Skip to contents

Convert from Practical Salinity to Absolute Salinity (Baltic)

Source: R/gsw.R
gsw_SA_from_SP_Baltic.Rd

Calculate Absolute Salinity from Practical Salinity, pressure, longitude, and latitude.

Usage

gsw_SA_from_SP_Baltic(SP, longitude, latitude)

Arguments

SP

Practical Salinity (PSS-78) [ unitless ]. The valid range for most `gsw` functions is from 2 to 42.

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

Absolute Salinity [ g/kg ]

Details

If SP is a matrix and if its dimensions correspond to the lengths of longitude and latitude, then the latter are converted to analogous matrices with expand.grid.

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_SA_from_SP_Baltic.html

See also

Other things related to salinity: gsw_C_from_SP(), gsw_SA_from_SP(), gsw_SA_from_Sstar(), gsw_SP_from_C(), gsw_SP_from_SA(), gsw_SP_from_SK(), gsw_SP_from_SR(), gsw_SP_from_Sstar(), gsw_SR_from_SP(), gsw_Sstar_from_SA(), gsw_Sstar_from_SP(), gsw_deltaSA_from_SP()

Examples

SP <- c( 6.5683, 6.6719, 6.8108, 7.2629, 7.4825, 10.2796)
lon <- c(    20,     20,     20,     20,     20,      20)
lat <- c(    59,     59,     59,     59,     59,      59)
SA <- gsw_SA_from_SP_Baltic(SP, lon, lat)
stopifnot(all.equal(SA, c(6.669945432342856, 6.773776430742856, 6.912986138057142,
                          7.366094191885713, 7.586183837142856, 10.389520570971428)))