cam6_4_170: Updates to TEM diags

bld/build-namelist

@@ -798,6 +798,18 @@ if ($docosp) {
     add_default($nl, 'docosp', 'val'=>'.true.');
 }
 
+# TEM diags
+if ($phys =~ /cam7/) {
+  add_default($nl, 'ctem_diags_numlats');
+}
+# check for conflicting TEM diagnostics settings
+if ((defined  $nl->get_value('ctem_diags_numlats')) and (defined $nl->get_value('phys_grid_ctem_za_nlat'))) {
+  my $esmf_nlats = $nl->get_value('ctem_diags_numlats');
+  my $sphr_nlats = $nl->get_value('phys_grid_ctem_za_nlat');
+  if ($esmf_nlats>0 and $sphr_nlats>0) {
+    die "Cannot set both Spherical Harmonics and ESMF regrid methods of TEM zonal mean diagnostics.\n";
+  }
+}
 
 # Constituents
 # ============
@@ -3123,7 +3135,6 @@ else {
 # present in the namelist.
 add_default($nl, 'use_hemco');
 if ($nl->get_value('use_hemco') =~ m/$TRUE/io) {
-    add_default($nl, 'cam_physics_mesh');
     add_default($nl, 'hemco_data_root');
     add_default($nl, 'hemco_config_file');
     add_default($nl, 'hemco_diagn_file');
@@ -3211,7 +3222,6 @@ if ($waccmx) {
     add_default($nl, 'fv_high_altitude', 'val'=>'.true.');
   }
   if ($ionos ne 'none') {
-    add_default($nl, 'cam_physics_mesh');
     add_default($nl, 'oplus_grid');
     add_default($nl, 'edyn_grid');
   }

bld/namelist_files/namelist_defaults_cam.xml

@@ -959,18 +959,10 @@
 <edyn_grid hgrid="0.47x0.63">320x385</edyn_grid>
 <edyn_grid hgrid="ne120np4" >320x385</edyn_grid>
 
-<!-- ESMF mesh files for physics decomposition -->
-<cam_physics_mesh hgrid="0.47x0.63">atm/cam/coords/fv0.47x0.63_esmf_c210305.nc</cam_physics_mesh>
-<cam_physics_mesh hgrid="0.9x1.25">atm/cam/coords/fv0.9x1.25_esmf_c210305.nc</cam_physics_mesh>
-<cam_physics_mesh hgrid="1.9x2.5">atm/cam/coords/fv1.9x2.5_esmf_200428.nc</cam_physics_mesh>
-<cam_physics_mesh hgrid="4x5">atm/cam/coords/fv4x5_esmf_c210305.nc</cam_physics_mesh>
-<cam_physics_mesh hgrid="ne5np4">atm/cam/coords/ne5np4_esmf_20191204.nc</cam_physics_mesh>
-<cam_physics_mesh hgrid="ne5np4" npg="3">atm/cam/coords/ne5np4.pg3_esmf_mesh_c210121.nc</cam_physics_mesh>
-<cam_physics_mesh hgrid="ne16np4">atm/cam/coords/ne16np4_esmf_c210305.nc</cam_physics_mesh>
-<cam_physics_mesh hgrid="ne16np4" npg="3">share/meshes/ne16pg3_ESMFmesh_cdf5_c20211018.nc</cam_physics_mesh>
-<cam_physics_mesh hgrid="ne30np4">atm/cam/coords/ne30np4_esmf_c210305.nc</cam_physics_mesh>
-<cam_physics_mesh hgrid="ne30np4" npg="3">atm/cam/coords/ne30pg3_esmf_20200428.nc</cam_physics_mesh>
-<cam_physics_mesh hgrid="ne120np4" npg="3">share/meshes/ne120pg3_ESMFmesh_cdf5_c20211018.nc</cam_physics_mesh>
+<!-- For ESMF regrid zonal-mean TEM diagnostics -->
+<ctem_diags_numlats>0</ctem_diags_numlats>
+<ctem_diags_numlats hgrid="ne16np4">90</ctem_diags_numlats>
+<ctem_diags_numlats hgrid="ne30np4">180</ctem_diags_numlats>
 
 <!-- For scaling lightning sources of NOx -->
 <lght_no_prd_factor                                              >1.00D0</lght_no_prd_factor>

bld/namelist_files/use_cases/1850_trop_strat_t4s_cam7.xml

@@ -114,13 +114,6 @@
  'HCFC22', 'N2O', 'CFC114', 'CFC115', 'HCFC141B', 'HCFC142B', 'CH2BR2', 'CHBR3', 'H2402', 'OCS', 'SF6', 'CFC11eq'
 </flbc_list>
 
-<!-- TEM -- REMOVE (will be default namelist parms) -->
-<!-- cam_physics_mesh = '$ATM_DOMAIN_MESH' -->
-<cam_physics_mesh hgrid="ne16np4" npg="3">share/meshes/ne16pg3_ESMFmesh_cdf5_c20211018.nc</cam_physics_mesh>
-<cam_physics_mesh hgrid="ne30np4" npg="3">share/meshes/ne30pg3_ESMFmesh_cdf5_c20211018.nc</cam_physics_mesh>
-<ctem_diags_numlats hgrid="ne16np4"> 90</ctem_diags_numlats>
-<ctem_diags_numlats hgrid="ne30np4">180</ctem_diags_numlats>
-
 <!-- history output -->
 
 <mfilt                           >      0,       5,     20,      40,      12,      120,       73</mfilt>

cime_config/buildnml

@@ -49,6 +49,7 @@ def buildnml(case, caseroot, compname):
     COMP_INTERFACE      = case.get_value("COMP_INTERFACE")
     CALENDAR            = case.get_value("CALENDAR")
     COMPSET             = case.get_value("COMPSET")
+    mesh_file           = case.get_value("ATM_DOMAIN_MESH")
 
 # The Gregorian calendar currently can't be used with spinup compsets
 # because CAM's stream-handling code can't handle a request for data
@@ -153,6 +154,9 @@ def buildnml(case, caseroot, compname):
             if ninst > 1:
                 logger.info("%s is being used for cam_branch_file", cam_branch_file)
 
+        # ESMF mesh file
+        infile_lines.append(" cam_physics_mesh = '" + mesh_file + "'")
+
         # In python3 integer division returns a float value.
         # Adjust argument of int() to get nearest integer.
         dtime = int( (3600*24)/int(atm_ncpl) + .5)

cime_config/testdefs/testmods_dirs/cam/outfrq3s_physgrid_tem/user_nl_cam

@@ -6,3 +6,4 @@ phys_grid_ctem_nfreq=3
 phys_grid_ctem_zm_nbas=16
 phys_grid_ctem_za_nlat=15
 fincl3 = 'Uzm','Vzm','Wzm','THzm', 'VTHzm','WTHzm','UVzm','UWzm'
+ctem_diags_numlats=0

cime_config/testdefs/testmods_dirs/cam/outfrq9s_ctem/user_nl_cam

@@ -4,7 +4,6 @@ nhtfrq=9,9,9,9,9,9,9,9,9,9
 write_nstep0=.true.
 inithist='ENDOFRUN'
 
-cam_physics_mesh = '$ATM_DOMAIN_MESH'
 ctem_diags_numlats = 90
 
 fincl2 = 'THtem','Utem','Vtem','Wtem','VTHtem','WTHtem','UVtem', 'UWtem', 'MSKtem', 'PStem'

cime_config/testdefs/testmods_dirs/cam/outfrq9s_physgrid_tem_1deg/user_nl_cam

@@ -6,3 +6,4 @@ phys_grid_ctem_nfreq=-2
 phys_grid_ctem_zm_nbas=120
 phys_grid_ctem_za_nlat=90
 fincl3 = 'Uzm','Vzm','Wzm','THzm', 'VTHzm','WTHzm','UVzm','UWzm'
+ctem_diags_numlats=0

doc/ChangeLog

@@ -1,5 +1,199 @@
 ===============================================================
 
+Tag name: cam6_4_170
+Originator(s): fvitt
+Date: 30 Apr 2026
+One-line Summary: TEM diagnostics updates
+Github PR URL: https://github.com/ESCOMP/CAM/pull/1543
+
+Purpose of changes (include the issue number and title text for each relevant GitHub issue):
+
+ Issue #1542
+ Implement the following updates to TEM diagnostics:
+  - Set up default namelist settings so that ESMF regrid method is used by default
+    in cam7 configurations
+  - ESMF bilinear interpolation for the zonal mean calculations
+  - Use constant scale height of 7 km
+  - Correct calculation of potential temperature (Exner bug fix)
+  - Vertically interpolate to constant pressures before TEM terms are calculated
+
+Describe any changes made to build system: N/A
+
+Describe any changes made to the namelist: N/A
+
+List any changes to the defaults for the boundary datasets: N/A
+
+Describe any substantial timing or memory changes: N/A
+
+Code reviewed by: cacraigucar
+
+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
+ - set default TEM diags namelist settings
+ - add check for conflicting namelist settings
+ - remove add_default for cam_physics_mesh -- now set by buildnml for all configurations
+
+M       bld/namelist_files/namelist_defaults_cam.xml
+ - remove cam_physics_mesh defaults -- now set to $ATM_DOMAIN_MESH in buildnml
+ - default TEM num lats for ne16 and ne30 grids
+
+M       bld/namelist_files/use_cases/1850_trop_strat_t4s_cam7.xml
+ - remove TEM settings -- now set by default
+
+M       cime_config/buildnml
+ - set cam_physics_mesh to $ATM_DOMAIN_MESH for all configurations
+
+M       cime_config/testdefs/testmods_dirs/cam/outfrq3s_physgrid_tem/user_nl_cam
+M       cime_config/testdefs/testmods_dirs/cam/outfrq9s_physgrid_tem_1deg/user_nl_cam
+ - avoid conflicting TEM settings
+
+M       cime_config/testdefs/testmods_dirs/cam/outfrq9s_ctem/user_nl_cam
+ - remove cam_physics_mesh settings -- now default
+
+M       src/physics/cam/phys_grid_ctem.F90
+ - use constant scale height of 7 km
+ - correct calculation of potential temperature (Exner bug fix)
+
+M       src/utils/ctem_diags_mod.F90
+ - use constant scale height of 7 km
+ - correct calculation of potential temperature (Exner bug fix)
+ - vertically interpolate to constant pressures before TEM terms are calculated
+
+M       src/utils/esmf_phys2lonlat_mod.F90
+ - ESMF bilinear interpolation for the zonal mean calculations
+
+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:
+  NLFAIL ERC_D_Ln9.f09_f09_mt232.FHIST_BDRD.derecho_intel.cam-outfrq9s
+  NLFAIL ERC_D_Ln9.f19_f19_mg17.QPMOZ.derecho_intel.cam-outfrq3s
+  NLFAIL ERC_D_Ln9.f19_f19_mt232.QPC6.derecho_intel.cam-outfrq3s_cosp
+  NLFAIL ERC_D_Ln9.mpasa120_mpasa120.F2000climo.derecho_intel.cam-outfrq9s_mpasa120
+  NLFAIL ERC_D_Ln9.mpasa120_mpasa120.FHISTC_LTso.derecho_intel.cam-outfrq9s_mpasa120
+  NLFAIL ERC_D_Ln9.mpasa120_mpasa120.QPC7.derecho_intel.cam-outfrq9s_mpasa120
+  NLFAIL ERC_D_Ln9.ne30pg2_ne30pg2_mt232.QPC7.derecho_intel.cam-outfrq9s
+  NLFAIL ERC_D_Ln9.ne30pg3_ne30pg3_mt232.F1850C_LTso.derecho_intel.cam-outfrq9s
+  NLFAIL ERC_Ln9.C96_C96_mt232.F2000climo.derecho_intel.cam-outfrq9s
+  NLFAIL ERI_D_Ln18.f09_f09_mt232.FHIST.derecho_intel.cam-outfrq3s_eri
+  NLFAIL ERI_D_Ln18.f19_f19_mt232.FHIST_C5.derecho_intel.cam-outfrq3s_eri
+  NLFAIL ERI_D_Ln18.ne16pg3_ne16pg3_mt232.FHIST_C4.derecho_intel.cam-outfrq3s_eri
+  NLFAIL ERI_D_Ln18.ne30pg3_ne30pg3_mt232.FHISTC_LTso.derecho_intel.cam-outfrq3s_eri
+  NLFAIL ERP_D_Ln9.ne30pg3_ne30pg3_mt232.F1850C_MTso.derecho_intel.cam-outfrq9s
+  NLFAIL ERP_D_Ln9_P64x2.f09_f09_mg17.QSC6.derecho_intel.cam-outfrq9s
+  NLFAIL ERP_Ld3.ne16pg3_ne16pg3_mg17.FHISTC_WAt1ma.derecho_intel.cam-reduced_hist1d
+  NLFAIL ERP_Ld3.ne30pg3_ne30pg3_mt232.FHISTC_MTt4s.derecho_intel.cam-outfrq1d_aoa
+  NLFAIL ERP_Lh12.f19_f19_mg17.FW4madSD.derecho_intel.cam-outfrq3h
+  NLFAIL ERP_Ln9.f19_f19_mg17.FWsc1850.derecho_intel.cam-outfrq9s
+  NLFAIL ERP_Ln9.ne30pg3_ne30pg3_mg17.FCnudged.derecho_intel.cam-outfrq9s
+  NLFAIL ERP_Ln9.ne30pg3_ne30pg3_mg17.FHISTC_WAma.derecho_intel.cam-outfrq9s
+  NLFAIL ERR_Ln9.ne16pg3_ne16pg3_mt232.FHISTC_LTso.derecho_intel.cam-outfrq9s_bwic
+  NLFAIL SCT_D_Ln7.ne3_ne3_mg37.QPC5.derecho_intel.cam-scm_prep
+  NLFAIL SMS_C2_D_Ln9.ne16pg3_ne16pg3_mg17.FHISTC_WXma.derecho_intel.cam-outfrq9s
+  NLFAIL SMS_D_Ld5.f09_f09_mt232.PC6.derecho_intel.cam-cam6_port_f09
+  NLFAIL SMS_D_Ld5.f19_f19_mt232.PC4.derecho_intel.cam-cam4_port5d
+  NLFAIL SMS_D_Ln9.f09_f09_mg17.FCts2nudged.derecho_intel.cam-outfrq9s_leapday
+  NLFAIL SMS_D_Ln9.f09_f09_mg17.FCvbsxHIST.derecho_intel.cam-outfrq9s
+  NLFAIL SMS_D_Ln9.f09_f09_mg17.FSD.derecho_intel.cam-outfrq9s
+  NLFAIL SMS_D_Ln9.f19_f19_mg17.FCARMA2000climo.derecho_intel.cam-outfrq9s
+  NLFAIL SMS_D_Ln9.f19_f19_mg17.FCHIST_SLH.derecho_intel.cam-outfrq9s
+  NLFAIL SMS_D_Ln9.f19_f19_mg17.FWma2000climo.derecho_intel.cam-outfrq9s
+  NLFAIL SMS_D_Ln9.f19_f19_mg17.FWma2000climo.derecho_intel.cam-outfrq9s_waccm_ma_mam4
+  NLFAIL SMS_D_Ln9.f19_f19_mg17.QPC2000climo.derecho_intel.cam-outfrq3s_usecase
+  NLFAIL SMS_D_Ln9.f19_f19_mt232.FHIST_C5.derecho_intel.cam-mam7
+  NLFAIL SMS_D_Ln9.ne0ARCTICne30x4_ne0ARCTICne30x4_mt12.FHIST.derecho_intel.cam-outfrq9s
+  NLFAIL SMS_D_Ln9.ne30pg3_ne30pg3_mt232.FHISTC_MTso.derecho_intel.cam-outfrq9s
+  NLFAIL SMS_D_Ln9_P1280x1.ne30pg3_ne30pg3_mt232.FHISTC_MTt1s.derecho_intel.cam-outfrq9s_Leung_dust
+  NLFAIL SMS_D_Ln9_P1536x1.ne0CONUSne30x8_ne0CONUSne30x8_mt12.FCHIST.derecho_intel.cam-outfrq9s
+  NLFAIL SMS_Ld1.f09_f09_mg17.FW2000climo.derecho_intel.cam-outfrq1d
+  NLFAIL SMS_Ld1.ne30pg3_ne30pg3_mg17.FC2010climo.derecho_intel.cam-outfrq1d
+  NLFAIL SMS_Ln9.f09_f09_mg17.F2010climo.derecho_intel.cam-nudging
+  NLFAIL SMS_Ln9.f09_f09_mg17.FW1850.derecho_intel.cam-reduced_hist3s
+  NLFAIL SMS_Ln9.f19_f19_mt232.F2000climo.derecho_intel.cam-silhs
+  NLFAIL SMS_Ln9.ne30pg3_ne30pg3_mg17.FW2000climo.derecho_intel.cam-outfrq9s_rrtmgp
+  - cam_physics_mesh setting added to atm_in, otherwise bit-for-bit
+
+  DIFF ERP_Ln9.f09_f09_mg17.FCSD_HCO.derecho_intel.cam-outfrq9s
+  DIFF ERS_Ln9.f09_f09_mg17.FX2000.derecho_intel.cam-outfrq9s
+  DIFF ERS_Ln9.f19_f19_mg17.FXSD.derecho_intel.cam-outfrq9s
+  DIFF SMS_Ld1.f09_f09_mg17.FCHIST_GC.derecho_intel.cam-outfrq1d
+  DIFF SMS_Lh12.f09_f09_mg17.FCSD_HCO.derecho_intel.cam-outfrq3h
+  DIFF SMS_D_Ln9.ne16_ne16_mg17.QPX2000.derecho_intel.cam-outfrq9s_amie
+  - change in default cam_physics_mesh has caused differences
+
+  DIFF ERS_Ln9.ne30pg3_ne30pg3_mg17.FHISTC_WXma.derecho_intel.cam-outfrq9s_ctem
+  DIFF SMS_D_Ln9.ne30pg3_ne30pg3_mt232.1850C_CAM70%MT%CT4S2_CLM60%SP_CICE%PRES_DOCN%DOM_MOSART_SGLC_SWAV_SESP.derecho_intel.cam-outfrq9s
+  - TEM diags update -- corrections in scale height and Exner, otherwise bit-for-bit
+
+derecho/nvhpc/aux_cam:
+  NLFAIL ERS_Ln9.ne30pg3_ne30pg3_mt232.FHISTC_LTso.derecho_nvhpc.cam-outfrq9s_gpu_default
+
+izumi/nag/aux_cam:
+  FAIL ERC_D_Ln9.f10_f10_mt232.FHIST_C5.izumi_nag.cam-outfrq3s_subcol COMPARE_base_rest
+  - pre-existing failure -- see https://github.com/ESCOMP/CAM/issues/1514
+
+  NLFAIL ERC_D_Ln27.ne3pg3_ne3pg3_mt232.FKESSLER.izumi_nag.cam-outfrq9s
+  NLFAIL ERC_D_Ln9.f10_f10_mg37.QPWmaC6.izumi_nag.cam-outfrq3s
+  NLFAIL ERC_D_Ln9.f10_f10_mt232.FHIST.izumi_nag.cam-outfrq3s_cospsathist
+  NLFAIL ERC_D_Ln9.mpasa480_mpasa480_mt232.FHS94.izumi_nag.cam-outfrq9s
+  NLFAIL ERC_D_Ln9.mpasa480_mpasa480_mt232.QPC7.izumi_nag.cam-outfrq9s_mpasa480
+  NLFAIL ERC_D_Ln9.ne3pg3_ne3pg3_mt232.FHISTC_LTso.izumi_nag.cam-cosp_rad_diags
+  NLFAIL ERC_D_Ln9.ne3pg3_ne3pg3_mt232.FHISTC_LTso.izumi_nag.cam-outfrq9s_nochem
+  NLFAIL ERC_D_Ln9.ne3pg3_ne3pg3_mt232.QPC4.izumi_nag.cam-outfrq9s
+  NLFAIL ERC_D_Ln9_P1x1.ne3pg3_ne3pg3_mt232.FADIAB.izumi_nag.cam-outfrq9s
+  NLFAIL SMS_D_Ld2.f45_f45_mg37.PC5.izumi_nag.cam-outfrq24h_port
+  NLFAIL SMS_D_Ln9.f10_f10_mt232.F1850.izumi_nag.cam-outfrq9s
+  NLFAIL SMS_D_Ln9.ne3pg3_ne3pg3_mt232.QPC7.izumi_nag.cam-carma_test_tracers
+  NLFAIL TMC_D_Ln9.f10_f10_mt232.FHIST_C5.izumi_nag.cam-mc_ttrac
+  - cam_physics_mesh setting added to atm_in, otherwise bit-for-bit
+
+  DIFF SMS_D_Ln3.ne5pg3_ne5pg3_mg37.QPX2000.izumi_nag.cam-outfrq3s
+  - change in cam_physics_mesh has caused differences in WACCM-X
+    -- slight differences in physics-ionosphere mapping (regridding)
+
+  DIFF SMS_D_Ln6.ne5_ne5_mg37.QPWmaC4.izumi_nag.cam-outfrq3s_physgrid_tem
+  - TEM diags update -- corrections in scale height and Exner, otherwise bit-for-bit
+
+izumi/gnu/aux_cam:
+  NLFAIL ERC_D_Ln9.C48_C48_mg17.QPC6.izumi_gnu.cam-outfrq9s
+  NLFAIL ERC_D_Ln9.f10_f10_mg37.QPC4.izumi_gnu.cam-outfrq3s_diags
+  NLFAIL ERC_D_Ln9.f10_f10_mt232.FHIST_C5.izumi_gnu.cam-rad_diag
+  NLFAIL ERC_D_Ln9.f19_f19_mt232.FHIST.izumi_gnu.cam-lonlat_fv_diags
+  NLFAIL ERC_D_Ln9.mpasa480_mpasa480_mt232.FHISTC_LTso.izumi_gnu.cam-outfrq9s_mpasa480
+  NLFAIL ERC_D_Ln9.ne3pg3_ne3pg3_mt232.F1850_C4.izumi_gnu.cam-co2rmp
+  NLFAIL ERC_D_Ln9.ne3pg3_ne3pg3_mt232.FGRAYRAD.izumi_gnu.cam-outfrq9s
+  NLFAIL ERC_D_Ln9.ne3pg3_ne3pg3_mt232.FHIST_C5.izumi_gnu.cam-carma_cosp_rad_diag_mam
+  NLFAIL ERC_D_Ln9.ne3pg3_ne3pg3_mt232.FHISTC_LTso.izumi_gnu.cam-sat_lcltod
+  NLFAIL ERC_D_Ln9.ne3pg3_ne3pg3_mt232.FHIST.izumi_gnu.cam-nochem_clubbmf
+  NLFAIL ERC_D_Ln9.ne3pg3_ne3pg3_mt232.FTJ16.izumi_gnu.cam-outfrq9s
+  NLFAIL ERC_D_Ln9.ne3pg3_ne3pg3_mt232.QPC5.izumi_gnu.cam-outfrq9s
+  NLFAIL ERC_D_Ln9.ne3pg3_ne3pg3_mt232.QPC7.izumi_gnu.cam-outfrq9s
+  NLFAIL ERC_D_Ln9.ne5_ne5_mg37.QPC4.izumi_gnu.cam-outfrq3s_nudging_ne5_L26
+  NLFAIL ERS_Ln9_P24x1.mpasa480_mpasa480.F2000climo.izumi_gnu.cam-outfrq9s_mpasa480
+  NLFAIL PLB_D_Ln9.f10_f10_mt232.FHIST_C5.izumi_gnu.cam-ttrac_loadbal0
+  NLFAIL PLB_D_Ln9.f10_f10_mt232.FHIST_C5.izumi_gnu.cam-ttrac_loadbal1
+  NLFAIL PLB_D_Ln9.f10_f10_mt232.FHIST_C5.izumi_gnu.cam-ttrac_loadbal3
+  NLFAIL SCT_D_Ln7.ne3_ne3_mg37.QPC6.izumi_gnu.cam-scm_prep_c6
+  NLFAIL SMS_D_Ln3.f10_f10_mg37.QPMOZ.izumi_gnu.cam-outfrq3s_chemproc
+  NLFAIL SMS_D_Ln3.ne3pg3_ne3pg3_mt232.PC7.izumi_gnu.cam-pc7_ne3pg3
+  NLFAIL SMS_D_Ln9.f10_f10_mg37.FWmaHIST.izumi_gnu.cam-outfrq9s_mee_fluxes
+  NLFAIL SMS_D_Ln9.f10_f10_mg37.QPWmaC4.izumi_gnu.cam-outfrq9s_apmee
+  NLFAIL SMS_D_Ln9.f19_f19_mt232.FW4madSD.izumi_gnu.cam-outfrq9s
+  NLFAIL SUB_D_Ln9.ne3pg3_ne3pg3_mt232.FHIST.izumi_gnu.cam-outfrq9s
+  - cam_physics_mesh setting added to atm_in, otherwise bit-for-bit
+
+Summarize any changes to answers: bit-for-bit climate -- differences in TEM diags
+
+===============================================================
+===============================================================
+
 Tag name: cam6_4_169
 Originator(s): fvitt
 Date: 28 Apr 2026

src/physics/cam/phys_grid_ctem.F90

@@ -222,6 +222,8 @@ end subroutine phys_grid_ctem_init
   !-----------------------------------------------------------------------------
   !-----------------------------------------------------------------------------
   subroutine phys_grid_ctem_diags(phys_state)
+    use air_composition, only: cappav
+    use physconst, only: pref
     type(physics_state), intent(in) :: phys_state(begchunk:endchunk)
 
     character(len=*), parameter :: prefix = 'phys_grid_ctem_diags: '
@@ -260,22 +262,20 @@ subroutine phys_grid_ctem_diags(phys_state)
     real(r8) :: wza(nzalat,pver)
     real(r8) :: thza(nzalat,pver)
 
-    real(r8) :: sheight(pcols,pver) ! pressure scale height (m)
+    real(r8), parameter :: hscale = 7000._r8 ! pressure scale height (meters)
 
     if (.not.do_calc()) return
 
     do lchnk = begchunk,endchunk
 
        ncol = phys_state(lchnk)%ncol
 
-       ! scale height
-       sheight(:ncol,:) = phys_state(lchnk)%t(:ncol,:) * rgas / ( mbarv(:ncol,:,lchnk) * grav ) ! meters
-
        ! potential temperature
-       theta(:ncol,:,lchnk) = phys_state(lchnk)%t(:ncol,:) * phys_state(lchnk)%exner(:ncol,:)
+       theta(:ncol,:,lchnk) = phys_state(lchnk)%t(:ncol,:) * &
+            (pref/ phys_state(lchnk)%pmid(:ncol,:))**cappav(:ncol,:,lchnk)
 
        ! vertical velocity
-       w(:ncol,:,lchnk) = -sheight(:ncol,:) *  phys_state(lchnk)%omega(:ncol,:) / phys_state(lchnk)%pmid(:ncol,:)
+       w(:ncol,:,lchnk) = -hscale *  phys_state(lchnk)%omega(:ncol,:) / phys_state(lchnk)%pmid(:ncol,:)
 
        u(:ncol,:,lchnk) =  phys_state(lchnk)%u(:ncol,:)
        v(:ncol,:,lchnk) =  phys_state(lchnk)%v(:ncol,:)