How to run a branch run with transient atm CO2?

[shiannder]

I am running CESM 2.2 compset G1850ECOIAF with modified seafloor iron flux with carbon isotopes turned on (DO13, DO14C) at University of New Hampshire Marvin cluster.

I have a model run (jsl.012) out to year 9982. Now I am trying to run 2 different branch runs with this model after reaching steady state conditions for the carbon isotopes.

I am not able to run both branch runs with the code below. I follow directions from https://www2.cesm.ucar.edu/models/ccsm4.0/ccsm_doc/x2443.html
Instead of "env_conf.xml" I use "env_run.xml" since I do not that the "env_conf.xml" file. However, the actual env_run.xml file doesnt change any values and the I get Dependency never met.

• ./xmlchange --file env_run.xml --id RUN_TYPE --val branch
• ./xmlchange --file env_run.xml --id RUN_REFCASE --val jsl.012
• ./xmlchange --file env_run.xml --id RUN_REFDATE --val 9983-01-01-00000

Branch 1) use transient 1850-2015 atmosphere CO2 values instead of the constant atmosphere CO2

• The nc files are downloaded from NCAR (atm_delta_C13_CMIP6_1980-2015_yearly_v2.0_c190528.nc and atm_delta_C14_CMIP6_1980-2015_yearly_v2.0_c190528.nc)
• 
• ./xmlchange --file env_run.xml --id OCN_CO2_TYPE --val diagnostic : uses a transient atm CO2 I believe.

Branch 2) keep constant atmosphere CO2

• Removed this code: ./xmlchange --file env_run.xml --id OCN_CO2_TYPE --val diagnostic

I have attached my run procedure for both branch runs. My old runs with DNM include (jsl.042-jsl.051) with small modifications trying to understand the model error. For reference,

• jsl.050: ciso=true, transient atm CO2
• jsl.051: ciso=true, no transient atm CO2

Is my branch code running the correct file "env_run.xml" and order?

Thank you