Forcing options (ocean-only mode)

Presently, POP includes routines for specifying the surface forcing for the velocity, pressure, temperature and salinity as well as interior forcing for temperature and salinity. While it is impossible to anticipate every kind of forcing a user might want, the routines have been constructed so that it should be relatively easy to add new types of forcing by using existing types as a template. In the following sections, these abbreviations apply:

**ws:** wind stress; surface forcing for the horizontal velocity field

**shf:** surface heat flux; surface forcing for the potential temperature equation

**sfwf:** surface fresh water flux; surface forcing for the salinity equation

**ap:** surface pressure forcing due to variations in the atmospheric pressure

**pt_interior:** *interior* forcing for the potential temperature equation

** s_interior:** *interior* forcing for the salinity equation

Sometimes an asterisk (*) will be used as a UNIX-like wildcard.

Each forcing category listed above has a namelist, and a set of options must be specified in each namelist. The options are:

- periodicity
- temporal interpolation method and interval
- formulation
- files containing forcing data
- units of forcing variables
- updating the forcing values

- Periodicity of forcing data
- Temporal interpolation of forcing data
- Forcing formulation

- Forcing files
- Forcing units
- Updating the forcing values
- Forcing modules
- Forcing namelists