gsw: gsw_Turner_Rsubrho – R documentation

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gsw_Turner_Rsubrho

Turner Angle and Density Ratio

Description

This uses the 75-term density equation. The values of Turner Angle Tu and density ratio Rrho are calculated at mid-point pressures, p_mid.

Usage

gsw_Turner_Rsubrho(SA, CT, p)

Arguments

`SA`	Absolute Salinity [ g/kg ]
`CT`	Conservative Temperature [ degC ]
`p`	sea pressure [dbar], i.e. absolute pressure [dbar] minus 10.1325 dbar

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

List containing Tu [ degrees ], Rsubrho [ unitless ], and p_mid [ dbar ]

References

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

Examples

SA <- c(34.7118, 34.8915, 35.0256, 34.8472, 34.7366, 34.7324)
CT <- c(28.8099, 28.4392, 22.7862, 10.2262,  6.8272,  4.3236)
p <-  c(     10,      50,     125,     250,     600,    1000)
r <- gsw_Turner_Rsubrho(SA, CT, p)
expect_equal(r$Tu, c(-2.063858905281147, 41.758435216784427, 47.606966981687535,
                     53.710351151706369, 45.527063858211527))
expect_equal(r$Rsubrho, 100*c(-0.009304335069039, -0.176564834348709, 0.219627771740757,
                              0.065271424662002, 1.087044054679743))
expect_equal(r$p_mid, 100*c(0.300, 0.875, 1.875, 4.250, 8.000))

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