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gsw is an R package that provides a connection to software relating to TEOS,the Thermodynamic Equation Of Seawater (seehttp://www.teos-10.org). Thisconnection involves R wrappers to C functions within the GSW-C library(https://github.com/TEOS-10/GSW-C, release v3.06-16-0, commit657216dd4f5ea079b5f0e021a4163e2d26893371), along with a data file within theGSW-Matlab library(https://github.com/TEOS-10/GSW-Matlab/blob/master/Toolbox/library/gsw_data_v3_0.mat,commit 38c9635d6fd93e74c2648e4ee23cec49c1f58530).

The foundational algorithms upon which both GSW-C and GSW-R rest were devisedby the Scientific Committee on Oceanic Research / International Association forthe Physical Sciences of the Oceans, Working Group 127. These algorithms wererecommended as a replacement for a previous system (called UNESCO-80) at thetwenty-fifth assembly in the Intergovernmental Oceanographic Commission in2009.

The gsw functions reproduce test values in the GSW-Matlab documentation to atolerance of 1.5e-8, the default for numerical comparison in R working on a64-bit machine. This offers some assurance that the coding process has notintroduced errors.

The naming convention in gsw is patterned on the system described athttp://www.teos-10.org/pubs/gsw/html/gsw_contents.html, as a way to reducethe effort users might face in switching to R.