gsw_p_from_z: Pressure from height (75-term equation)

Description Usage Arguments Value Implementation Note Historical Note References See Also Examples

View source: R/gsw.R

Description

Pressure from height (75-term equation)

Usage

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gsw_p_from_z(z, latitude, geo_strf_dyn_height, sea_surface_geopotential)

Arguments

z

height, zero at surface (but note last 2 args) and positive upwards [ m ]

latitude

latitude in decimal degrees, positive to the north of the equator. (This is called lat in the TEOS-10 Matlab code.)

geo_strf_dyn_height

vector of same length as z and latitude, indicating dynamic height [ m^2/s^2 ]. If not supplied, this defaults to a vector of 0 values, with length matching that of z.

sea_surface_geopotential

vector of same length as z and latitude, indicating geopotential at zero sea pressure [ m^2/s^2 ]. If not supplied, this defaults to a vector of 0 values, with length matching that of z.

Value

sea pressure [ dbar ]

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.

Historical Note

The geo_strf_dyn_height and sea_surface_geopotential parameters were added in GSW-R version 1.0-6.

References

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

See Also

Other things related to depth: gsw_z_from_p()

Examples

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z <- -c(10, 50, 125, 250, 600, 1000)
latitude <- 4
p <- gsw_p_from_z(z, latitude)
stopifnot(all.equal(p/1e3, c(0.010055726724518, 0.050283543374874, 0.125731858435610,
                             0.251540299593468, 0.604210012340727, 1.007990337692001)))

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