seacarb (version 3.3.3)

sp2sa_geo: From practical to absolute salinity

Description

Converts from practical to absolute salinity based on depth and geographic location.

Usage

sp2sa_geo(SP, P=0, long=1.e20, lat=1.e20)

Value

SA

Absolute salinity (g/kg)

Arguments

SP

Practical salinity on the practical salinity scale

P

Sea water pressure in dbar

long

Longitude in decimal degrees [ 0 ... +360 ] or [ -180 ... +180 ]

lat

Latitude in decimal degrees [-90 ... 90]

Author

Jean-Marie Epitalon

Details

This function is almost an alias of function gsw_SA_from_SP of the gsw package on which it relies. The only difference is in that depth and location are optional. If location is not given, or incomplete (either longitude or latitude missing), an arbitrary location is chosen: the mid equatorial atlantic ocean. Note that this implies an error on computed SA ranging from 0 up to 0.02 g/kg.

References

McDougall T. J., Jackett D. R., Millero F. J., Pawlowicz R. and Barker P. M., 2012. A global algorithm for estimating Absolute Salinity. Ocean Science 8, 1123-1134.

Pawlowicz R., 2013. What every oceanographer needs to know about TEOS-10 (The TEOS-10 Primer). http://www.teos-10.org/

See Also

sa2sp_geo does the reverse, sp2sa_chem

Examples

   # Calculate the absolute salinity of a sample whose practical Salinity is 35,
   # depth is 10 dbar and location is 188 degrees East and 4 degrees North.
   SA <- sp2sa_geo(35, 10, 188, 4)     # 34.711778344814114