c14 ratio for soil carbon pools

[ekici@climate_unibe_ch]

Hi,

I am running CLM5 with c13 and c14 options turned on. I have seen that the soil c14 pool is unnaturally high.

I noticed that c14 ratio is not used in the code ( src/soilbiogeochem/SoilBiogeochemCarbonStateType.F90)

for c13 at line 584
> this%decomp_cpools_vr_col(i,j,k) = c12_soilbiogeochem_carbonstate_inst%decomp_cpools_vr_col(i,j,k) * c3_r2

for c14 at line 632 is the same as above
> this%decomp_cpools_vr_col(i,j,k) = c12_soilbiogeochem_carbonstate_inst%decomp_cpools_vr_col(i,j,k) * c3_r2

is c14 pool supposed to use the factor c3_r2 instead of c14ratio?

 

[oleson]

These lines of code are only executed if the model can't find the isotope variable on a restart file (or initial file). Generally, this could happen if you are starting the model with isotopes enabled but using a restart/initial file that doesn't have isotope data on it. Although I thought the model would abort with an error and tell you that. So I doubt these lines of code would be executed.