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##

Periodicity of forcing data

First, the user must decide on the periodicity (or 'type')
of the data that will force the model, for example, an annual
mean climatology or a re-analysis product available every day.
This choice is specified by the namelist variables
`*_data_type` where * denotes each of
`ws, shf, sfwf,`etc. The options for `data_type` are:

**'none': ** no forcing

**'analytic': ** a time-invariant analytic form for the forcing

**'annual': ** a time-invariant annual mean forcing

**'monthly-equal': ** a monthly mean climatology assumed to
consist of 12 values that are separated equally
in time by 365/12 = 30.4166 days.This was
included mostly for backward compatibility.

**'monthly-calendar': ** a monthly mean climatology whose 12
values correspond to the non-leap-year calendar

**'monthly': ** synonymous with 'monthly-calendar'

**'n-hour': ** forcing is specified every 'n' equally spaced
hours. If this is chosen, the user must also
specify a value for `*_data_inc`
which is the increment (in hours) between
consecutive values of the forcing data. For
example, `ws_data_inc` =24 denotes daily
wind stress forcing. The value of `*_data_inc`
is disregarded for all of the other
`*_data_type` options.

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2010-01-14