Gravitational Acceleration

Usage

gsw_grav(latitude, p = 0)

Arguments

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

Value

gravitational acceleration [ m/s^2 ]

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_grav.html

Examples

lat <- c(-90, -60, -30, 0)
grav <- gsw_grav(lat)
stopifnot(all.equal(grav, c(9.832186205884799, 9.819178859991149,
                            9.793249257048750, 9.780327000000000)))