gsw (version 1.2-0)

gsw_entropy_ice: Entropy of ice

Description

Entropy of ice

Usage

gsw_entropy_ice(t, p)

Value

entropy [ J/(kg*degC) ]

Arguments

t

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

p

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

Implementation Note

This R function uses a wrapper to a C function contained within the GSW-C system as updated 2022-10-11 at https://github.com/TEOS-10/GSW-C with git commit `657216dd4f5ea079b5f0e021a4163e2d26893371`.

The C function uses data from the library/gsw_data_v3_0.mat file provided in the GSW-Matlab source code, version 3.06-11. Unfortunately, this version of the mat file is no longer displayed on the TEOS-10.org website. Therefore, in the interests of making GSW-R be self-contained, a copy was downloaded from http://www.teos-10.org/software/gsw_matlab_v3_06_11.zip on 2022-05-25, the .mat file was stored in the developer/create_data directory of https://github.com/TEOS-10/GSW-R, and then the dataset used in GSW-R was created based on that .mat file.

Please consult http://www.teos-10.org to learn more about the various TEOS-10 software systems.

References

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

See Also

Other things related to entropy: gsw_CT_from_entropy(), gsw_entropy_first_derivatives(), gsw_entropy_from_pt(), gsw_entropy_from_t(), gsw_pt_from_entropy()

Examples

t <- c(-10.7856, -13.4329, -12.8103, -12.2600,  -10.8863,  -8.4036)
p <- c(      10,       50,      125,      250,      600,      1000)
e <- gsw_entropy_ice(t, p)
stopifnot(all.equal(e/1e3, c(-1.303663820598987, -1.324090218294577, -1.319426394193644,
                             -1.315402956671801, -1.305426590579231, -1.287021035328113)))