diff --git a/bld/build-namelist b/bld/build-namelist
index 29777bc449..f6a87f4047 100755
--- a/bld/build-namelist
+++ b/bld/build-namelist
@@ -3399,7 +3399,7 @@ if ($cfg->get('microphys') =~ /^mg/) {
$micro_mg_dcs = '500.D-6';
}
elsif ($phys eq 'cam7') {
- $micro_mg_dcs = '600.D-6';
+ $micro_mg_dcs = '450.D-6';
}
}
@@ -3926,10 +3926,10 @@ if ($waccm_phys or
add_default($nl, 'use_gw_front' , 'val'=>'.true.');
$use_gw_convect_dp = '.true.';
#WACCM value
- my $hdepth_scaling = '0.25D0' ;
+ my $hdepth_scaling = '0.29D0' ;
#MT value
if ($cfg->get('model_top') eq 'mt') {
- $hdepth_scaling = '0.32D0';
+ $hdepth_scaling = '0.29D0'
}
my $qbo_forcing = '.false.';
if ($dyn eq 'fv') {
@@ -3952,7 +3952,7 @@ if ($waccm_phys or
# cam7 settings for model_top = 'lt'
add_default($nl, 'use_gw_front' , 'val'=>'.true.');
$use_gw_convect_dp = '.true.';
- add_default($nl, 'gw_qbo_hdepth_scaling', 'val'=>'0.32D0');
+ add_default($nl, 'gw_qbo_hdepth_scaling', 'val'=>'0.29D0');
} else {
add_default($nl, 'use_gw_front' , 'val'=>'.false.');
}
diff --git a/bld/namelist_files/namelist_defaults_cam.xml b/bld/namelist_files/namelist_defaults_cam.xml
index 75acdede44..b5c48835fb 100644
--- a/bld/namelist_files/namelist_defaults_cam.xml
+++ b/bld/namelist_files/namelist_defaults_cam.xml
@@ -824,12 +824,12 @@
1.0D0
1.0D0
-0.5D0
-0.5D0
+0.75D0
+0.75D0
1.0D0
-0.5D0
-0.5D0
+0.75D0
+0.75D0
0.03D0
@@ -899,6 +899,7 @@
0.1d0
0.01d0
1.0d0
+ 1.5d0
65000.0d0
32500.0d0
1
@@ -2094,7 +2095,7 @@
share/meshes/fv0.9x1.25_141008_polemod_ESMFmesh.nc
lnd/clm2/ndepdata/fndep_clm_hist_b.e21.BWHIST.f09_g17.CMIP6-historical-WACCM.ensmean_1849-2015_monthly_0.9x1.25_c180926.nc
-lnd/clm2/ndepdata/fndep_clm_WACCM6_CMIP6piControl001_y21-50avg_1850monthly_0.95x1.25_c180802.nc
+atm/cam/chem/trop_strat_mam5_ts4_aero_spinup/ndep/fndep_clm_B1850C_MT4s.1850monthly.ne30_c251220.nc
.false.
@@ -2186,6 +2187,7 @@
0.75
0.5
0.3
+ 0.280
0.125
1.25
0.25
@@ -2376,6 +2378,7 @@
1.D0
1.D0
+ 0.731D0
0.01D0
0.01D0
@@ -2383,8 +2386,9 @@
-1.1D0
-1.1D0
- 2.47D0
- 2.47D0
+ 2.47D0
+ 2.47D0
+ 2.37D0
2.D0
@@ -2392,8 +2396,10 @@
1.D0
1.D0
+ 0.9D0
1.D0
+ 1.5D0
0.2D0
0.1D0
@@ -2407,6 +2413,7 @@
25.D-6
1.D0
+ 1.39D0
1.D0
1.D0
@@ -2528,7 +2535,7 @@
0.45D0
0.45D0
0.88D0
-4.00D0
+3.20D0
0.75D0
4.00D0
1.13D0
@@ -2539,22 +2546,20 @@
0.55D0
0.22D0
1.75D0
-4.00D0
-4.00D0
-2.0D0
-4.0D0
+3.20D0
+3.20D0
+2.0D0
+3.2D0
2.0D0
4.0D0
-2.0D0
-4.0D0
2.0D0
4.0D0
2.0D0
-4.0D0
+3.2D0
2.0D0
4.0D0
1.75D0
-4.0D0
+3.2D0
0.65D0
4.0D0
@@ -2722,7 +2727,7 @@
0.14D0
0.10D0
0.10D0
- 0.05D0
+ 0.129D0
0.10D0
0.10D0
@@ -2850,7 +2855,7 @@
0.0035D0
0.0035D0
0.0075D0
- 0.0075D0
+ 0.00549D0
0.0035D0
0.0035D0
diff --git a/doc/ChangeLog b/doc/ChangeLog
index c71906ad22..44ec7d2501 100644
--- a/doc/ChangeLog
+++ b/doc/ChangeLog
@@ -1,3 +1,90 @@
+
+===============================================================
+
+Tag name: cam6_4_157
+Originator(s): cacraigucar
+Date: Mar 20, 2026
+One-line Summary: namelist changes to support spin-up run
+Github PR URL: https://github.com/ESCOMP/CAM/pull/1509
+
+Purpose of changes (include the issue number and title text for each relevant GitHub issue):
+ - Update the namelist to match Cecile's settings for the spin-up run: https://github.com/ESCOMP/CAM/issues/1507
+ - Update 1850 aerosol and ndep datasets for CAM: https://github.com/ESCOMP/CAM/issues/1499
+
+Describe any changes made to build system: N/A
+
+Describe any changes made to the namelist: namelist tunings per issue 1507
+
+List any changes to the defaults for the boundary datasets: N/A
+
+Describe any substantial timing or memory changes: N/A
+
+Code reviewed by: PeterHjortLauritzen, nusbaume
+
+List all files eliminated: N/A
+
+List all files added and what they do: N/A
+
+List all existing files that have been modified, and describe the changes:
+M bld/build-namelist
+M bld/namelist_files/namelist_defaults_cam.xml
+ - namelist settings modified
+
+If there were any failures reported from running test_driver.sh on any test
+platform, and checkin with these failures has been OK'd by the gatekeeper,
+then copy the lines from the td.*.status files for the failed tests to the
+appropriate machine below. All failed tests must be justified.
+
+derecho/intel/aux_cam:
+ FAIL ERI_D_Ln18.ne16pg3_ne16pg3_mt232.FHIST_C4.derecho_intel.cam-outfrq3s_eri
+ - pre-existing failure
+ ERI bug in CICE -- See: https://github.com/ESCOMP/CESM_CICE/issues/34
+
+ ERC_D_Ln9.mpasa120_mpasa120.FHISTC_LTso.derecho_intel.cam-outfrq9s_mpasa120 (Overall: DIFF) details:
+ ERC_D_Ln9.mpasa120_mpasa120.QPC7.derecho_intel.cam-outfrq9s_mpasa120 (Overall: DIFF) details:
+ ERC_D_Ln9.ne30pg2_ne30pg2_mt232.QPC7.derecho_intel.cam-outfrq9s (Overall: DIFF) details:
+ ERC_D_Ln9.ne30pg3_ne30pg3_mt232.F1850C_LTso.derecho_intel.cam-outfrq9s (Overall: DIFF) details:
+ ERI_D_Ln18.ne30pg3_ne30pg3_mt232.FHISTC_LTso.derecho_intel.cam-outfrq3s_eri (Overall: DIFF) details:
+ ERP_D_Ln9.ne30pg3_ne30pg3_mt232.F1850C_MTso.derecho_intel.cam-outfrq9s (Overall: DIFF) details:
+ ERP_Ld3.ne16pg3_ne16pg3_mg17.FHISTC_WAt1ma.derecho_intel.cam-reduced_hist1d (Overall: DIFF) details:
+ ERP_Ld3.ne30pg3_ne30pg3_mt232.FHISTC_MTt4s.derecho_intel.cam-outfrq1d_aoa (Overall: DIFF) details:
+ ERP_Ln9.f19_f19_mg17.FWsc1850.derecho_intel.cam-outfrq9s (Overall: DIFF) details:
+ ERP_Ln9.ne30pg3_ne30pg3_mg17.FHISTC_WAma.derecho_intel.cam-outfrq9s (Overall: DIFF) details:
+ ERR_Ln9.ne16pg3_ne16pg3_mt232.FHISTC_LTso.derecho_intel.cam-outfrq9s_bwic (Overall: DIFF) details:
+ ERS_Ln9.f09_f09_mg17.FX2000.derecho_intel.cam-outfrq9s (Overall: DIFF) details:
+ ERS_Ln9.ne30pg3_ne30pg3_mg17.FHISTC_WXma.derecho_intel.cam-outfrq9s_ctem (Overall: DIFF) details:
+ SMS_C2_D_Ln9.ne16pg3_ne16pg3_mg17.FHISTC_WXma.derecho_intel.cam-outfrq9s (Overall: DIFF) details:
+ SMS_D_Ln9.ne16_ne16_mg17.QPX2000.derecho_intel.cam-outfrq9s_amie (Overall: DIFF) details:
+ SMS_D_Ln9.ne30pg3_ne30pg3_mt232.FHISTC_MTso.derecho_intel.cam-outfrq9s (Overall: DIFF) details:
+ SMS_D_Ln9_P1280x1.ne30pg3_ne30pg3_mt232.FHISTC_MTt1s.derecho_intel.cam-outfrq9s_Leung_dust (Overall: DIFF) details:
+ SMS_Ld1.f09_f09_mg17.FW2000climo.derecho_intel.cam-outfrq1d (Overall: DIFF) details:
+ SMS_Ln9.f09_f09_mg17.FW1850.derecho_intel.cam-reduced_hist3s (Overall: DIFF) details:
+ SMS_Ln9.ne30pg3_ne30pg3_mg17.FW2000climo.derecho_intel.cam-outfrq9s_rrtmgp (Overall: DIFF) details:
+ - Namelist and answer differences expected for CAM7
+
+derecho/nvhpc/aux_cam:
+ ERS_Ln9.ne30pg3_ne30pg3_mt232.FHISTC_LTso.derecho_nvhpc.cam-outfrq9s_gpu_default (Overall: DIFF) details:
+ - Namelist and answer differences expected for CAM7
+
+izumi/nag/aux_cam:
+ ERC_D_Ln9.mpasa480_mpasa480_mt232.QPC7.izumi_nag.cam-outfrq9s_mpasa480 (Overall: DIFF) details:
+ ERC_D_Ln9.ne3pg3_ne3pg3_mt232.FHISTC_LTso.izumi_nag.cam-cosp_rad_diags (Overall: DIFF) details:
+ ERC_D_Ln9.ne3pg3_ne3pg3_mt232.FHISTC_LTso.izumi_nag.cam-outfrq9s_nochem (Overall: DIFF) details:
+ SMS_D_Ln3.ne5pg3_ne5pg3_mg37.QPX2000.izumi_nag.cam-outfrq3s (Overall: DIFF) details:
+ SMS_D_Ln6.ne5_ne5_mg37.QPWmaC4.izumi_nag.cam-outfrq3s_physgrid_tem (Overall: DIFF) details:
+ SMS_D_Ln9.f10_f10_mt232.F1850.izumi_nag.cam-outfrq9s (Overall: DIFF) details:
+ - Namelist and answer differences expected for CAM7
+
+izumi/gnu/aux_cam:
+ ERC_D_Ln9.mpasa480_mpasa480_mt232.FHISTC_LTso.izumi_gnu.cam-outfrq9s_mpasa480 (Overall: DIFF) details:
+ ERC_D_Ln9.ne3pg3_ne3pg3_mt232.F1850_C4.izumi_gnu.cam-co2rmp (Overall: DIFF) details:
+ ERC_D_Ln9.ne3pg3_ne3pg3_mt232.FHISTC_LTso.izumi_gnu.cam-sat_lcltod (Overall: DIFF) details:
+ ERC_D_Ln9.ne3pg3_ne3pg3_mt232.QPC7.izumi_gnu.cam-outfrq9s (Overall: DIFF) details:
+ - Namelist and answer differences expected for CAM7
+
+ SMS_D_Ln3.ne3pg3_ne3pg3_mt232.PC7.izumi_gnu.cam-pc7_ne3pg3 (Overall: NLFAIL) details:
+ - Namelist differences expected for CAM7
+
===============================================================
Tag name: cam6_4_156
@@ -64,7 +151,7 @@ derecho/intel/aux_cam:
FAIL ERI_D_Ln18.ne16pg3_ne16pg3_mt232.FHIST_C4.derecho_intel.cam-outfrq3s_eri
- pre-existing failure
ERI bug in CICE -- See: https://github.com/ESCOMP/CESM_CICE/issues/34
-
+
DIFF ERP_D_Ln9.ne30pg3_ne30pg3_mt232.F1850C_MTso.derecho_intel.cam-outfrq9s
- expected difference due to corrections to prescribed volcanic aerosols
@@ -91,7 +178,7 @@ derecho/intel/aux_cam:
derecho/nvhpc/aux_cam: All PASS
izumi/nag/aux_cam:
- DIFF ERC_D_Ln9.ne3pg3_ne3pg3_mt232.FHISTC_LTso.izumi_nag.cam-outfrq9s_nochem
+ DIFF ERC_D_Ln9.ne3pg3_ne3pg3_mt232.FHISTC_LTso.izumi_nag.cam-outfrq9s_nochem
DIFF SMS_D_Ln6.ne5_ne5_mg37.QPWmaC4.izumi_nag.cam-outfrq3s_physgrid_tem
- differences in fill patterns of AOD diags, otherwise bit-for-bit unchanged
@@ -99,7 +186,7 @@ izumi/gnu/aux_cam:
DIFF ERC_D_Ln9.f10_f10_mg37.QPC4.izumi_gnu.cam-outfrq3s_diags
- differences in fill patterns of AOD diags and other aerosol optics now includes
BAM aerosols, otherwise bit-for-bit unchanged
-
+
DIFF ERC_D_Ln9.f10_f10_mt232.FHIST_C5.izumi_gnu.cam-rad_diag
DIFF ERC_D_Ln9.ne3pg3_ne3pg3_mt232.F1850_C4.izumi_gnu.cam-co2rmp
DIFF ERC_D_Ln9.ne3pg3_ne3pg3_mt232.FHIST.izumi_gnu.cam-nochem_clubbmf
@@ -111,7 +198,7 @@ izumi/gnu/aux_cam:
DIFF SMS_D_Ln9.f19_f19_mt232.FW4madSD.izumi_gnu.cam-outfrq9s
- default output now includes diameters all 5 modes (for history_cesm_forcing=.true.)
otherwise bit-for-bit unchanged
-
+
Summarize any changes to answers:
larger than roundoff for F1850C_MTso compset, otherwise bit-for-bit unchanged