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###

`shf_formulation` options:

**'restoring'**
- a simple restoring of the top layer
potential temperature in the model to a data value,
*dT/dt = (T*_{data} - T_{model}) / τ, where *τ*
is a constant time scale. *T*_{data} represents a space-
and possibly time-dependent array of values of sea-surface
temperature (SST) 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
`shf_restore_tau` (in days) also needs to be specified.

**'Barnier-restoring': **
- use the ECMWF heat flux analysis
of [2] arranged in restoring form.
Necessary forcing fields consist of (in order) an effective SST,
spatially varying restoring time scale, sea ice mask, and net
downward short-wave radiation. If this option is
chosen, then it is also necessary to specify the namelist variable
`jerlov_water_type` to calculate the depth of short-wave
penetration.

**'bulk-NCEP': **
- calculate fluxes based on atmospheric state
variables and radiation similar to a fully-coupled model (and
using bulk flux formulations extracted from the NCAR flux coupler).
Necessary forcing fields consist of (in order) SST, air temperature,
air humidity, downward short-wave radiation, cloud fraction, and
wind speed. If this option is chosen, then it is also necessary
to specify the namelist variable
`jerlov_water_type`
to calculate the depth of short-wave penetration. This option also
expects the name of a file used to define different regions of the
ocean (including marginal seas) specified by the namelist variable
`region_mask_filename` in the
grid namelist.

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2010-01-14