diff --git a/component_grids_nuopc.xml b/component_grids_nuopc.xml
index 275139e4..97b3fc9e 100644
--- a/component_grids_nuopc.xml
+++ b/component_grids_nuopc.xml
@@ -250,6 +250,13 @@
     <support>Test support only</support>
   </domain>
 
+  <domain name="ne0np4.POLARCAP.ne30x4">
+    <nx>186194</nx> <ny>1</ny>
+    <mesh>$DIN_LOC_ROOT/share/meshes/POLARCAP_ne30x4_np4_ESMFmesh_cdf5_c20240222.nc</mesh>
+    <desc>ne0np4.POLARCAP.ne30x4 is a Spectral Elem 1-deg grid with a 1/4 deg refined region over the Arctic and Antarctica:</desc>
+    <support>Test support only</support>
+  </domain>
+
   <!-- CAM/MPAS meshes -->
   <domain name="mpasa480">
     <nx>2562</nx> <ny>1</ny>
diff --git a/modelgrid_aliases_mct.xml b/modelgrid_aliases_mct.xml
index 74ea6c06..890b2b86 100644
--- a/modelgrid_aliases_mct.xml
+++ b/modelgrid_aliases_mct.xml
@@ -1137,10 +1137,10 @@
     <mask>gx1v7</mask>
   </model_grid>
 
-  <model_grid alias="mpasa15-3_mpasa15-3" not_compset="_POP">
-    <grid name="atm">mpasa15-3</grid>
-    <grid name="lnd">mpasa15-3</grid>
-    <grid name="ocnice">mpasa15-3</grid>
+  <model_grid alias="mpasa15-3conus_mpasa15-3conus" not_compset="_POP">
+    <grid name="atm">mpasa15-3conus</grid>
+    <grid name="lnd">mpasa15-3conus</grid>
+    <grid name="ocnice">mpasa15-3conus</grid>
     <mask>gx1v7</mask>
   </model_grid>
 
diff --git a/modelgrid_aliases_nuopc.xml b/modelgrid_aliases_nuopc.xml
index 7bc4fae4..8a8ff706 100644
--- a/modelgrid_aliases_nuopc.xml
+++ b/modelgrid_aliases_nuopc.xml
@@ -1299,6 +1299,13 @@
     <mask>tx0.1v2</mask>
   </model_grid>
 
+  <model_grid alias="ne0POLARCAPne30x4_ne0POLARCAPne30x4_mt12" not_compset="_POP">
+    <grid name="atm">ne0np4.POLARCAP.ne30x4</grid>
+    <grid name="lnd">ne0np4.POLARCAP.ne30x4</grid>
+    <grid name="ocnice">ne0np4.POLARCAP.ne30x4</grid>
+    <mask>tx0.1v2</mask>
+  </model_grid>
+
   <!-- MPAS-A grids -->
 
   <model_grid alias="mpasa480_mpasa480" not_compset="_POP">
@@ -1350,19 +1357,11 @@
     <mask>gx1v7</mask>
   </model_grid>
 
-  <model_grid alias="mpasa15-3_mpasa15-3" not_compset="_POP">
-    <grid name="atm">mpasa15-3</grid>
-    <grid name="lnd">mpasa15-3</grid>
-    <grid name="ocnice">mpasa15-3</grid>
-    <mask>gx1v7</mask>
-  </model_grid>
-
-  <model_grid alias="mpasa15-3-conus_mpasa15-3-conus" not_compset="_POP">
-    <grid name="atm">mpasa15-3</grid>
-    <grid name="lnd">mpasa15-3</grid>
-    <grid name="ocnice">mpasa15-3</grid>
-    <mask>gx1v7</mask>
-  </model_grid>
+  <model_grid alias="mpasa15-3-conus_mpasa15-3-conus_mt13" not_compset="_POP">
+    <grid name="atm">mpasa15-3conus</grid>
+    <grid name="lnd">mpasa15-3conus</grid>
+    <grid name="ocnice">mpasa15-3conus</grid>
+    <mask>tx0.1v3</mask>
 
   <model_grid alias="mpasa7p5_mpasa7p5_mg17" not_compset="_POP">
     <grid name="atm">mpasa7p5</grid>