Merge pull request #1380 from jimmielin/hplin/gw_drag

cam6_4_133: Complete CCPPization of all gravity wave drag

Author: jimmielin

.gitmodules

@@ -29,9 +29,9 @@
 [submodule "atmos_phys"]
 	path = src/atmos_phys
 	url = https://github.com/ESCOMP/atmospheric_physics
-	fxtag = atmos_phys0_18_003
+	fxtag = atmos_phys0_19_000
         fxrequired = AlwaysRequired
-	fxDONOTUSEurl = https://github.com/ESCOMP/atmospheric_physics
+        fxDONOTUSEurl = https://github.com/ESCOMP/atmospheric_physics
 
 [submodule "cam-sima"]
         path = src/utils/cam-sima

bld/build-namelist

@@ -3885,7 +3885,6 @@ if (!$simple_phys) {
     add_default($nl, 'use_gw_convect_sh', 'val'=>'.false.');
     add_default($nl, 'gw_lndscl_sgh');
     add_default($nl, 'gw_oro_south_fac');
-    add_default($nl, 'gw_limit_tau_without_eff');
     add_default($nl, 'gw_apply_tndmax');
 
     # Gravity wave ridge settings

bld/configure

@@ -2133,6 +2133,7 @@ sub write_filepath
     print $fh "$camsrcdir/src/atmos_phys/schemes/rrtmgp/utils\n";
     print $fh "$camsrcdir/src/atmos_phys/schemes/rasch_kristjansson\n";
     print $fh "$camsrcdir/src/atmos_phys/schemes/utilities\n";
+    print $fh "$camsrcdir/src/atmos_phys/schemes/gravity_wave_drag\n";
     print $fh "$camsrcdir/src/atmos_phys/schemes/rayleigh_friction\n";
     print $fh "$camsrcdir/src/atmos_phys/schemes/cloud_fraction\n";
     print $fh "$camsrcdir/src/atmos_phys/schemes/vertical_diffusion\n";

bld/namelist_files/namelist_defaults_cam.xml

@@ -298,6 +298,7 @@
 <bnd_topo hgrid="C192" >atm/cam/topo/fv3_C192_nc3000_Co030_Fi001_MulG_PF_Nsw021_c200625.nc</bnd_topo>
 <bnd_topo hgrid="C384" >atm/cam/topo/fv3_C384_nc3000_Co015_Fi001_MulG_PF_nullRR_Nsw011_c200625.nc</bnd_topo>
 
+<bnd_topo hgrid="ne3np4"          >atm/cam/topo/se/ne3np4_gmted2010_modis_bedmachine_nc0540_Laplace1000_noleak_20230717.nc</bnd_topo>
 <bnd_topo hgrid="ne5np4"          >atm/cam/topo/se/ne5np4_nc3000_Co360_Fi001_MulG_PF_nullRR_Nsw064_20170515.nc</bnd_topo>
 <bnd_topo hgrid="ne16np4"         >atm/cam/topo/se/ne16np4_nc3000_Co120_Fi001_PF_nullRR_Nsw084_20171012.nc</bnd_topo>
 <bnd_topo hgrid="ne30np4"         >atm/cam/topo/se/ne30np4_gmted2010_modis_bedmachine_nc3000_Laplace0100_noleak_greenlndantarcsgh30fac2.50_20250822.nc</bnd_topo>
@@ -793,6 +794,7 @@
 
 <gw_top_taper>.false.</gw_top_taper>
 <gw_top_taper waccmx="1">.true.</gw_top_taper>
+
 <pgwv>32</pgwv>
 <pgwv waccmx="1">18</pgwv>
 
@@ -857,16 +859,6 @@
 <gw_lndscl_sgh chem="trop_strat_mam5_vbsext">.false.</gw_lndscl_sgh>
 <gw_lndscl_sgh carma="trop_strat_soa1">.false.</gw_lndscl_sgh>
 <gw_lndscl_sgh carma="trop_strat_soa5">.false.</gw_lndscl_sgh>
-<gw_limit_tau_without_eff               >.false.</gw_limit_tau_without_eff>
-<gw_limit_tau_without_eff waccm_phys="1">.true. </gw_limit_tau_without_eff>
-<gw_limit_tau_without_eff model_top="ht">.true. </gw_limit_tau_without_eff>
-<gw_limit_tau_without_eff chem="geoschem_mam4">.true. </gw_limit_tau_without_eff>
-<gw_limit_tau_without_eff chem="trop_strat_mam4_vbs">.true. </gw_limit_tau_without_eff>
-<gw_limit_tau_without_eff chem="trop_strat_mam4_vbsext">.true. </gw_limit_tau_without_eff>
-<gw_limit_tau_without_eff chem="trop_strat_mam5_vbs">.true. </gw_limit_tau_without_eff>
-<gw_limit_tau_without_eff chem="trop_strat_mam5_vbsext">.true. </gw_limit_tau_without_eff>
-<gw_limit_tau_without_eff carma="trop_strat_soa1">.true. </gw_limit_tau_without_eff>
-<gw_limit_tau_without_eff carma="trop_strat_soa5">.true. </gw_limit_tau_without_eff>
 <gw_apply_tndmax                          >.true. </gw_apply_tndmax>
 <gw_apply_tndmax chem="geoschem_mam4"     >.false.</gw_apply_tndmax>
 <gw_apply_tndmax phys="cam7"              >.false.</gw_apply_tndmax>
@@ -2952,7 +2944,7 @@
 <scm_relax_tau_top_sec           scam="1"                  > 172800.D0  </scm_relax_tau_top_sec>
 
 
-<!-- IOP SCAM defaults (The Single Column Atmosphere Model Version 6 (SCAM6), J. Adv. Model. Earth Sy., 11, 1381–1401, https://doi.org/10.1029/2018MS001578-->
+<!-- IOP SCAM defaults (The Single Column Atmosphere Model Version 6 (SCAM6), J. Adv. Model. Earth Sy., 11, 1381-1401, https://doi.org/10.1029/2018MS001578-->
 
 <!-- IOP ARM95/ARM Southern Great Plains/lat:36/lon:263/Jul 1995/18d/M. Zhang et al. (2016)/Land convection -->
 <ncdata             hgrid="ne3np4"    nlev="32"       scam_iop="arm95"     >atm/cam/inic/se/CESM2.F2000climo.ne3np4.cam.i.0003-06-01-00000.nc</ncdata>

bld/namelist_files/namelist_definition.xml

@@ -1270,13 +1270,6 @@ In the low-top model, this helps to conserve momentum and produce a QBO.
 Default: set by build-namelist.
 </entry>
 
-<entry id="gw_limit_tau_without_eff" type="logical" category="gw_drag"
-       group="gw_drag_nl" valid_values="" >
-Apply limiters to tau before applying the efficiency factor, rather than
-afterward.
-Default: set by build-namelist
-</entry>
-
 <entry id="gw_apply_tndmax" type="logical" category="gw_drag"
        group="gw_drag_nl" valid_values="" >
 Apply limiter on maximum wind tendency from stress divergence in gravity wave drag scheme.
@@ -1533,7 +1526,7 @@ Default: set by build-namelist.
 
 <entry id="gw_rdg_do_adjust_tauoro" type="logical" category="gw_rdg"
        group="gw_rdg_nl" valid_values="" >
-If true, then adujust tauoro
+If true, then adjust tauoro
 Default: set by build-namelist.
 </entry>
 
@@ -1575,7 +1568,7 @@ Default: set by build-namelist.
 
 <entry id="gw_rdg_Fr_c" type="real"  category="gw_rdg"
        group="gw_rdg_nl" valid_values="" >
-Critical inverse4 Froude number
+Critical inverse Froude number
 Default: set by build-namelist.
 </entry>
 

doc/ChangeLog

@@ -1,5 +1,195 @@
 ===============================================================
 
+Tag name: cam6_4_133
+Originator(s): jimmielin, jtruesdal
+Date: Nov 28, 2025
+One-line Summary: Complete CCPPization of all gravity wave drag
+Github PR URL: https://github.com/ESCOMP/CAM/pull/1380
+
+Purpose of changes (include the issue number and title text for each relevant GitHub issue):
+- Completes #416:
+- Move all gravity wave parameterizations to atmos_phys.
+- Complete CCPPization of necessary interstitials.
+- Complete CCPPization of orographic gravity wave drag for CAM4.
+- Complete CCPPization of Ridge (beta/gamma), Moving Mountain, Beres convection (deep/shallow), and Frontogenesis gravity wave drag for CAM6/7.
+
+Describe any changes made to build system:
+- Add gravity wave drag scheme subdirectory to atmos_phys.
+
+Describe any changes made to the namelist:
+- Minor typo fixes; removal of certain unused parameters
+
+List any changes to the defaults for the boundary datasets:
+- Topo file for ne3np4
+
+Describe any substantial timing or memory changes: N/A
+
+Code reviewed by: nusbaume
+
+List all files eliminated:
+D       src/physics/cam/gw_common.F90
+D       src/physics/cam/gw_convect.F90
+D       src/physics/cam/gw_diffusion.F90
+D       src/physics/cam/gw_front.F90
+D       src/physics/cam/gw_movmtn.F90
+D       src/physics/cam/gw_oro.F90
+D       src/physics/cam/gw_rdg.F90
+D       src/physics/cam/gw_utils.F90
+  - moved to atmos_phys, cleaned up, CCPPized, renamed.
+
+D       src/physics/cam/vdiff_lu_solver.F90
+  - moved to atmos_phys/to_be_ccppized.
+
+D       src/physics/cam/gw_drag.F90
+  - moved to gw_drag_cam and made into a CAM interface to CCPPized subroutines.
+
+List all files added and what they do:
+A       src/physics/cam/gw_drag_cam.F90
+  - new CAM interface to CCPPized subroutines.
+
+List all existing files that have been modified, and describe the changes:
+M       .gitmodules
+M       bld/configure
+  - add new gw_drag subdir in atmos_phys.
+
+M       bld/namelist_files/namelist_defaults_cam.xml
+  - new ne3np4 topo file
+
+M       bld/namelist_files/namelist_definition.xml
+M       bld/build-namelist
+  - minor typo fixes
+  - removal of unused parameters in namelist.
+
+M       src/control/runtime_opts.F90
+M       src/physics/cam/physpkg.F90
+M       src/physics/cam7/physpkg.F90
+  - change to use gw_drag_cam CAM interfaces.
+
+M       src/utils/cam_pio_utils.F90
+  - remove trailing whitespace
+
+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:
+  ERC_D_Ln9.f09_f09_mt232.FHIST_BDRD.derecho_intel.cam-outfrq9s (Overall: NLFAIL) details:
+  ERC_D_Ln9.f19_f19_mg17.QPMOZ.derecho_intel.cam-outfrq3s (Overall: NLFAIL) details:
+  ERC_D_Ln9.f19_f19_mt232.QPC6.derecho_intel.cam-outfrq3s_cosp (Overall: NLFAIL) details:
+  ERC_D_Ln9.mpasa120_mpasa120.F2000climo.derecho_intel.cam-outfrq9s_mpasa120 (Overall: NLFAIL) details:
+  ERC_D_Ln9.mpasa120_mpasa120.FHISTC_LTso.derecho_intel.cam-outfrq9s_mpasa120 (Overall: NLFAIL) details:
+  ERC_D_Ln9.mpasa120_mpasa120.QPC7.derecho_intel.cam-outfrq9s_mpasa120 (Overall: NLFAIL) details:
+  ERC_D_Ln9.ne30pg2_ne30pg2_mt232.QPC7.derecho_intel.cam-outfrq9s (Overall: NLFAIL) details:
+  ERC_D_Ln9.ne30pg3_ne30pg3_mt232.F1850C_LTso.derecho_intel.cam-outfrq9s (Overall: NLFAIL) details:
+  ERC_Ln9.C96_C96_mt232.F2000climo.derecho_intel.cam-outfrq9s (Overall: NLFAIL) details:
+  ERI_D_Ln18.f09_f09_mt232.FHIST.derecho_intel.cam-outfrq3s_eri (Overall: NLFAIL) details:
+  ERI_D_Ln18.f19_f19_mt232.FHIST_C5.derecho_intel.cam-outfrq3s_eri (Overall: NLFAIL) details:
+  ERI_D_Ln18.ne16pg3_ne16pg3_mt232.FHIST_C4.derecho_intel.cam-outfrq3s_eri (Overall: NLFAIL) details:
+  ERI_D_Ln18.ne30pg3_ne30pg3_mt232.FHISTC_LTso.derecho_intel.cam-outfrq3s_eri (Overall: NLFAIL) details:
+  ERP_D_Ln9.ne30pg3_ne30pg3_mt232.F1850C_MTso.derecho_intel.cam-outfrq9s (Overall: NLFAIL) details:
+  ERP_D_Ln9_P64x2.f09_f09_mg17.QSC6.derecho_intel.cam-outfrq9s (Overall: NLFAIL) details:
+  ERP_Ld3.ne16pg3_ne16pg3_mg17.FHISTC_WAt1ma.derecho_intel.cam-reduced_hist1d (Overall: NLFAIL) details:
+  ERP_Ld3.ne30pg3_ne30pg3_mt232.FHISTC_MTt4s.derecho_intel.cam-outfrq1d_aoa (Overall: NLFAIL) details:
+  ERP_Lh12.f19_f19_mg17.FW4madSD.derecho_intel.cam-outfrq3h (Overall: NLFAIL) details:
+  ERP_Ln9.f09_f09_mg17.FCSD_HCO.derecho_intel.cam-outfrq9s (Overall: NLFAIL) details:
+  ERP_Ln9.f19_f19_mg17.FWsc1850.derecho_intel.cam-outfrq9s (Overall: NLFAIL) details:
+  ERP_Ln9.ne30pg3_ne30pg3_mg17.FCnudged.derecho_intel.cam-outfrq9s (Overall: NLFAIL) details:
+  ERP_Ln9.ne30pg3_ne30pg3_mg17.FHISTC_WAma.derecho_intel.cam-outfrq9s (Overall: NLFAIL) details:
+  ERR_Ln9.ne16pg3_ne16pg3_mt232.FHISTC_LTso.derecho_intel.cam-outfrq9s_bwic (Overall: NLFAIL) details:
+  ERS_Ln9.f09_f09_mg17.FX2000.derecho_intel.cam-outfrq9s (Overall: NLFAIL) details:
+  ERS_Ln9.f19_f19_mg17.FXSD.derecho_intel.cam-outfrq9s (Overall: NLFAIL) details:
+  ERS_Ln9.ne30pg3_ne30pg3_mg17.FHISTC_WXma.derecho_intel.cam-outfrq9s_ctem (Overall: NLFAIL) details:
+  SCT_D_Ln7.ne3_ne3_mg37.QPC5.derecho_intel.cam-scm_prep (Overall: NLFAIL) details:
+  SMS_C2_D_Ln9.ne16pg3_ne16pg3_mg17.FHISTC_WXma.derecho_intel.cam-outfrq9s (Overall: NLFAIL) details:
+  SMS_D_Ld5.f09_f09_mt232.PC6.derecho_intel.cam-cam6_port_f09 (Overall: NLFAIL) details:
+  SMS_D_Ld5.f19_f19_mt232.PC4.derecho_intel.cam-cam4_port5d (Overall: NLFAIL) details:
+  SMS_D_Ln9.f09_f09_mg17.FCts2nudged.derecho_intel.cam-outfrq9s_leapday (Overall: NLFAIL) details:
+  SMS_D_Ln9.f09_f09_mg17.FCvbsxHIST.derecho_intel.cam-outfrq9s (Overall: NLFAIL) details:
+  SMS_D_Ln9.f09_f09_mg17.FSD.derecho_intel.cam-outfrq9s (Overall: NLFAIL) details:
+  SMS_D_Ln9.f19_f19_mg17.FWma2000climo.derecho_intel.cam-outfrq9s (Overall: NLFAIL) details:
+  SMS_D_Ln9.f19_f19_mg17.FWma2000climo.derecho_intel.cam-outfrq9s_waccm_ma_mam4 (Overall: NLFAIL) details:
+  SMS_D_Ln9.f19_f19_mg17.QPC2000climo.derecho_intel.cam-outfrq3s_usecase (Overall: NLFAIL) details:
+  SMS_D_Ln9.f19_f19_mt232.FHIST_C5.derecho_intel.cam-mam7 (Overall: NLFAIL) details:
+  SMS_D_Ln9.ne0ARCTICne30x4_ne0ARCTICne30x4_mt12.FHIST.derecho_intel.cam-outfrq9s (Overall: NLFAIL) details:
+  SMS_D_Ln9.ne16_ne16_mg17.QPX2000.derecho_intel.cam-outfrq9s_amie (Overall: NLFAIL) details:
+  SMS_D_Ln9.ne30pg3_ne30pg3_mt232.FHISTC_MTso.derecho_intel.cam-outfrq9s (Overall: NLFAIL) details:
+  SMS_D_Ln9_P1280x1.ne30pg3_ne30pg3_mt232.FHISTC_MTt1s.derecho_intel.cam-outfrq9s_Leung_dust (Overall: NLFAIL) details:
+  SMS_Ld1.f09_f09_mg17.FCHIST_GC.derecho_intel.cam-outfrq1d (Overall: NLFAIL) details:
+  SMS_Ld1.f09_f09_mg17.FW2000climo.derecho_intel.cam-outfrq1d (Overall: NLFAIL) details:
+  SMS_Ld1.ne30pg3_ne30pg3_mg17.FC2010climo.derecho_intel.cam-outfrq1d (Overall: NLFAIL) details:
+  SMS_Lh12.f09_f09_mg17.FCSD_HCO.derecho_intel.cam-outfrq3h (Overall: NLFAIL) details:
+  SMS_Ln9.f09_f09_mg17.F2010climo.derecho_intel.cam-nudging (Overall: NLFAIL) details:
+  SMS_Ln9.f09_f09_mg17.FW1850.derecho_intel.cam-reduced_hist3s (Overall: NLFAIL) details:
+  SMS_Ln9.f19_f19_mt232.F2000climo.derecho_intel.cam-silhs (Overall: NLFAIL) details:
+  SMS_Ln9.ne30pg3_ne30pg3_mg17.FW2000climo.derecho_intel.cam-outfrq9s_rrtmgp (Overall: NLFAIL) details:
+    - removed unused namelist parameter leading to NLCOMP failure:
+      missing variable: 'gw_limit_tau_without_eff'
+
+  SMS_D_Ln9_P1536x1.ne0CONUSne30x8_ne0CONUSne30x8_mt12.FCHIST.derecho_intel.cam-outfrq9s (Overall: DIFF) details:
+    - baselines from previous tag cam6_4_132 were missing due to pre-existing failure:
+    - intermittent failure in CTSM code (lnd_set_decomp_and_domain.F90)
+
+derecho/nvhpc/aux_cam:
+  ERS_Ln9.ne30pg3_ne30pg3_mt232.FHISTC_LTso.derecho_nvhpc.cam-outfrq9s_gpu_default (Overall: FAIL) details:
+    - pre-existing failure:
+    - timing issue - Jian has determined this is due to changes on derecho with the the last upgrade.  He has
+                     reported the issue to CISL.  Note cam6_4_128 is the last CAM tag with baselines to use for comparison
+                     but answer changes are expected starting with cam6_4_130
+
+izumi/nag/aux_cam:
+  ERC_D_Ln9.f10_f10_mg37.QPWmaC6.izumi_nag.cam-outfrq3s (Overall: NLFAIL) details:
+  ERC_D_Ln9.f10_f10_mt232.FHIST_C5.izumi_nag.cam-outfrq3s_subcol (Overall: NLFAIL) details:
+  ERC_D_Ln9.f10_f10_mt232.FHIST.izumi_nag.cam-outfrq3s_cospsathist (Overall: NLFAIL) details:
+  ERC_D_Ln9.mpasa480_mpasa480_mt232.QPC7.izumi_nag.cam-outfrq9s_mpasa480 (Overall: NLFAIL) details:
+  ERC_D_Ln9.ne3pg3_ne3pg3_mt232.FHISTC_LTso.izumi_nag.cam-cosp_rad_diags (Overall: NLFAIL) details:
+  ERC_D_Ln9.ne3pg3_ne3pg3_mt232.FHISTC_LTso.izumi_nag.cam-outfrq9s_nochem (Overall: NLFAIL) details:
+  ERC_D_Ln9.ne3pg3_ne3pg3_mt232.QPC4.izumi_nag.cam-outfrq9s (Overall: NLFAIL) details:
+  SMS_D_Ld2.f45_f45_mg37.PC5.izumi_nag.cam-outfrq24h_port (Overall: NLFAIL) details:
+  SMS_D_Ln3.ne5pg3_ne5pg3_mg37.QPX2000.izumi_nag.cam-outfrq3s (Overall: NLFAIL) details:
+  SMS_D_Ln6.ne5_ne5_mg37.QPWmaC4.izumi_nag.cam-outfrq3s_physgrid_tem (Overall: NLFAIL) details:
+  SMS_D_Ln9.f10_f10_mt232.F1850.izumi_nag.cam-outfrq9s (Overall: NLFAIL) details:
+  TMC_D_Ln9.f10_f10_mt232.FHIST_C5.izumi_nag.cam-mc_ttrac (Overall: NLFAIL) details:
+    - removed unused namelist parameter leading to NLCOMP failure:
+      missing variable: 'gw_limit_tau_without_eff'
+
+izumi/gnu/aux_cam:
+  ERC_D_Ln9.C48_C48_mg17.QPC6.izumi_gnu.cam-outfrq9s (Overall: NLFAIL) details:
+  ERC_D_Ln9.f10_f10_mg37.QPC4.izumi_gnu.cam-outfrq3s_diags (Overall: NLFAIL) details:
+  ERC_D_Ln9.f10_f10_mt232.FHIST_C5.izumi_gnu.cam-rad_diag (Overall: NLFAIL) details:
+  ERC_D_Ln9.f19_f19_mt232.FHIST.izumi_gnu.cam-lonlat_fv_diags (Overall: NLFAIL) details:
+  ERC_D_Ln9.mpasa480_mpasa480_mt232.FHISTC_LTso.izumi_gnu.cam-outfrq9s_mpasa480 (Overall: NLFAIL) details:
+  ERC_D_Ln9.ne3pg3_ne3pg3_mt232.F1850_C4.izumi_gnu.cam-co2rmp (Overall: NLFAIL) details:
+  ERC_D_Ln9.ne3pg3_ne3pg3_mt232.FHIST_C5.izumi_gnu.cam-carma_cosp_rad_diag_mam (Overall: NLFAIL) details:
+  ERC_D_Ln9.ne3pg3_ne3pg3_mt232.FHISTC_LTso.izumi_gnu.cam-sat_lcltod (Overall: NLFAIL) details:
+  ERC_D_Ln9.ne3pg3_ne3pg3_mt232.FHIST.izumi_gnu.cam-nochem_clubbmf (Overall: NLFAIL) details:
+  ERC_D_Ln9.ne3pg3_ne3pg3_mt232.QPC5.izumi_gnu.cam-outfrq9s (Overall: NLFAIL) details:
+  ERC_D_Ln9.ne3pg3_ne3pg3_mt232.QPC7.izumi_gnu.cam-outfrq9s (Overall: NLFAIL) details:
+  ERC_D_Ln9.ne5_ne5_mg37.QPC4.izumi_gnu.cam-outfrq3s_nudging_ne5_L26 (Overall: NLFAIL) details:
+  ERP_Ln9_P24x2.f45_f45_mg37.QPWmaC6.izumi_gnu.cam-outfrq9s_mee_fluxes (Overall: NLFAIL) details:
+  ERS_Ln9_P24x1.mpasa480_mpasa480.F2000climo.izumi_gnu.cam-outfrq9s_mpasa480 (Overall: NLFAIL) details:
+  PLB_D_Ln9.f10_f10_mt232.FHIST_C5.izumi_gnu.cam-ttrac_loadbal0 (Overall: NLFAIL) details:
+  PLB_D_Ln9.f10_f10_mt232.FHIST_C5.izumi_gnu.cam-ttrac_loadbal1 (Overall: NLFAIL) details:
+  PLB_D_Ln9.f10_f10_mt232.FHIST_C5.izumi_gnu.cam-ttrac_loadbal3 (Overall: NLFAIL) details:
+  SCT_D_Ln7.ne3_ne3_mg37.QPC6.izumi_gnu.cam-scm_prep_c6 (Overall: NLFAIL) details:
+  SMS_D_Ln3.f10_f10_mg37.QPMOZ.izumi_gnu.cam-outfrq3s_chemproc (Overall: NLFAIL) details:
+  SMS_D_Ln3.ne3pg3_ne3pg3_mt232.PC7.izumi_gnu.cam-pc7_ne3pg3 (Overall: NLFAIL) details:
+  SMS_D_Ln9.f10_f10_mg37.QPWmaC4.izumi_gnu.cam-outfrq9s_apmee (Overall: NLFAIL) details:
+  SMS_D_Ln9.f19_f19_mt232.FW4madSD.izumi_gnu.cam-outfrq9s (Overall: NLFAIL) details:
+  SUB_D_Ln9.ne3pg3_ne3pg3_mt232.FHIST.izumi_gnu.cam-outfrq9s (Overall: NLFAIL) details:
+    - removed unused namelist parameter leading to NLCOMP failure:
+      missing variable: 'gw_limit_tau_without_eff'
+
+CAM tag used for the baseline comparison tests if different than previous
+tag: nvhpc has failed after Derecho update so using cam6_4_128 baselines.
+
+Summarize any changes to answers: All B4B
+
+If bitwise differences were observed, how did you show they were no worse
+than roundoff?
+
+===============================================================
+
 Tag name: cam6_4_132
 Originator(s): peverwhee, jimmielin, cacraigucar, nusbaume
 Date: Nov 26, 2025

src/atmos_phys

@@ -53,7 +53,7 @@ subroutine read_namelist(nlfilename, single_column, scmlat, scmlon)
    use hk_conv,             only: hkconv_readnl
    use uwshcu,              only: uwshcu_readnl
    use pkg_cld_sediment,    only: cld_sediment_readnl
-   use gw_drag,             only: gw_drag_readnl
+   use gw_drag_cam,         only: gw_drag_cam_readnl
    use qbo,                 only: qbo_readnl
    use iondrag,             only: iondrag_readnl
    use waccmx_phys_intr,    only: waccmx_phys_ion_elec_temp_readnl
@@ -157,7 +157,7 @@ subroutine read_namelist(nlfilename, single_column, scmlat, scmlon)
    call hkconv_readnl(nlfilename)
    call uwshcu_readnl(nlfilename)
    call cld_sediment_readnl(nlfilename)
-   call gw_drag_readnl(nlfilename)
+   call gw_drag_cam_readnl(nlfilename)
    call qbo_readnl(nlfilename)
    call lunar_tides_readnl(nlfilename)
    call iondrag_readnl(nlfilename)