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cam6_4_185: Upper boundary conditions of Q #1602

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5e1da07
Check for fixed Q concentration upper boundary condition
fvitt Jun 25, 2026
b2cf963
Remove Q from default UBC for cam7 configurations
fvitt Jun 26, 2026
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12 changes: 10 additions & 2 deletions bld/build-namelist
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Original file line number Diff line number Diff line change
Expand Up @@ -2962,9 +2962,17 @@ if ($maxzen>0.0) {
# upper boundary specifier
my $ubc_ver;
if (($chem =~ /waccm_ma/ or $chem =~ /waccm_tsmlt/ or $chem =~ /waccm_t4ma/) and !$waccmx) {
$ubc_ver = 'waccmchem';
if ($phys =~ /cam7/) {
$ubc_ver = 'waccm7chem';
} else {
$ubc_ver = 'waccmchem';
}
} elsif ($chem =~ /waccm_sc/ or ($model_top eq "ht" and $chem =~ /ghg_mam/)) {
$ubc_ver = 'waccmsc';
if ($phys =~ /cam7/) {
$ubc_ver = 'waccm7sc';
} else {
$ubc_ver = 'waccmsc';
}
}
if (defined $ubc_ver) {
add_default($nl, 'ubc_specifier', 'ver'=>$ubc_ver);
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7 changes: 7 additions & 0 deletions bld/namelist_files/namelist_defaults_cam.xml
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Expand Up @@ -2098,6 +2098,13 @@
<ubc_specifier ver="waccmsc">
'T->MSIS','Q->2.d-8vmr','CH4->2.d-10vmr'
</ubc_specifier>
<!-- WACCM7 -- do not include water vapor for now -->
<ubc_specifier ver="waccm7chem">
'T->MSIS','CH4->2.d-10vmr','F->1.0D-15mmr','HF->1.0D-15mmr','H->MSIS','N->MSIS','O->MSIS','O2->MSIS','H2->TGCM','NO->SNOE'
</ubc_specifier>
<ubc_specifier ver="waccm7sc">
'T->MSIS','CH4->2.d-10vmr'
</ubc_specifier>

<!-- Boundary data for Tropopheric Chemistry -->
<fstrat_file >atm/cam/chem/trop_mozart/ub/ubvals_b40.20th.track1_1996-2005_c110315.nc</fstrat_file>
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2 changes: 2 additions & 0 deletions bld/namelist_files/use_cases/1850_cam_lt.xml
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Expand Up @@ -12,10 +12,12 @@
<flbc_list>'CO2','CH4','N2O','CFC11','CFC12','CFC11eq'</flbc_list>

<!-- Low top upper boundary conditions -->
<!-- Remove for now
<ubc_specifier>'Q:H2O->UBC_FILE'</ubc_specifier>
<ubc_file_path>atm/cam/chem/ubc/b.e21.BWHIST.f09_g17.CMIP6-historical-WACCM.ensAvg123.cam.h0zm.H2O.1849-2014_c240604.nc</ubc_file_path>
<ubc_file_input_type>CYCLICAL</ubc_file_input_type>
<ubc_file_cycle_yr>1850</ubc_file_cycle_yr>
-->

<!-- ozone data : -->
<prescribed_ozone_datapath> 'atm/cam/ozone_strataero' </prescribed_ozone_datapath>
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2 changes: 2 additions & 0 deletions bld/namelist_files/use_cases/hist_cam_lt.xml
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Expand Up @@ -11,9 +11,11 @@
<flbc_list>'CO2','CH4','N2O','CFC11','CFC12','CFC11eq'</flbc_list>

<!-- Low top upper boundary conditions -->
<!-- Remove for now
<ubc_specifier>'Q:H2O->UBC_FILE'</ubc_specifier>
<ubc_file_path>atm/cam/chem/ubc/b.e21.BWHIST.f09_g17.CMIP6-historical-WACCM.ensAvg123.cam.h0zm.H2O.1849-2014_c240604.nc</ubc_file_path>
<ubc_file_input_type>'SERIAL'</ubc_file_input_type>
-->

<!-- ozone data -->
<prescribed_ozone_datapath> 'atm/cam/ozone_strataero' </prescribed_ozone_datapath>
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7 changes: 5 additions & 2 deletions src/physics/cam7/physpkg.F90
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Expand Up @@ -159,12 +159,14 @@ subroutine phys_register
use surface_emissions_mod, only: surface_emissions_reg
use elevated_emissions_mod, only: elevated_emissions_reg
use ctem_diags_mod, only: ctem_diags_reg
use upper_bc, only: ubc_fixed_conc

!---------------------------Local variables-----------------------------
!
integer :: m ! loop index
integer :: mm ! constituent index
integer :: nmodes
logical :: has_fixed_ubc ! for upper bndy cond
!-----------------------------------------------------------------------

! Get physics options
Expand All @@ -191,11 +193,12 @@ subroutine phys_register
! Register water vapor.
! ***** N.B. ***** This must be the first call to cnst_add so that
! water vapor is constituent 1.
has_fixed_ubc = ubc_fixed_conc('Q') ! check for fixed concentration upper boundary condition
if (moist_physics) then
call cnst_add('Q', mwh2o, cpwv, 1.E-12_r8, mm, &
call cnst_add('Q', mwh2o, cpwv, 1.E-12_r8, mm, fixed_ubc=has_fixed_ubc, &
longname='Specific humidity', readiv=.true., is_convtran1=.true.)
else
call cnst_add('Q', mwh2o, cpwv, 0.0_r8, mm, &
call cnst_add('Q', mwh2o, cpwv, 0.0_r8, mm, fixed_ubc=has_fixed_ubc, &
longname='Specific humidity', readiv=.false., is_convtran1=.true.)
end if

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