Convert from Practical Salinity to Preformed Salinity
Calculate Preformed Salinity from Practical Salinity, pressure, longitude, and latitude.
gsw_Sstar_from_SP(SP, p, longitude, latitude)
SP |
Practical Salinity (PSS-78) [ unitless ] |
p |
sea pressure [dbar], i.e. absolute pressure [dbar] minus 10.1325 dbar |
longitude |
longitude in decimal degrees, positive to the east of Greenwich. (This
is called |
latitude |
latitude in decimal degrees, positive to the north of the equator. (This
is called |
If SP is a matrix and if its dimensions correspond to the
lengths of longitude and latitude, then the latter are
converted to analogous matrices with expand.grid.
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.
Preformed Salinity [ g/kg ]
Other things related to salinity: gsw_C_from_SP,
gsw_SA_from_SP_Baltic,
gsw_SA_from_SP,
gsw_SA_from_Sstar,
gsw_SP_from_C,
gsw_SP_from_SA,
gsw_SP_from_SK,
gsw_SP_from_SR,
gsw_SP_from_Sstar,
gsw_SR_from_SP,
gsw_Sstar_from_SA,
gsw_deltaSA_from_SP
SP <- c(34.5487, 34.7275, 34.8605, 34.6810, 34.5680, 34.5600)
p <- c( 10, 50, 125, 250, 600, 1000)
lat <- c( 4, 4, 4, 4, 4, 4)
long <- c( 188, 188, 188, 188, 188, 188)
Sstar <- gsw_Sstar_from_SP(SP,p,long,lat)
expect_equal(Sstar, c(34.711553680880769, 34.891161395333754, 35.024650265047370,
34.843593141519356, 34.729033995955525, 34.719675962471783))Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.