sw.sigma {oce}R Documentation

Seawater density anomaly

Description

Compute sigma, the in-situ density of seawater, minus 1000 kg/m^3.

Usage

sig <- sw.sigma(ctd)
sig <- sw.sigma(S, t=NULL, p=NULL);

Arguments

ctd an object of class "ctd".
S salinity [PSU]
t in-situ temperature [degC]
p pressure [dbar]

Details

In the first form, the argument is a ctd object, from which the salinity, temperature and pressure values are extracted and used to for the calculation.

Definition: rho(S,t,p) - 1000 kg/m^3.

Value

In-situ density anomaly [kg/m^3].

Author(s)

Dan Kelley

References

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

Gill, A.E., 1982. Atmosphere-ocean Dynamics, Academic Press, New York, 662 pp.

See Also

Related density routines include: sw.rho to calculate in-situ density, sw.sigma.t to calculate an archaic quantity found in old textbooks, and sw.sigma.theta to calculate potential density anomaly relative to the surface pressure. If you are thinking of using sw.sigma, you probably want sw.sigma.theta.

Examples

 sig <- sw.sigma(35, 13, 1000)  # 30.818

[Package oce version 0.1.71 Index]