Ratio of Absolute to Preformed Salinity, minus 1

Usage

gsw_Fdelta(p, longitude, latitude)

Arguments

p: sea pressure [dbar], i.e. absolute pressure [dbar] minus 10.1325 dbar
longitude: longitude in decimal degrees, positive to the east of Greenwich. (This is called long in the TEOS-10 Matlab code.)
latitude: latitude in decimal degrees, positive to the north of the equator. (This is called lat in the TEOS-10 Matlab code.)

Value

(S/Sstar)-1 [ unitless ]

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_Fdelta.html

Examples

p <- c(         10,   50,  125,  250,  600, 1000)
latitude <- c(   4,    4,    4,    4,    4,    4)
longitude <- c(188,  188,  188,  188,  188,  188)
r <- gsw_Fdelta(p, longitude, latitude)
stopifnot(all.equal(r/1e-3, c(0.006472309923452, 0.010352848168433, 0.025541937543450,
                              0.104348729347986, 0.218678084205081, 0.365415366571266)))