swRho(salinity, temperature = NULL, pressure = NULL, longitude = 300, latitude = 30, eos = getOption("oceEOS", default = "gsw"))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.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.eos="gsw";
see ‘Details’).eos="gsw"; see
‘Details’)."unesco" [1,2] or "gsw"
[3,4].sw* functions took temperature to be in
IPTS-68 units. As GSW capabilities were added in early 2015, the assumed
unit of temperature was taken to be ITS-90. This change means that
old code has to be modified, by replacing e.g. swRho(S, T, p) with
swRho(S, T90fromT68(T), p). At typical oceanic values, the difference
between the two scales is a few millidegrees.eos="unesco", the density is calculated using the UNESCO equation
of state for seawater [1,2], and if eos="gsw", the GSW formulation
[3,4] is used.
2. Gill, A.E., 1982. Atmosphere-ocean Dynamics, Academic Press, New York, 662 pp.
3. IOC, SCOR, and IAPSO (2010). The international thermodynamic equation of seawater-2010: Calculation and use of thermodynamic properties. Technical Report 56, Intergovernmental Oceanographic Commission, Manuals and Guide.
4. McDougall, T.J. and P.M. Barker, 2011: Getting started with TEOS-10 and the Gibbs Seawater (GSW) Oceanographic Toolbox, 28pp., SCOR/IAPSO WG127, ISBN 978-0-646-55621-5.
swSigma0 (and
equivalents at other pressure horizons), swSigmaT, and
swSigmaTheta.Other functions that calculate seawater properties: T68fromT90,
T90fromT48, T90fromT68,
swAbsoluteSalinity,
swAlphaOverBeta, swAlpha,
swBeta, swCSTp,
swConservativeTemperature,
swDepth, swDynamicHeight,
swLapseRate, swN2,
swPressure, swRrho,
swSCTp, swSTrho,
swSigma0, swSigma1,
swSigma2, swSigma3,
swSigma4, swSigmaTheta,
swSigmaT, swSigma,
swSoundAbsorption,
swSoundSpeed, swSpecificHeat,
swSpice, swTFreeze,
swTSrho,
swThermalConductivity,
swTheta, swViscosity,
swZ
library(oce)
rho <- swRho(35, 13, 1000)
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