Compute the seawater speed of sound.
swSoundSpeed( salinity, temperature = NULL, pressure = NULL, longitude = NULL, latitude = NULL, eos = getOption("oceEOS", default = "gsw") )
either practical salinity (in which case
pressure must be provided) or an
oce object, in
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,
longitude of observation (only used if
latitude of observation (only used if
equation of state, either
"unesco" (references 1 and 2)
"gsw" (references 3 and 4).
Sound speed (m/s).
Fofonoff, P. and R. C. Millard Jr, 1983. Algorithms for computation of fundamental properties of seawater. Unesco Technical Papers in Marine Science, 44, 53 pp. (See section 9.)
Other functions that calculate seawater properties:
swSoundSpeed(40, T90fromT68(40), 10000) # 1731.995 (p48 of Fofonoff + Millard 1983) #>  1731.995