Barron Henderson, Lyssa Freese, and Patrick Campbell provided updated
EPA NEI2016 emissions for incorporation into GEOS-Chem. These are to
replace the NEI2011 emissions currently in HEMCO_Config.rc. This inventory
(denoted NEI2016_MONMEAN) is off by default in favor of the CEDS v2 global
anthropogenic emissions which extend to 2019.

For this inventory, the text from the EPA_Config.rc file provided by Barron
has been copied into HEMCO_Config.rc. Fixes made to that text include:
(1) adding entries for SOAP and pFe and (2) removing unnecessary
scale factors 256 and 256 for BCPO and OCPO.

NOTE: Currently mask 1007 (CONUS_MASK) is used for the NEI2016 entries, but
there are fields named for "can" and "mex" containing emissions over Canada
and Mexico. We have added a note to HEMCO_Config.rc instructing users to
revert to the old mask files if they would like to use the emissions over
Canada and Mexico.

For more details, see feature request #547

Signed-off-by: Melissa Sulprizio <mpayer@seas.harvard.edu>

Annual scaling factors for NEI2016 emissions were computed from the EPA
Trends Report for Tier 1 CAPS (obtained 21 Sep 2021). Calculations can be
viewed in ExtData/HEMCO/NEI2016/v2021-06/national_tier1_caps+HEMCOscaling.xlsx.
Values were computed from the "Total without wildfires" field. NH3 and PM2.5
only had annual emission totals without wildfires for 2002-2020, while the
remaining species had annual values for 1990-2020. We include only 2002-2020
scale factors here so all species are consistent. Cl2 and HCl were not
included in the Tier 1 CAPS file, so they are not scaled to other years and
are only applied for 2016.

Signed-off-by: Melissa Sulprizio <mpayer@seas.harvard.edu>