Can WACCM use CO2 surface emission?

[Yuan Wang]

I notice WACCM and CAM-Chem use Lower Boundary Conditions (LBC) concentrations to drive long-lived spices like CO2. But is there a way to direct use CO2 surface emission fluxes like those BPRP component sets?

I tried to turn on co2_flag and co2flux_fuel_file brutally in the namelist, but it doesn't work

Thanks.

 

[BenGaubert]

Dear Yuan,
Note that for running with no prescribed Lower Boundary Conditions (LBC) concentrations,
you need to remove CO2 from the list [ foreach my $ghg ('CO2','CH4', 'N2O','CFC11','CFC12') ] in components/cam/bld/build-namelist

Look for the following paragraph:

# Make sure the flbc_list specifies all the GHGs needed for radiation.
my $flbc_list = $nl->get_value('flbc_list');
if (defined $flbc_list) {
# If flbc_list has already been defined, check that it contains all
# the GHGs needed by the radiation code.
foreach my $ghg ('CO2','CH4', 'N2O','CFC11','CFC12') {
if ($flbc_list !~ /$ghg/) {
die "$ProgName - ERROR: $ghg is missing from flbc_list \n";
}
}
}
else {
my $val = "'CO2','CH4','N2O','CFC11','CFC12'";
add_default($nl, 'flbc_list', 'val'=>$val);
}

I have run CAM-chem with prescribed fluxes of CO2 and CH4, but I am not familiar with the BPRP component sets.
Ben

 

[Yuan Wang]

Dear Yuan,
Note that for running with no prescribed Lower Boundary Conditions (LBC) concentrations,
you need to remove CO2 from the list [ foreach my $ghg ('CO2','CH4', 'N2O','CFC11','CFC12') ] in components/cam/bld/build-namelist

Look for the following paragraph:

# Make sure the flbc_list specifies all the GHGs needed for radiation.
my $flbc_list = $nl->get_value('flbc_list');
if (defined $flbc_list) {
# If flbc_list has already been defined, check that it contains all
# the GHGs needed by the radiation code.
foreach my $ghg ('CO2','CH4', 'N2O','CFC11','CFC12') {
if ($flbc_list !~ /$ghg/) {
die "$ProgName - ERROR: $ghg is missing from flbc_list \n";
}
}
}
else {
my $val = "'CO2','CH4','N2O','CFC11','CFC12'";
add_default($nl, 'flbc_list', 'val'=>$val);
}

I have run CAM-chem with prescribed fluxes of CO2 and CH4, but I am not familiar with the BPRP component sets.
Ben

Dear Ben,

Thanks for this valuable info. As suggested, I removed 'CO2' in the code above, but got the same error message after the model crashed: "ERROR: ADDFLD: CO2&IC already on list".

I'm using a self-defined compset: SSP245_CAM60%CCTS_CLM50%BGC-CROP_CICE_POP2%ECO%ABIO-DIC_MOSART_CISM2%NOEVOLVE_WW3_BGC%BPR. I'm wondering which compset you used for your successful run? Did you make any other modifications in addition to those in build-namelist?

Much appreciated.

Yuan

 

[Yuexuanzi Wang]

Dear Ben,

Thanks for this valuable info. As suggested, I removed 'CO2' in the code above, but got the same error message after the model crashed: "ERROR: ADDFLD: CO2&IC already on list".

I'm using a self-defined compset: SSP245_CAM60%CCTS_CLM50%BGC-CROP_CICE_POP2%ECO%ABIO-DIC_MOSART_CISM2%NOEVOLVE_WW3_BGC%BPR. I'm wondering which compset you used for your successful run? Did you make any other modifications in addition to those in build-namelist?

Much appreciated.

Yuan

Hello, I have met the same problem. Have you ever solved it?

 

[CaliFornia]

Hello, I have met the same problem. Have you ever solved it?

Hi dear Yuexuanzi. I got similar issues here. I am trying to run the model with changing CH4 (similar to your CO2). Did you figured out how to do it?