Old aerosol bug fix (tr_aero).

[dabail10]

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PR checklist

• Short (1 sentence) summary of your PR:
  This is a bug fix to the old aerosol scheme (tr_aero). Some quantities were divided by aice and should not have been.
• Developer(s):
  dabail10 (D. Bailey)
• Suggest PR reviewers from list in the column to the right.
• Please copy the PR test results link or provide a summary of testing completed below.
  https://github.com/CICE-Consortium/Test-Results/wiki/icepack_by_mach_forks#izumi
• How much do the PR code changes differ from the unmodified code?
  • bit for bit
  • [X ] different at roundoff level
  • more substantial
• Does this PR create or have dependencies on CICE or any other models?
  • Yes
  • No
• Does this PR add any new test cases?
  • Yes
  • No
• Is the documentation being updated? ("Documentation" includes information on the wiki or in the .rst files from doc/source/, which are used to create the online technical docs at https://readthedocs.org/projects/cice-consortium-cice/.)
  • Yes
  • No, does the documentation need to be updated at a later time?
    • Yes
    • No
• Please provide any additional information or relevant details below:

The only Icepack test in the base_suite that is not bfb is the pondcesm test. Also, in the CICE base_suite the only test that is not bfb is the alt04. Curiously alt03 is bfb even though tr_aero is on here. There is some interaction of the topographic ponds and the aerosols that I have not figured out. Here are the QC results from alt04. They passed. This addresses Issue CICE-Consortium/CICE#483

[eclare108213]

I don't fully understand why this is wrong but will take your word for it! I think the confusion is related to CICE-Consortium/CICE#67

[dabail10]

This impacts fluxes like melts, congel, snoice, etc. These are m/s fluxes from the thermodynamics are are not "volume" related. So, they don't need to be divided by aice.