gsw (version 1.0-5)

gsw_entropy_from_t: Specific Entropy i.t.o. Absolute Salinity, Temperature, and Pressure

Description

Calculates specific entropy in terms of Absolute Salinity, in-situ temperature and pressure.

Usage

gsw_entropy_from_t(SA, t, p)

Arguments

SA

Absolute Salinity [ g/kg ]

t

in-situ temperature (ITS-90) [ degC ]

p

sea pressure [dbar], i.e. absolute pressure [dbar] minus 10.1325 dbar

Value

specific entropy [ J/(kg*K) ]

Details

The present R function works with a wrapper to a C function contained within the GSW-C system (Version 3.05-4 dated 2017-08-07, available at https://github.com/TEOS-10/GSW-C, as git commit '5b4d959e54031f9e972f3e863f63e67fa4f5bfec'), which stems from the GSW-Fortran system (https://github.com/TEOS-10/GSW-Fortran) which in turn stems from the GSW-Matlab system (https://github.com/TEOS-10/GSW-Matlab). Consult http://www.teos-10.org to learn more about these software systems, their authorships, and the science behind it all.

References

http://www.teos-10.org/pubs/gsw/html/gsw_entropy_from_t.html

See Also

Other things related to entropy: gsw_CT_from_entropy, gsw_entropy_first_derivatives, gsw_entropy_from_pt, gsw_entropy_ice, gsw_pt_from_entropy

Examples

# NOT RUN {
SA <- c(34.7118, 34.8915, 35.0256, 34.8472, 34.7366, 34.7324)
t <- c( 28.7856, 28.4329, 22.8103, 10.2600,  6.8863,  4.4036)
p <- c(      10,      50,     125,     250,     600,    1000)
e <- gsw_entropy_from_t(SA, t, p)
expect_equal(e/1e2, c(4.003894252787245, 3.954381784340642, 3.198664981986740,
                    1.467908815899072, 0.986473408657975, 0.627915087346090))
# }