gsw: gsw_frazil_ratios_adiabatic – R documentation

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gsw_frazil_ratios_adiabatic

Ratios of SA, CT and p changes when Frazil Ice Forms

Description

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.

Usage

gsw_frazil_ratios_adiabatic(SA, p, w_Ih)

Arguments

`SA`	Absolute Salinity [ g/kg ]
`p`	sea pressure [dbar], i.e. absolute pressure [dbar] minus 10.1325 dbar
`w_Ih`	initial mass fraction (ice) / (water + ice)

Details

The present R function works with a wrapper to a C function contained within the GSW-C system (Version 3.05-4 dated 2017-08-07, available at https://github.com/TEOS-10/GSW-C, as git commit '5b4d959e54031f9e972f3e863f63e67fa4f5bfec'), which stems from the GSW-Fortran system (https://github.com/TEOS-10/GSW-Fortran) which in turn stems from the GSW-Matlab system (https://github.com/TEOS-10/GSW-Matlab). Consult http://www.teos-10.org to learn more about these software systems, their authorships, and the science behind it all.

Value

a list containing dSA_dCT_frazil, dSA_dP_frazil and dCT_dP_frazil.

References

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

Examples

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)
expect_equal(r$dSA_dCT_frazil, c(3.035152370800401, 1.932548405396193, 0.613212115809003,
                               0.516103092738565, 0.436656742034200, 0.425827266533876))
expect_equal(r$dSA_dP_frazil/1e-6, c(-0.197406834470366, -0.133213926580032, -0.045580136143659,
                              -0.038806356507548, -0.033541272953744, -0.033350141194082))
expect_equal(r$dCT_dP_frazil/1e-7, c(-0.650401727338347, -0.689317412221414, -0.743301297684333,
                                   -0.751910946738026, -0.768138213038669, -0.783184728059898))

gsw

Gibbs Sea Water Functions

v1.0-5

GPL (>= 2) | file LICENSE

Authors

Dan Kelley [aut, cre, cph] (C wrapper plus R code, tests, and documentation), Clark Richards [aut, cph] (C wrapper plus R code, tests, and documentation), WG127 SCOR/IAPSO [aut, cph] (Original 'Matlab' and derived code)

Initial release

2017-08-08