

The equation is valid over ranges of temperature from -2 to 35 `^\circ`C, pressure of 0 - 1000 bar and salinity 2-42 in the world ocean.

### Usage

``````convert_StoR(S = 35, t = 25, p = max(0, P-1.013253), P = 1.013253)
``````

### Arguments

 `S ` (practical) Salinity, -, `t ` Temperature, `^\circ`C, `P ` True Pressure, bar, `p ` Gauge (or applied) pressure, the pressure referenced against the local atmospheric pressure, bar.

### Value

The conductivity ratio (-), this is the conductivity at (S, t, p), divided by the conductivity at S = 35, t = 15, p = 0.

### Note

Pressure here is true pressure, 1 bar (at sea surface), in contrast to hydrostatic pressure in dbar of original formula.

The conductivity ratio for Salinity = 40, t = 40, `p` = 1000 is 1.888091.

### Author(s)

Karline Soetaert <karline.soetaert@nioz.nl>

### References

Fofonoff NP and Millard RC Jr, 1983. Algorithms for computation of fundamental properties of seawater. UNESCO technical papers in marine science, 44, 53 pp.
http://unesdoc.unesco.org/images/0005/000598/059832EB.pdf

`convert_AStoPS`, `convert_PStoAS`, `convert_RtoS`, `convert_StoCl`, `convert_p`, `convert_T`,

### Examples

``````convert_StoR(S = 40, t = 40, p = 1000)

convert_StoR(S = 35, t = 15, p = 0)

# Check values:
convert_StoR(S = 25, t = 10, p = 0)    #  0.654990
convert_StoR(S = 25, t = 10, p = 100)  #  0.662975
convert_StoR(S = 25, t = 10, p = 1000) #  0.712912

convert_StoR(S = 35, t = 10, p = 100) #  0.897778
convert_StoR(S = 40, t = 10, p = 100) #  1.011334

``````

marelac documentation built on Sept. 25, 2023, 5:06 p.m.