sw.sigma.theta {oce} | R Documentation |
Compute sigma-theta, the potential density of seawater, minus 1000 kg/m^3.
sigma.theta <- sw.sigma.theta(ctd) sigma.theta <- sw.sigma.theta(S, t=NULL, p=NULL)
ctd |
an object of class "ctd ". |
S |
salinity [PSU] |
t |
in-situ temperature [degC] |
p |
pressure [dbar] |
In the first form, the argument is a ctd
object, from
which the salinity, temperature and pressure values are extracted and
used to for the calculation.
Definition: sigma_theta=rho(S,theta(S,t,p),0) - 1000 kg/m^3.
Potential density anomaly [kg/m^3].
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
Gill, A.E., 1982. Atmosphere-ocean Dynamics, Academic Press, New York, 662 pp.
Related density routines include: link{sw.rho}
,
link{sw.sigma}
, and
link{sw.sigma.t}
.
sigma.theta <- sw.sigma.theta(35, 13, 1000) #