noresm2_3_develop : add compset NF1850norbc_tropstratchem_aer2014

[DirkOlivie]

Summary: add compset NF1850norbc_tropstratchem_aer2014 - allows to estimate the anthropogenic aerosol ERF

Contributors: Dirk Olivié (@DirkOlivie)

Reviewers: Steve Goldhaber (@gold2718) and Øyvind Seland (@oyvindseland)

Purpose of changes: include extra compset NF1850norbc_tropstratchem_aer2014 (issue #181)

Github PR URL:

Changes made to build system: None

Changes made to the namelist: there is a new use_cases file for the new compset (1850_cam6_noresm_tropstratchem_aer2014.xml).

Changes to the defaults for the boundary datasets: None. But new specific emission files are available for this new compset. However only emission files for the f19 resolution are available. For the f09 resolution, the model will not run as I have put in 1850_cam6_noresm_tropstratchem_aer2014.xml:

<ext_frc_specifier hgrid="0.9x1.25">
  'SPECIES ->  NOTAVAILABLE'
</ext_frc_specifier>

and

<srf_emis_specifier hgrid="0.9x1.25">
  'SPECIES -> NOTAVAILABLE'
</srf_emis_specifier>

Is this a good solution?

Substantial timing or memory changes: None

Detailed description of changes

Issues addressed by this PR:
#181 (noresm2_3_develop : NF1850norbc_tropstratchem_aer2014 compset)

[oyvindseland]

I imagine there are better methods to inform that a compset does not work for a given resolution?
@gold2718