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The main pitfall in doing this is to be aware of what the coupler and
the other CCSM components expect from the ice model. Any changes that
effect the coupler exchange, in terms of definitions of fields or even
adding/subtracting fields is not recommended. It is best to leave alone
the coupler exchange fields when modifying algorithms unless it is crucial
for the new algorithm. This would then requre major modifications to the
coupler and/or other components, all of which is beyond the scope of this
document.
csm@ucar.edu