swSigmaT {oce} | R Documentation |
Compute sigma-t, a rough estimate of potential density of seawater, minus 1000 kg/m^3.
swSigmaT(salinity, temperature=NULL, pressure=NULL, longitude=300, latitude=30, eos=getOption("oceEOS", default="gsw"))
salinity |
either salinity [PSU] (in which case
|
temperature |
in-situ temperature [degC], defined on
the ITS-90 scale; see “Temperature units” in the documentation for
|
pressure |
pressure [dbar] |
longitude |
longitude of observation (only used if |
latitude |
latitude of observation (only used if |
eos |
name of equation of state to be used, either |
If the first argument is an oce
object, then salinity, etc.,
are extracted from it, and used for the calculation.
Quasi-potential density anomaly [kg/m^3], defined as the density calculated with pressure set to zero.
Dan Kelley
See citations provided in the swRho
documentation.
Related density routines include: swRho
,
swSigma
, swSigmaTheta
, swSigma0
,
etc.
swSigmaT(35, 13, 1000, eos="gsw") # 26.396816 swSigmaT(35, T90fromT68(13), 1000, eos="unesco") # 26.393538