gsw_SP_from_SA {gsw} | R Documentation |
Calculate Practical Salinity from Absolute Salinity, pressure, longitude, and latitude.
gsw_SP_from_SA(SA, p, longitude, latitude)
SA |
Absolute Salinity [ g/kg ] |
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
.
Note: unlike the corresponding Matlab function, this does not return a flag indicating whether the location is in the ocean.
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.
Practical Salinity (PSS-78) [ unitless ]
http://www.teos-10.org/pubs/gsw/html/gsw_SP_from_SA.html
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_SK
,
gsw_SP_from_SR
,
gsw_SP_from_Sstar
,
gsw_SR_from_SP
,
gsw_Sstar_from_SA
,
gsw_Sstar_from_SP
,
gsw_deltaSA_from_SP
SA <- c(34.7118, 34.8915, 35.0256, 34.8472, 34.7366, 34.7324) p <- c( 10, 50, 125, 250, 600, 1000) lat <- c( 4, 4, 4, 4, 4, 4) long <- c( 188, 188, 188, 188, 188, 188) SP <- gsw_SP_from_SA(SA,p,long,lat) expect_equal(SP, c(34.548721553448317, 34.727477488096639, 34.860554877708005, 34.680971112271791, 34.567971663653388, 34.560036751118204))