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`sfwf_formulation` options:

**'restoring': **
- a simple restoring of the top layer salinity in
the model to a data value,
*dS/dt = (S*_{data} - S_{model}) / τ, where *τ* is a
time scale. *S*_{data} represents a space- and possibly
time-dependent array of values of sea-surface salinity (SSS) and is
the only necessary forcing field. If this option is chosen, then a
value for the space- and time-*in*dependent restoring
time-scale variable `sfwf_restore_tau` (in days) also needs
to be specified.

**'bulk-NCEP': **
- calculate fluxes based on atmospheric state
variables similar to coupled mode (and using bulk flux formulations
extracted from the NCAR flux coupler). Necessary forcing fields
consist of (in order) SSS and precipitation.If this option is
chosen, it is necessary to also choose 'bulk-NCEP'
for
`shf_formulation` since the evaporation rate (part of
the `sfwf_formulation`) must be proportional to the latent
heat flux (part of the `shf_formulation`).

2010-01-14