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 = NULL, latitude = NULL, eos = getOption("oceEOS", default = "gsw"))
salinity |
either practical salinity (in which case |
temperature |
in-situ temperature [degC], defined
on the ITS-90 scale. This scale is used by GSW-style calculation (as
requested by setting |
pressure |
pressure [dbar] |
longitude |
longitude of observation (only used if |
latitude |
latitude of observation (only used if |
eos |
equation of state, 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.
Other functions that calculate seawater properties: T68fromT90
,
T90fromT48
, T90fromT68
,
swAbsoluteSalinity
,
swAlphaOverBeta
, swAlpha
,
swBeta
, swCSTp
,
swConservativeTemperature
,
swDepth
, swDynamicHeight
,
swLapseRate
, swN2
,
swPressure
, swRho
,
swRrho
, swSCTp
,
swSTrho
, swSigma0
,
swSigma1
, swSigma2
,
swSigma3
, swSigma4
,
swSigmaTheta
, swSigma
,
swSoundAbsorption
,
swSoundSpeed
, swSpecificHeat
,
swSpice
, swTFreeze
,
swTSrho
,
swThermalConductivity
,
swTheta
, swViscosity
,
swZ
swSigmaT(35, 13, 1000, longitude=300, latitude=30, eos="gsw") # 26.39623 swSigmaT(35, T90fromT68(13), 1000, eos="unesco") # 26.39354