ec2pss: Convert conductivity to salinity

In wql: Exploring Water Quality Monitoring Data

Convert conductivity to salinity

Description

Electrical conductivity data are converted to salinity using the Practical Salinity Scale and an extension for salinities below 2.

Usage

ec2pss(ec, t, p = 0)

Arguments

ec	conductivity, mS/cm
t	temperature, Celsius
p	gauge pressure, decibar

Details

ec2pss converts electrical conductivity data to salinity using the Practical Salinity Scale 1978 in the range of 2-42 (Fofonoff and Millard 1983). Salinities below 2 are calculated using the extension of the Practical Salinity Scale (Hill et al. 1986).

R2pss is the same function, except that conductivity ratios rather than conductivities are used as input.

Value

ec2pss and R2pss both return salinity values on the Practical Salinity Scale.

Note

Input pressures are not absolute pressures but rather gauge pressures. Gauge pressures are measured relative to 1 standard atmosphere, so the gauge pressure at the surface is 0.

Author(s)

Alan Jassby, James Cloern

References

Fofonoff N.P. and Millard Jr R.C. (1983) Algorithms for Computation of Fundamental Properties of Seawater. UNESCO Technical Papers in Marine Science 44. UNESCO, Paris, 53 p.

Hill K.D., Dauphinee T.M. and Woods D.J. (1986) The extension of the Practical Salinity Scale 1978 to low salinities. IEEE Journal of Oceanic Engineering 11, 109-112.

Examples

# Check values from Fofonoff and Millard (1983):
R = c(1, 1.2, 0.65) 
t = c(15, 20, 5)
p = c(0, 2000, 1500)
R2pss(R, t, p)  # 35.000 37.246 27.995
# Repeat calculation with equivalent conductivity values by setting 
# ec <- R * C(35, 15, 0):
ec = c(1, 1.2, 0.65) * 42.9140
ec2pss(ec, t, p)  # same results

wql documentation built on May 29, 2024, 6:32 a.m.