Computes theta, the potential temperature of seawater given
original temperature, salinity, pressure, and reference pressure
Usage
theta(S=35, T=25, P=0, Pref=0)
Arguments
S
Salinity on the practical salinity scale, default is 35
T
Temperature in degrees Celsius, default is 25oC
P
Hydrostatic pressure in bar (surface = 0; 1000 db = 100 bar), default is 0
Pref
Reference hydrostatic pressure in bar, default is 0
Value
thetapotential temperature of seawater (C)
encoding
latin1
Details
Computes the potential temperature of seawater relative to a
chosen reference pressure following Fofonoff and Millard (1983).
The potential temperature $\theta$ is the temperature that a
water parcel would have if were moved adiabatically to another pressure
level Pref. Typically, the potential temperature is referenced
to the surface ($Pref=0$). The potential teperature depends on
the original salinity S, in-situ temperature T
and pressure P.
This routine is essentially a wrapper for the swTheta
routine of the 'oce' package. Unlike the latter, pressure units here
are given in bars and method="unesco" is prescribed.
References
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.