gsw_IPV_vs_fNsquared_ratio {gsw} | R Documentation |
Note that the C library had to be patched to get this working; a new version of the library will address the bug directly.
gsw_IPV_vs_fNsquared_ratio(SA, CT, p, p_ref = 0)
SA |
Absolute Salinity [ g/kg ] |
CT |
Conservative Temperature [ degC ] |
p |
sea pressure [dbar], i.e. absolute pressure [dbar] minus 10.1325 dbar |
p_ref |
reference pressure [ dbar ] |
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.
list containing IPV_vs_fNsquared_ratio [ unitless ] and mid-point pressure p_mid [ dbar ]
http://www.teos-10.org/pubs/gsw/html/gsw_IPV_vs_fNsquared_ratio.html
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) p_ref <- 0 r <- gsw_IPV_vs_fNsquared_ratio(SA, CT, p, p_ref) expect_equal(r$IPV_vs_fNsquared_ratio, c(0.999742244888022, 0.996939883468178, 0.986141997098021, 0.931595598713477, 0.861224354872028)) expect_equal(r$p_mid, c(30, 87.5, 187.5, 425, 800))