Fixed CO2 & Aerosols

[idunkl]

Hi all!

I have two questions about constant forcing simulations:
a) We ran a simulation with an SSP370 compset and want to repeat it with CO2 and aerosols from the same compset looping over the year 2024. (I don't want to use CCSM_CO2_PPMV or co2vmr because it gives me different results.)

I tried setting everything in the atm namelist ty CYCLICAL:

&prescribed_strataero_nl
prescribed_strataero_cycle_yr = 2024
prescribed_strataero_type = 'CYCLICAL'
&prescribed_ozone_nl
prescribed_ozone_cycle_yr = 2024
prescribed_ozone_type = 'CYCLICAL'
&chem_surfvals_nl
flbc_cycle_yr = 2024
flbc_type = 'CYCLICAL'

But I get an error:

flbc_inti: cyclical lb conds require at least two time points

The second question is a similar problem:
How can I keep aerosols at a constant 1850 level in an FHIST_BGC simulation?

Thank you in advance!
Cheers,
Istvan