gsw_grav: Gravitational Acceleration

Description Usage Arguments Value Implementation Note References Examples

View source: R/gsw.R

Description

Gravitational Acceleration

Usage

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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 2021-03-27 at https://github.com/TEOS-10/GSW-C with git commit 'f7bfebf44f686034636facb09852f1d5760c27f5'. In turn, that 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 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 2021-0706, 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

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

gsw documentation built on July 8, 2021, 1:07 a.m.