sa2sp_geo {seacarb}

From absolute to practical salinity

Description

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

Usage

sa2sp_geo(SA, P=0, long=1.e20, lat=1.e20)

Arguments

SA

Absolute salinity in g/kg

P

Sea water pressure in dbar

long

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

lat

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

Details

This function is almost an alias of subroutine gsw_SP_from_SA from 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.

Value

SP

Practical salinity (psu)

Author(s)

Jean-Marie Epitalon

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

sp2sa_geo does the reverse, sa2sp_chem

Examples

   # Calculate the practical salinity of a sample whose absolute Salinity is 35,
   # depth is 10 dbar and location is 188 degrees East and 4 degrees North.
   SP <- sa2sp_geo(35, 10, 188, 4)