gsw_pot_enthalpy_ice_freezing_first_derivatives: First Derivatives of Potential Enthalpy

Description Usage Arguments Value Implementation Note References Examples

View source: R/gsw.R

Description

First Derivatives of Potential Enthalpy

Usage

1

Arguments

SA

Absolute Salinity [ g/kg ]

p

sea pressure [dbar], i.e. absolute pressure [dbar] minus 10.1325 dbar

Value

A list containing pot_enthalpy_ice_freezing_SA [ (J/kg)/(g/kg) ], the derivative of potential enthalpy with respect to Absolute Salinity, and pot_enthalpy_ice_freezing_p [ unitless ], the derivative of Conservative Temperature with respect to potential temperature. (Note that the second quantity is denoted pot_enthalpy_ice_freezing_P in the documentation for the Matlab function.)

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_pot_enthalpy_ice_freezing_first_derivatives.html

Examples

1
2
3
4
5
6
7
8
9
SA <- c(34.7118, 34.8915, 35.0256, 34.8472, 34.7366, 34.7324)
p <- c(      10,      50,     125,     250,     600,    1000)
r <- gsw_pot_enthalpy_ice_freezing_first_derivatives(SA, p)
stopifnot(all.equal(r$pot_enthalpy_ice_freezing_SA/1e2,
      c(-1.183484968590718, -1.184125268891200, -1.184619267864844,
      -1.184026131143674, -1.183727706650925, -1.183814873741961)))
stopifnot(all.equal(r$pot_enthalpy_ice_freezing_p/1e-3,
      c(-0.202880939983260, -0.203087335312542, -0.203473018454630,
      -0.204112435106666, -0.205889571619502, -0.207895691215823)))

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