diff --git a/bld/namelist_files/namelist_defaults_cam.xml b/bld/namelist_files/namelist_defaults_cam.xml
index b5c48835fb..bc57a5e033 100644
--- a/bld/namelist_files/namelist_defaults_cam.xml
+++ b/bld/namelist_files/namelist_defaults_cam.xml
@@ -25,6 +25,8 @@
225
450
225
+450
+225
1800
@@ -220,6 +222,8 @@
atm/cam/inic/se/ape_cam5_ne120np4_L30_c170419.nc
atm/cam/inic/se/F2000climo_ne120pg3_mt13_01-01-00000_c200420.nc
atm/cam/inic/se/ape_cam6_ne120np4_L32_c170908.nc
+atm/cam/inic/se/betacast_ERA5ml_20100101_ne120np4_L58_c260225.nc
+atm/cam/inic/se/inic/betacast_ERA5ml_20100101_ne120np4_L93_c260225.nc
atm/waccm/ic/fx2000_ne120pg3L273.001.cam.i.0002-01-01-00000.noBRCL_c250522.nc
atm/cam/inic/homme/cami_1850-01-01_ne240np4_L26_c110314.nc
@@ -234,8 +238,18 @@
atm/waccm/ic/FW2000_CONUS_30x8_L70_01-01-0001_c200602.nc
atm/cam/inic/se/FHIST_ARCTIC_ne30x4_mt12_1979bc-mg3_01-01-00000_c200424.nc
-
atm/cam/inic/se/FHIST_ARCTICGRIS_ne30x8_mt12_1979bc-mg3_01-01-00000_c200428.nc
+atm/cam/inic/se/betacast_ERA5ml_20200101_NATL_L32_c250620.nc
+atm/cam/inic/se/betacast_ERA5ml_20200101_CONUS_c250617.nc
+atm/cam/inic/se/betacast_ERA5ml_20200101_ARCTIC_c250617.nc
+atm/cam/inic/se/betacast_ERA5ml_20200101_ARCTICGRIS_c250617.nc
+atm/cam/inic/se/betacast_ERA5ml_20200101_POLARCAP_c250322.nc
+atm/cam/inic/se/betacast_ERA5ml_20200101_NATL_L58_c250618.nc
+atm/cam/inic/se/betacast_ERA5ml_20100101_CONUS_ne30x8_L93_c260225.nc
+atm/cam/inic/se/betacast_ERA5ml_20100101_ARCTIC_ne30x4_L93_c260225.nc
+atm/cam/inic/se/betacast_ERA5ml_20100101_ARCTICGRIS_ne30x8_L93_c260225.nc
+atm/cam/inic/se/betacast_ERA5ml_20100101_POLARCAP_ne30x4_L93_c260225.nc
+atm/cam/inic/se/betacast_ERA5ml_20100101_NATL_ne30x8_L93_c260225.nc
atm/cam/inic/mpas/cami_01-01-2000_00Z_mpasa480_L32_CFSR_c240508.nc
@@ -327,6 +341,8 @@
atm/cam/topo/se/ne30x8_CONUS_nc3000_Co060_Fi001_MulG_PF_RR_Nsw042_c200428.nc
atm/cam/topo/se/ne30x4_ARCTIC_nc3000_Co060_Fi001_MulG_PF_RR_Nsw042_c200428.nc
atm/cam/topo/se/ne30x8_ARCTICGRIS_nc3000_Co060_Fi001_MulG_PF_RR_Nsw042_c200428.nc
+atm/cam/topo/se/POLARCAP_gmted2010_modis_bedmachine_nc3000_Laplace0100_noleak_20250322.nc
+atm/cam/topo/se/NATL.ne30x8_gmted2010_modis_bedmachine_nc3000_Laplace0100_noleak_20260225.nc
atm/cam/topo/mpas/mpasa480_gmted2010_modis_bedmachine_nc3000_Laplace0400_noleak_20240507.nc
atm/cam/topo/mpas/mpasa120_gmted2010_modis_bedmachine_nc3000_Laplace0100_noleak_20240507.nc
@@ -361,6 +377,8 @@
atm/cam/coords/ne0np4EQFACE.ne5x4.g
atm/cam/coords/ne30x4_EXODUS_ARCTIC_c191009.g
atm/cam/coords/ne30x8_EXODUS_ARCTICGRIS_c191209.g
+atm/cam/coords/POLARCAP_ne30x4_EXODUS_c220531.nc
+atm/cam/coords/NATL_ne30x8_EXODUS_c201016.nc
none
@@ -2044,6 +2062,8 @@
atm/cam/chem/trop_mam/atmsrf_ne0np4conus30x8_161116.nc
atm/cam/chem/trop_mam/atmsrf_ne30x4_ARCTIC_191011.nc
atm/cam/chem/trop_mam/atmsrf_ne30x8_ARCTICGRIS_191212.nc
+atm/cam/chem/trop_mam/atmsrf_POLARCAP_250322.nc
+atm/cam/chem/trop_mam/atmsrf_ne0np4.NATL.ne30x8_201109.nc
atm/cam/chem/trop_mam/atmsrf_C24_c200625.nc
atm/cam/chem/trop_mam/atmsrf_C48_c200625.nc
@@ -2440,7 +2460,7 @@
1
1
3
-
+
2
1
2
@@ -3222,28 +3242,44 @@
5
2
3
- 3
+ 2
+ 2
+ 1
+ 1
+ 1
1
18
18
18
18
30
+ 2
+
+ 1
+ 3
+ 3
+ 2
+ 4
+ 20
+ 60
+ 4
+ 2
+ 2
+ 5
+ 5
+ 5
+ 4
+ 2
+ 4
+ 40
+ 180
+ 10
+ 3
+ 3
+ 6
+ 6
+ 6
- 1
- 3
- 3
- 2
- 4
- 20
- 60
- 4
- 2
- 4
- 2
- 4
- 40
- 180
1
2
@@ -3298,33 +3334,49 @@
.true.
.true.
.true.
+ .true.
+ .true.
2
1
- 3
- 3
- 2
- 3
- 3
+ 3
+ 3
+ 2
+ 3
+ 3
4
- 2
- 4
- 4
- 5
- 10
-
- 7
- 10
-
- 3
- 3
- 2
- 2
- 4
- 2
- 3
- 5
+ 2
+ 4
+ 4
+ 5
+ 3
+ 3
+ 3
+ 3
+ 3
+ 10
+ 7
+ 10
+ 8
+ 4
+ 4
+ 4
+
+ 3
+ 3
+ 2
+ 2
+ 4
+ 2
+ 3
+ 5
+ 3
+ 6
+ 6
+ 5
+ 5
+ 5
-1
-1
diff --git a/cime_config/testdefs/testlist_cam.xml b/cime_config/testdefs/testlist_cam.xml
index cffd89b30d..939f0d31f6 100644
--- a/cime_config/testdefs/testlist_cam.xml
+++ b/cime_config/testdefs/testlist_cam.xml
@@ -1512,6 +1512,7 @@
+
@@ -1545,6 +1546,24 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/doc/ChangeLog b/doc/ChangeLog
index 9b39012a4e..4f942aa1ad 100644
--- a/doc/ChangeLog
+++ b/doc/ChangeLog
@@ -1,6 +1,68 @@
===============================================================
+Tag name: cam6_4_165
+Originator(s): adamrher, cacraigucar
+Date: April 16, 2026
+One-line Summary: Implement POLARCAP and NATL grids +L58/L93 inic for all SE-VR grids
+Github PR URL: htpps://github.com/ESCOMP/CAM/pull/1287
+
+Purpose of changes (include the issue number and title text for each relevant GitHub issue):
+ - Install SE dual-polar VR grid: https://github.com/ESCOMP/CAM/issues/979
+ - Add NATLx8 grid: https://github.com/ESCOMP/CAM/issues/1330
+ - Add L58/L93 support for all VR-SE grids + ne120pg3
+
+Describe any changes made to build system: N/A
+
+Describe any changes made to the namelist:
+ - added SE-VR defaults for new inputdata files and dycore time-stepping
+List any changes to the defaults for the boundary datasets:
+ - added ncdata, bnd_topo, drydep_srf_file, se_mesh_file for new and existing grids
+Describe any substantial timing or memory changes: N/A
+
+Code reviewed by: cacraigucar, PeterHjortLauritzen
+
+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/namelist_files/namelist_defaults_cam.xml
+ - added SE-VR entries for dycore time-stepping
+ - added L58 & L93 ncdata entries for all SE-VR grids + ne120pg3
+ - added bnd_topo, drydep_srf_file, se_mesh_file for POLARCAP & NATL grids
+
+M cime_config/testdefs/testlist_cam.xml
+ - Add prebeta and cam_refined tests for new grids
+
+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:
+ SMS_D_Ln9.ne0ARCTICne30x4_ne0ARCTICne30x4_mt12.FHIST.derecho_intel.cam-outfrq9s (Overall: DIFF) details:
+ - Answers expected to change for refined grids
+
+ SMS_D_Ln9_P1536x1.ne0CONUSne30x8_ne0CONUSne30x8_mt12.FCHIST.derecho_intel.cam-outfrq9s (Overall: DIFF) details:
+ - intermittent failure in CTSM code (lnd_set_decomp_and_domain.F90)
+
+derecho/nvhpc/aux_cam: all BFB
+
+izumi/nag/aux_cam:
+ ERC_D_Ln9.f10_f10_mt232.FHIST_C5.izumi_nag.cam-outfrq3s_subcol (Overall: FAIL) details:
+ 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
+
+izumi/gnu/aux_cam: all BFB
+
+Ran cam_refined tests as well. All ran to completion except:
+SMS_D_Ln9_P1280x1.ne0POLARCAPne30x4_ne0POLARCAPne30x4_mt12.FHISTC_LTso.derecho_intel.cam-outfrq9s
+ - Same failure as the above CONUS test
+
+===============================================================
+===============================================================
+
Tag name: cam6_4_164
Originator(s): cacraigucar, billsacks, sjsprecious, nusbaume, jimmielin
Date: April 15, 2026