swSoundSpeed {oce} | R Documentation |
Compute the seawater speed of sound.
swSoundSpeed(salinity, temperature=NULL, pressure=NULL, longitude=300, latitude=30, eos=getOption("oceEOS", default="gsw"))
salinity |
either salinity [PSU] (in which case
|
temperature |
in-situ temperature [degC], defined on
the ITS-90 scale; see “Temperature units” in the documentation for
|
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 a ctd
or section
object, then
values for salinity, etc., are extracted from it, and used for the
calculation, and the corresponding arguments to the present function are
ignored.
If eos="unesco"
, the sound speed is calculated using the formulation
in section 9 of Fofonoff and Millard (1983). If eos="gsw"
, then the
gsw_sound_speed
function from the gsw package
is used.
Sound speed [m/s].
Dan Kelley
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.)
swSoundSpeed(40, T90fromT68(40), 10000) # 1731.995 (p48 of Fofonoff + Millard 1983)