noresm3_0_039_cam6_4_121: Adjust namelist defaults for N(F)1850 experiments

[gold2718]

Summary: Adjust namelist default values for N(F)1850 experiments based on recent tuning experiments

Contributors: @oyvindseland, @DirkOlivie

Reviewers: @oyvindseland, @DirkOlivie

Purpose of changes: Interim update of namelist defaults, #283

Github PR URL: #285

Changes made to build system: None

Changes made to the namelist: New default 1 and 2 degree defaults for:

• clubb_c8
• micro_mg_berg_eff_factor
• micro_mg_autocon_lwp_exp
• dust_emis_fact
• zmconv_c0_lnd
• zmconv_c0_ocn
• zmconv_tiedke_add
• use_aerocom

Changes to the defaults for the boundary datasets: None

Substantial timing or memory changes: None

Details: See namelist changes above

Testing:

• aux_cam_noresm on Olivia: All PASS (expected namelist changes introduced in this PR)
• aux_cam_noresm on Betzy: All PASS (expected namelist changes introduced in this PR)

addresses #283

[DirkOlivie]

Hi Steve, I checked the ne16pg3 values. Possibly we should add (for both resolutions the same) :
rh_fine_aer_scale_fact_optics = 1.1

[DirkOlivie]

Hi Steve, for ne30pg3 it seems fine also. I don't know what is the most appropriate value for clubb_c8 but that might still evolve.

[oyvindseland]

Looks correct compared to the latest simulations that I found except that I think the default
for micro_mg_dcs = 600.D-6
I think it 500.D-6 now in the default namelist file now?

@DirkOlivie Is it so that the modifications to size fraction is hardcoded in the model and not in namnelist?

[gold2718]

Looks correct compared to the latest simulations that I found except that I think the default for micro_mg_dcs = 600.D-6 I think it 500.D-6 now in the default namelist file now?

Oddly enough, micro_mg_dcs is not set in namelist_defaults. I'm not sure why (except it would take 9 entries) but it has always been in build_namelist. There, the default is '600.D-6' for phys=cam7. Is that correct?

[gold2718]

@DirkOlivie Is it so that the modifications to size fraction is hardcoded in the model and not in namnelist?

@oyvindseland, Are you talking about rh_fine_aer_scale_fact_optics? That is now in the namelist and is 1.0 by default. I will change the Oslo Aero default to 1.1.

[oyvindseland]

No it is not the rh_fine_aer_scale_fact_optics, but some other settings for dust emissions. I can not see it in the simulations issues so probably hardcoded. Check dcs though.

[gold2718]

Check dcs though.

@oyvindseland, I don't know if you saw this note, but is the default of micro_mg_dcs = 600.D-6 for phys=cam7 correct?

[oyvindseland]

Yes dcs=600 is correct.

[oyvindseland]

The comments on variable have been checked and looks fine

[DirkOlivie]

@gold2718 @oyvindseland I assume you are referring for dust to
emis_fact_in_coarse_mode = 0.97D0
but that is already in namelist_defaults_cam.xml.

For sea-salt it is hard-coded as
real(r8), parameter :: factorlist(numberOfSaltModes) = (/ 0.5_r8, 0.5_r8, 0.75_r8 /)
in oslo_aero_seasalt.F90
and that is also already in.