Taken from Section 2.2 in "RCO - Rossby Centre regional Ocean
climate model: model description (version 1.0) and
first results from the hindcast period 1992/93"
Multiplication by area fraction lead to a too weak radiation flux.
Since flux is a density-like quantity there must not be a multiplication
with fraction of area.
The too cold bottom model seems to be fixed by this.
If not specified in flux_calculator.nml,
the default values are determined by build configuration.
1 for release and 2 for debug.
Using debug level, the fluxes will be exported as netcdf files.
Variables which are not sent uniformly to the bottom model
are not uniformly sent to the atmosphere. In that case they are averaged.
Since commit 877ec0c0b0 the averaging
is done directly before sending.
Thus it is now removed from flux-calculating routines.
The averaging is also done on the u- and v-grid. For that purpose
the fraction of area variable has to be regridded.
This should be switched on the flux_calculator.nml from now on.
Seemingly the flux_calculator has a problem if it sends and receives a
variable with the same name to/from atmosphere.
Maybe this problem can be solved more elegantly.
Introduced a command-line argument such that flux_calculator only generates
the namcouple and does nothing else.
The executable with this switch has to be started in advance to the actual model run
(then without the switch)
