computed longwave forcing options

[eclare108213]

The Rosati and Miyakoda (RM) longwave forcing doesn’t work right, and I want to try to revert back to the older, much simpler Parkinson and Washington formula for our testing. This will change the answers, and I’ll want to look at the output to see if we really want to do this now, or wait until after the release. This issue has suddenly increased in importance because a post doc at the DOE meeting last week was using the stand alone configuration with RM for science conclusions, not a good idea..... I would like to at least make the RM forcing not the standard option.

[eclare108213]

During the Nov 20 team meeting we decided to leave this as-is in the code, indicate clearly in the documentation that it is a problem, add E's slides describing it to the wiki, and create an issue to replace the COREII forcing with a different forcing data set, in which longwave will not be computed.
The new issue is #249

[eclare108213]

emissivity_tale.pdf

[eclare108213]

This issue is now included in the FAQ:
https://github.com/CICE-Consortium/About-Us/wiki/FAQ-(Frequently-Asked-Questions)#stand-alone-configuration-and-forcing
There might be a better place on the wiki to put it. This seemed appropriate and can be referenced from elsewhere if needed.

It is mentioned in the documentation and in issue #249. We could also add it to the list of "known issues" in the CICE docs, e.g. a new section 3.5.8.