MIMICS related parameters missing name and units in paramfile

[ecaas]

Currently, most MIMICS parameters in file "ctsm51_params.c211112.nc" are missing both long names and units.

Another minor thing, somewhat related; the comment in the line below refers to Wieder et al 2015 in which the parameters are actually multiplied (Eq. 2), not divided. Referring to the testbed version instead would reduce confusion.

CTSM/src/soilbiogeochem/SoilBiogeochemDecompCascadeMIMICSMod.F90

Line 93 in 56878b6

real(r8), private :: kmod_l1_m1 ! kmod = ak / kmod from Wieder et al 2015

[slevis-lmwg]

Something else that I came across that may need updating in restart files for use with MIMICS:
decomp_cascade_state

[slevis-lmwg]

Add this reference for mimics_densdep:
Georgiou, K.,et al. Nat Commun (2017). https://doi.org/10.1038/s41467-017-01116-z
and a comment in the MIMICS code that mimics_densdep = 1 so as to have no effect currently.

Make fchem_p1= fchem_p3 * fchem_p1 in the params file. See /glade/u/home/slevis/paramfiles/ctsm51_params.RMfchem.c230909.nc.
Make length fchem = 2 from 4 in paramfile and code. Change the code accordingly.
@slevis-lmwg confirmed that this changes answers from baseline for mimics cases (roundoff due to changed order of operations).

See https://docs.google.com/spreadsheets/d/1micmd__4E58YA9q414KjPPvTcIimZpCO42Pe3KfK7ms/edit#gid=0
for mimics param long names and units.

[slevis-lmwg]

Reminder that we want to include the above param file mods in #2040
All changes are summarized in the above post.

Update: This issue appears in a card with non-answer-changing params file changes and in a card with answer-changing params file changes.