Ratios of changes in SA, CT and p that occur
when frazil ice forms due to changes in pressure upon
the mixture of seawater and ice.
gsw_frazil_ratios_adiabatic(SA, p, w_Ih)Absolute Salinity [ g/kg ]
sea pressure [dbar], i.e. absolute pressure [dbar] minus 10.1325 dbar
initial mass fraction (ice) / (water + ice)
a list containing dSA_dCT_frazil, dSA_dP_frazil and dCT_dP_frazil.
This R function uses a wrapper to a C function contained within the GSW-C system as updated 2021-12-28 at https://github.com/TEOS-10/GSW-C with git commit `98f0fd40dd9ceb0ba82c9d47ac750e935a7d0459`.
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.
SA <- c( 34.7118, 34.8915, 35.0256, 34.8472, 34.7366, 34.7324)
p <- c( 10, 50, 125, 250, 600, 1000)
w_Ih <- c( 0.9, 0.84, 0.4, 0.25, 0.05, 0.01)
r <- gsw_frazil_ratios_adiabatic(SA, p, w_Ih)
stopifnot(all.equal(r$dSA_dCT_frazil,
c(3.035152370800401, 1.932548405396193, 0.613212115809003,
0.516103092738565, 0.436656742034200, 0.425827266533876)))
stopifnot(all.equal(r$dSA_dP_frazil/1e-6,
c(-0.197406834470366, -0.133213926580032, -0.045580136143659,
-0.038806356507548, -0.033541272953744, -0.033350141194082)))
stopifnot(all.equal(r$dCT_dP_frazil/1e-7,
c(-0.650401727338347, -0.689317412221414, -0.743301297684333,
-0.751910946738026, -0.768138213038669, -0.783184728059898)))