gsw_pt_from_t_ice function

Potential Temperature of Ice from in-situ Temperature

gsw_pt_from_t_ice(t, p, p_ref = 0)

Arguments

• t: in-situ temperature (ITS-90) [ degC ]
• p: sea pressure [dbar], i.e. absolute pressure [dbar] minus 10.1325 dbar
• p_ref: reference pressure [ dbar ]

Returns

potential temperature [ degC ]

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.

Examples

t <- c(-10.7856, -13.4329, -12.8103, -12.2600, -10.8863, -8.4036)
p <- c(      10,       50,      125,      250,      600,    1000)
p_ref <- 0 # not actually needed, since 0 is the default
pt <- gsw_pt_from_t_ice(t, p, p_ref)
stopifnot(all.equal(pt, c(-10.787787898205272, -13.443730926050661, -12.837427056999676,
                          -12.314321615760921, -11.017040858094234, -8.622907355083147)))

References

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