How to use different CO2 datasets for CAM and CLM

[chrisbs@umich_edu]

Hi, I am using cesm1.0.6.  I would like to use the "RAMPED" scenario_ghg option.  I am going to modify (quadruple) the transient CO2 concentrations in the file "ghg_hist_1765-2005_c091218.nc", which I have specified with the "bndtvghg" option.  I want CAM to see the modified CO2 concentrations, but I do not want CLM to see the modified CO2 concentrations. I do not want to set the "clm_co2_type" option to "constant". Rather, I want CLM to see the original (non-quadrupled) transient CO2 concentrations specified in "ghg_hist_1765-2005_c091218.nc".  Is there an option for doing this?  Thanks!

 

[zhu467@purdue_edu]

Hi, Do you have solve this problem? I also want to setup different co2 level for land and atm component.

 

[chrisbs@umich_edu]

Unfortunately there is no option for using two different transient CO2 datasets (one for CAM, one for CLM).  You can however modify the code to have CLM read in a different dataset.  I am in the process of figuring out how to do this.  I can post my response if/when I figure it out. 

 

[zhu467@purdue_edu]

Glad to receive your reply! Actuall, I did not need to set up co2 as complex as you, I just want to set up a transient co2 level in land component and a constant co2 level in atm component. But I did know how to setup it.In addition, I find a problem when using B20TRC5CN, which I have posted here.http://bb.cgd.ucar.edu/user/login?destination=/bug-report-unreasonable-land-co2-level-when-using-b20trc5-compsets. I did not know whether you have encountered this problem.