Compute \(\alpha/\beta\) using McDougall's (1987) algorithm.
swAlphaOverBeta(salinity, temperature = NULL, pressure = NULL,
longitude = NULL, latitude = NULL, eos = getOption("oceEOS",
default = "gsw"))either practical salinity (in which case temperature
and pressure must be provided) or an oce object (in
which case salinity, etc. are inferred from the object).
in-situ temperature [\(^\circ\)C]
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" or "gsw".
Value in psu/\(^\circ\)C.
The eos="unesco" formulae are based on the UNESCO
equation of state, but are formulated empirically by Trevor J. McDougall,
1987, Neutral Surfaces, Journal of Physical Oceanography, volume 17, pages
1950-1964. The eos="gsw" formulae come from GSW; see references in
the swRho documentation.
Other functions that calculate seawater properties: T68fromT90,
T90fromT48, T90fromT68,
swAbsoluteSalinity, swAlpha,
swBeta, swCSTp,
swConservativeTemperature,
swDepth, swDynamicHeight,
swLapseRate, swN2,
swPressure, swRho,
swRrho, swSCTp,
swSTrho, swSigma0,
swSigma1, swSigma2,
swSigma3, swSigma4,
swSigmaTheta, swSigmaT,
swSigma, swSoundAbsorption,
swSoundSpeed, swSpecificHeat,
swSpice, swTFreeze,
swTSrho,
swThermalConductivity,
swTheta, swViscosity,
swZ
# NOT RUN {
swAlphaOverBeta(40, 10, 4000, eos="unesco") # 0.3476
# }
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