This is analogous to swSigma0()
, but referenced to 1000db pressure.
swSigma1(
salinity,
temperature = NULL,
pressure = NULL,
longitude = NULL,
latitude = NULL,
eos = getOption("oceEOS", default = "gsw")
)
Potential density anomaly (kg/m\(^3\)).
either practical salinity (in which case temperature
and pressure
must be provided) or an oce
object, in
which case salinity
, temperature
(in the ITS-90 scale; see
next item), etc. are inferred from the object, ignoring the
other parameters, if they are supplied.
in-situ temperature (\(^\circ\)C), defined
on the ITS-90 scale. This scale is used by GSW-style calculation (as
requested by setting eos="gsw"
), and is the value contained within
ctd
objects (and probably most other objects created with data
acquired in the past decade or two). Since the UNESCO-style calculation is
based on IPTS-68, the temperature is converted within the present function,
using T68fromT90()
.
pressure (dbar)
longitude of observation (only used if eos="gsw"
;
see “Details”).
latitude of observation (only used if eos="gsw"
; see
“Details”).
equation of state, either "unesco"
(references 1 and 2)
or "gsw"
(references 3 and 4).
Dan Kelley
See citations provided in the swRho()
documentation.
Other functions that calculate seawater properties:
T68fromT90()
,
T90fromT48()
,
T90fromT68()
,
computableWaterProperties()
,
locationForGsw()
,
swAbsoluteSalinity()
,
swAlpha()
,
swAlphaOverBeta()
,
swBeta()
,
swCSTp()
,
swConservativeTemperature()
,
swDepth()
,
swDynamicHeight()
,
swLapseRate()
,
swN2()
,
swPressure()
,
swRho()
,
swRrho()
,
swSCTp()
,
swSR()
,
swSTrho()
,
swSigma()
,
swSigma0()
,
swSigma2()
,
swSigma3()
,
swSigma4()
,
swSigmaT()
,
swSigmaTheta()
,
swSoundAbsorption()
,
swSoundSpeed()
,
swSpecificHeat()
,
swSpice()
,
swSpiciness0()
,
swSpiciness1()
,
swSpiciness2()
,
swSstar()
,
swTFreeze()
,
swTSrho()
,
swThermalConductivity()
,
swTheta()
,
swViscosity()
,
swZ()