swSigmaTheta {oce}R Documentation

Seawater potential density anomaly

Description

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

Usage

swSigmaTheta(salinity, temperature=NULL, pressure=NULL, referencePressure=0,
    longitude=300, latitude=30, eos=getOption("oceEOS", default="gsw"))

Arguments

salinity

either practial salinity or an oce object; see “Details”.

temperature

in-situ temperature [degC], defined on the ITS-90 scale; see “Temperature units” in the documentation for swRho.

pressure

pressure [dbar].

referencePressure

reference pressure [dbar], e.g. 0 for sigma_0) calculation.

longitude

longitude of observation (only used if eos="gsw").

latitude

latitude of observation (only used if eos="gsw").

eos

name of equation of state to be used, either "unesco" or "gsw".

Details

If the first argument is an oce object, then salinity, etc., are extracted from it, and used for the calculation instead of any values provided in the other arguments.

Value

Potential density anomaly [kg/m^3], defined as sigma_theta=rho(S,theta(S,t,p),0) - 1000 kg/m^3.

Author(s)

Dan Kelley

References

See citations provided in the swRho documentation.

See Also

Related density routines include: swRho, swSigma, swSigmaTheta, swSigma0, etc.

Examples

swSigmaTheta(35, 13, 1000)             # 26.42514 (gsw)
swSigmaTheta(35, 13, 1000, eos="unesco") # 26.4219

[Package oce version 0.9-18 Index]