1pct increse CO2 run since 2000

[Eun-Jo SONG]

Hello,

I have been tring to run CO2 1PCT increase since 2000 experiments run using “2000_CAM60%1PCT_CLM50%BGC_CICE_POP2%ECO%ABIO-DIC_MOSART_CISM2%NOEVOLVE_WW3_BGC%BPRP”, (I have successfully completed CTRL_RUN using “2000_CAM60_CLM50%BGC_CICE_POP2%ECO%ABIO-DIC_MOSART_CISM2%NOEVOLVE_WW3_BGC%BPRP”.), but there are some problems after submitting case. Cesm.log states “ERROR: flbc_inti: cannot specify flbc_cycle_yr if flbc_type is not CYCLICAL”. I think that this log implies that the problem may be a conflict between the compset configurations, (e.g. 2000 and cam6%1pct). Indeed, CO2 concentration is constant in piControl, but has a distribution with latitude and time in “2000 experiment”.

How can I solve this problem? Could I get some advice?

For the better understanding, attaching my cesm.log file below:



Thank you.

 

[nusbaume]

Hi Eun-Jo,

You are correct that there is a conflict in the lower boundary condition flux (flbc) settings between compsets for the Year 2000, which assumes cyclical boundary conditions (i.e. the forcings repeat themselves after a certain period of time), and the 1PCT greenhouse gas compsets, which assumes that the forcings will change every month/year.

I believe you can get around this by specifying exactly what you want in your user_nl_cam file. I think for a 1% CO2 increase-type run you'll want to add the following:

flbc_type='SERIAL'
flbc_file='$DIN_LOC_ROOT/atm/waccm/lb/LBC_CMIP6_1pctCO2_y1-165_GlobAnnAvg_0p5degLat_c180929.nc'
flbc_list='CO2','CH4','N2O','CFC11eq','CFC12'

Please note that the listed flbc_file starts with year 1850 concentrations, so you may need to create your own file to better match year 2000 values.

Finally, if the above the suggestion doesn't fix your issue then please let us know.

Thanks, and have a great day!

Jesse

 

[Eun-Jo SONG]

Dear Jesse,

The problem is solved due to your comment.
Thank you very much!

Sincerely.


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