diff --git a/cime_config/allactive/config_pesall.xml b/cime_config/allactive/config_pesall.xml
index 7bcf72e44e62..ca034e18a7a5 100644
--- a/cime_config/allactive/config_pesall.xml
+++ b/cime_config/allactive/config_pesall.xml
@@ -1586,6 +1586,67 @@
       </pes>
     </mach>
   </grid>
+  <grid name="a%ne30np4.pg2_l%r05_oi%IcosXISC30E3r7_r%r05_.+">
+    <mach name="chrysalis">
+      <pes compset=".*EAM.+ELM.+MPASSI.+MPASO.+MOSART.+SWAV.+" pesize="S">
+        <comment> --compset WCYCL* --res ne30pg2_r05_IcosXISC30E3r7 on 20 nodes pure-MPI, ~7.25 sypd </comment>
+        <ntasks>
+          <ntasks_atm>1024</ntasks_atm>
+          <ntasks_cpl>1024</ntasks_cpl>
+          <ntasks_ocn>256</ntasks_ocn>
+          <ntasks_ice>640</ntasks_ice>
+          <ntasks_rof>384</ntasks_rof>
+          <ntasks_lnd>385</ntasks_lnd>
+        </ntasks>
+        <rootpe>
+          <rootpe_atm>0</rootpe_atm>
+          <rootpe_cpl>0</rootpe_cpl>
+          <rootpe_ocn>1024</rootpe_ocn>
+          <rootpe_ice>0</rootpe_ice>
+          <rootpe_rof>640</rootpe_rof>
+          <rootpe_lnd>640</rootpe_lnd>
+        </rootpe>
+      </pes>
+      <pes compset=".*EAM.+ELM.+MPASSI.+MPASO.+MOSART.+SWAV.+" pesize="M">
+        <comment> --compset WCYCL* --res ne30pg2_r05_IcosXISC30E3r7 on 54 nodes pure-MPI, ~17.5 sypd </comment>
+        <ntasks>
+          <ntasks_atm>2752</ntasks_atm>
+          <ntasks_cpl>2752</ntasks_cpl>
+          <ntasks_ocn>704</ntasks_ocn>
+          <ntasks_ice>2048</ntasks_ice>
+          <ntasks_rof>704</ntasks_rof>
+          <ntasks_lnd>704</ntasks_lnd>
+        </ntasks>
+        <rootpe>
+          <rootpe_atm>0</rootpe_atm>
+          <rootpe_cpl>0</rootpe_cpl>
+          <rootpe_ocn>2752</rootpe_ocn>
+          <rootpe_ice>0</rootpe_ice>
+          <rootpe_rof>2048</rootpe_rof>
+          <rootpe_lnd>2048</rootpe_lnd>
+        </rootpe>
+      </pes>
+      <pes compset=".*EAM.+ELM.+MPASSI.+MPASO.+MOSART.+SWAV.+" pesize="L">
+        <comment> --compset WCYCL* --res ne30pg2_r05_IcosXISC30E3r7 on 105 nodes pure-MPI, ~27.7 sypd </comment>
+        <ntasks>
+          <ntasks_atm>5440</ntasks_atm>
+          <ntasks_cpl>5440</ntasks_cpl>
+          <ntasks_ocn>1280</ntasks_ocn>
+          <ntasks_ice>4352</ntasks_ice>
+          <ntasks_rof>1088</ntasks_rof>
+          <ntasks_lnd>1088</ntasks_lnd>
+        </ntasks>
+        <rootpe>
+          <rootpe_atm>0</rootpe_atm>
+          <rootpe_cpl>0</rootpe_cpl>
+          <rootpe_ocn>5440</rootpe_ocn>
+          <rootpe_ice>0</rootpe_ice>
+          <rootpe_rof>4352</rootpe_rof>
+          <rootpe_lnd>4352</rootpe_lnd>
+        </rootpe>
+      </pes>
+    </mach>
+  </grid>
   <grid name="a%ne30np4.pg.+_oi%EC30to60E2r2">
     <mach name="chrysalis">
       <pes compset=".*EAM.+ELM.+MPASSI.+MPASO.+MOSART.+SWAV.+" pesize="XS">
diff --git a/cime_config/config_grids.xml b/cime_config/config_grids.xml
index 0ed744245bea..b9ae00da0195 100755
--- a/cime_config/config_grids.xml
+++ b/cime_config/config_grids.xml
@@ -599,6 +599,16 @@
       <mask>IcoswISC30E3r5</mask>
     </model_grid>
 
+    <model_grid alias="TL319_IcosXISC30E3r7" compset="(DATM|XATM|SATM)">
+      <grid name="atm">TL319</grid>
+      <grid name="lnd">TL319</grid>
+      <grid name="ocnice">IcosXISC30E3r7</grid>
+      <grid name="rof">JRA025</grid>
+      <grid name="glc">null</grid>
+      <grid name="wav">null</grid>
+      <mask>IcosXISC30E3r7</mask>
+    </model_grid>
+
     <model_grid alias="TL319_oRRS18to6v3" compset="(DATM|XATM|SATM)">
       <grid name="atm">TL319</grid>
       <grid name="lnd">TL319</grid>
@@ -2174,6 +2184,16 @@
       <mask>IcoswISC30E3r5</mask>
     </model_grid>
 
+    <model_grid alias="ne30pg2_r05_IcosXISC30E3r7">
+      <grid name="atm">ne30np4.pg2</grid>
+      <grid name="lnd">r05</grid>
+      <grid name="ocnice">IcosXISC30E3r7</grid>
+      <grid name="rof">r05</grid>
+      <grid name="glc">null</grid>
+      <grid name="wav">null</grid>
+      <mask>IcosXISC30E3r7</mask>
+    </model_grid>
+
     <model_grid alias="ne30pg2_r05_WC14to60E2r3">
       <grid name="atm">ne30np4.pg2</grid>
       <grid name="lnd">r05</grid>
@@ -2536,6 +2556,8 @@
       <file grid="ice|ocn" mask="ECwISC30to60E2r1">$DIN_LOC_ROOT/share/domains/domain.ocn.TL319_ECwISC30to60E2r1.201007.nc</file>
       <file grid="atm|lnd" mask="IcoswISC30E3r5">$DIN_LOC_ROOT/share/domains/domain.lnd.TL319_IcoswISC30E3r5.231121.nc</file>
       <file grid="ice|ocn" mask="IcoswISC30E3r5">$DIN_LOC_ROOT/share/domains/domain.ocn.TL319_IcoswISC30E3r5.231121.nc</file>
+      <file grid="atm|lnd" mask="IcosXISC30E3r7">$DIN_LOC_ROOT/share/domains/domain.lnd.TL319_IcosXISC30E3r7.240326.nc</file>
+      <file grid="ice|ocn" mask="IcosXISC30E3r7">$DIN_LOC_ROOT/share/domains/domain.ocn.TL319_IcosXISC30E3r7.240326.nc</file>
       <file grid="atm|lnd" mask="oRRS18to6v3">$DIN_LOC_ROOT/share/domains/domain.lnd.TL319_oRRS18to6v3.220124.nc</file>
       <file grid="ice|ocn" mask="oRRS18to6v3">$DIN_LOC_ROOT/share/domains/domain.ocn.TL319_oRRS18to6v3.220124.nc</file>
       <desc>TL319 is JRA lat/lon grid:</desc>
@@ -2645,6 +2667,8 @@
       <file grid="ice|ocn" mask="oRRS18to6v3">$DIN_LOC_ROOT/share/domains/domain.ocn.ne30pg2_oRRS18to6v3.211101.nc</file>
       <file grid="atm|lnd" mask="IcoswISC30E3r5">$DIN_LOC_ROOT/share/domains/domain.lnd.ne30pg2_IcoswISC30E3r5.231121.nc</file>
       <file grid="ice|ocn" mask="IcoswISC30E3r5">$DIN_LOC_ROOT/share/domains/domain.ocn.ne30pg2_IcoswISC30E3r5.231121.nc</file>
+      <file grid="atm|lnd" mask="IcosXISC30E3r7">$DIN_LOC_ROOT/share/domains/domain.lnd.ne30pg2_IcosXISC30E3r7.240326.nc</file>
+      <file grid="ice|ocn" mask="IcosXISC30E3r7">$DIN_LOC_ROOT/share/domains/domain.ocn.ne30pg2_IcosXISC30E3r7.240326.nc</file>
       <file grid="atm|lnd" mask="gx1v6">$DIN_LOC_ROOT/share/domains/domain.lnd.ne30pg2_gx1v6.190806.nc</file>
       <file grid="ice|ocn" mask="gx1v6">$DIN_LOC_ROOT/share/domains/domain.ocn.ne30pg2_gx1v6.190806.nc</file>
       <desc>ne30np4.pg2 is Spectral Elem 1-deg grid w/ 2x2 FV physics grid per element:</desc>
@@ -2947,6 +2971,13 @@
       <desc>IcoswISC30E3r5 is a MPAS ocean grid generated with the jigsaw/compass process using a dual mesh that is a subdivided icosahedron, resulting in a nearly uniform resolution of 30 km. Additionally, it has ocean in ice-shelf cavities:</desc>
     </domain>
 
+    <domain name="IcosXISC30E3r7">
+      <nx>463013</nx>
+      <ny>1</ny>
+      <file grid="ice|ocn">$DIN_LOC_ROOT/share/domains/domain.ocn.IcosXISC30E3r7.240326.nc</file>
+      <desc>IcosXISC30E3r7 is a MPAS ocean grid generated with the jigsaw/compass process using a dual mesh that is a subdivided icosahedron, resulting in a nearly uniform resolution of 30 km.:</desc>
+    </domain>
+
     <!-- ROF (river) grids-->
 
     <domain name="r2">
@@ -2979,6 +3010,8 @@
       <file grid="lnd" mask="WC14to60E2r3">$DIN_LOC_ROOT/share/domains/domain.lnd.r05_WC14to60E2r3.200929.nc</file>
       <file grid="atm" mask="IcoswISC30E3r5">$DIN_LOC_ROOT/share/domains/domain.lnd.r05_IcoswISC30E3r5.231121.nc</file>
       <file grid="lnd" mask="IcoswISC30E3r5">$DIN_LOC_ROOT/share/domains/domain.lnd.r05_IcoswISC30E3r5.231121.nc</file>
+      <file grid="atm" mask="IcosXISC30E3r7">$DIN_LOC_ROOT/share/domains/domain.lnd.r05_IcosXISC30E3r7.240326.nc</file>
+      <file grid="lnd" mask="IcosXISC30E3r7">$DIN_LOC_ROOT/share/domains/domain.lnd.r05_IcosXISC30E3r7.240326.nc</file>
       <file grid="lnd" mask="gx1v6">$DIN_LOC_ROOT/share/domains/domain.lnd.r05_gx1v6.191014.nc</file>
       <desc>r05 is 1/2 degree river routing grid:</desc>
     </domain>
@@ -3451,6 +3484,16 @@
       <map name="ATM2OCN_FMAPNAME_NONLINEAR">cpl/gridmaps/ne30pg2/map_ne30pg2_to_IcoswISC30E3r5_trfvnp2.20231121.nc</map>
     </gridmap>
 
+    <gridmap atm_grid="ne30np4.pg2" ocn_grid="IcosXISC30E3r7">
+      <map name="ATM2OCN_FMAPNAME">cpl/gridmaps/ne30pg2/map_ne30pg2_to_IcosXISC30E3r7_traave.20240326.nc</map>
+      <map name="ATM2OCN_VMAPNAME">cpl/gridmaps/ne30pg2/map_ne30pg2_to_IcosXISC30E3r7_trbilin.20240326.nc</map>
+      <map name="ATM2OCN_SMAPNAME">cpl/gridmaps/ne30pg2/map_ne30pg2_to_IcosXISC30E3r7_trbilin.20240326.nc</map>
+      <map name="OCN2ATM_FMAPNAME">cpl/gridmaps/IcosXISC30E3r7/map_IcosXISC30E3r7_to_ne30pg2_traave.20240326.nc</map>
+      <map name="OCN2ATM_SMAPNAME">cpl/gridmaps/IcosXISC30E3r7/map_IcosXISC30E3r7_to_ne30pg2_traave.20240326.nc</map>
+      <map name="ATM2ICE_FMAPNAME_NONLINEAR">cpl/gridmaps/ne30pg2/map_ne30pg2_to_IcosXISC30E3r7_trfvnp2.20240326.nc</map>
+      <map name="ATM2OCN_FMAPNAME_NONLINEAR">cpl/gridmaps/ne30pg2/map_ne30pg2_to_IcosXISC30E3r7_trfvnp2.20240326.nc</map>
+    </gridmap>
+
     <gridmap atm_grid="ne30np4.pg3" ocn_grid="oEC60to30v3">
       <map name="ATM2OCN_FMAPNAME">cpl/gridmaps/ne30pg3/map_ne30pg3_to_oEC60to30v3_mono.200331.nc</map>
       <map name="ATM2OCN_VMAPNAME">cpl/gridmaps/ne30pg3/map_ne30pg3_to_oEC60to30v3_bilin.200331.nc</map>
@@ -4322,6 +4365,14 @@
       <map name="OCN2ATM_SMAPNAME">cpl/gridmaps/IcoswISC30E3r5/map_IcoswISC30E3r5_to_TL319_traave.20231121.nc</map>
     </gridmap>
 
+    <gridmap atm_grid="TL319" ocn_grid="IcosXISC30E3r7">
+      <map name="ATM2OCN_FMAPNAME">cpl/gridmaps/TL319/map_TL319_to_IcosXISC30E3r7_traave.20240326.nc</map>
+      <map name="ATM2OCN_SMAPNAME">cpl/gridmaps/TL319/map_TL319_to_IcosXISC30E3r7_trbilin.20240326.nc</map>
+      <map name="ATM2OCN_VMAPNAME">cpl/gridmaps/TL319/map_TL319_to_IcosXISC30E3r7_esmfpatch.20240326.nc</map>
+      <map name="OCN2ATM_FMAPNAME">cpl/gridmaps/IcosXISC30E3r7/map_IcosXISC30E3r7_to_TL319_traave.20240326.nc</map>
+      <map name="OCN2ATM_SMAPNAME">cpl/gridmaps/IcosXISC30E3r7/map_IcosXISC30E3r7_to_TL319_traave.20240326.nc</map>
+    </gridmap>
+
     <gridmap atm_grid="TL319" ocn_grid="oRRS18to6v3">
       <map name="ATM2OCN_FMAPNAME">cpl/gridmaps/TL319/map_TL319_to_oRRS18to6v3_aave.220124.nc</map>
       <map name="ATM2OCN_SMAPNAME">cpl/gridmaps/TL319/map_TL319_to_oRRS18to6v3_bilin.220124.nc</map>
@@ -4698,6 +4749,10 @@
       <map name="OCN2ROF_SMAPNAME">cpl/gridmaps/IcoswISC30E3r5/map_IcoswISC30E3r5_to_r05_traave.20231121.nc</map>
     </gridmap>
 
+    <gridmap rof_grid="r05" ocn_grid="IcosXISC30E3r7">
+      <map name="OCN2ROF_SMAPNAME">cpl/gridmaps/IcosXISC30E3r7/map_IcosXISC30E3r7_to_r05_traave.20240326.nc</map>
+    </gridmap>
+
     <gridmap rof_grid="r05" ocn_grid="EC30to60E2r2">
       <map name="OCN2ROF_SMAPNAME">cpl/cpl6/map_EC30to60E2r2_to_r05_neareststod.220728.nc</map>
     </gridmap>
@@ -4884,6 +4939,11 @@
       <map name="ROF2OCN_LIQ_RMAPNAME">cpl/cpl6/map_JRA025_to_IcoswISC30E3r5_cstmnn.r150e300.20231121.nc</map>
     </gridmap>
 
+    <gridmap ocn_grid="IcosXISC30E3r7" rof_grid="JRA025">
+      <map name="ROF2OCN_ICE_RMAPNAME">cpl/cpl6/map_JRA025_to_IcosXISC30E3r7_cstmnn.r150e300.20240326.nc</map>
+      <map name="ROF2OCN_LIQ_RMAPNAME">cpl/cpl6/map_JRA025_to_IcosXISC30E3r7_cstmnn.r150e300.20240326.nc</map>
+    </gridmap>
+
     <gridmap ocn_grid="oRRS18to6v3" rof_grid="JRA025">
       <map name="ROF2OCN_ICE_RMAPNAME">cpl/cpl6/map_JRA025_to_oRRS18to6v3_smoothed.r50e100.220124.nc</map>
       <map name="ROF2OCN_LIQ_RMAPNAME">cpl/cpl6/map_JRA025_to_oRRS18to6v3_smoothed.r50e100.220124.nc</map>
@@ -4969,6 +5029,11 @@
       <map name="ROF2OCN_LIQ_RMAPNAME">cpl/cpl6/map_r05_to_IcoswISC30E3r5_cstmnn.r150e300.20231121.nc</map>
     </gridmap>
 
+    <gridmap ocn_grid="IcosXISC30E3r7" rof_grid="r05">
+      <map name="ROF2OCN_ICE_RMAPNAME">cpl/cpl6/map_r05_to_IcosXISC30E3r7_cstmnn.r150e300.20240326.nc</map>
+      <map name="ROF2OCN_LIQ_RMAPNAME">cpl/cpl6/map_r05_to_IcosXISC30E3r7_cstmnn.r150e300.20240326.nc</map>
+    </gridmap>
+
     <gridmap ocn_grid="WC14to60E2r3" rof_grid="r0125">
       <map name="ROF2OCN_ICE_RMAPNAME">cpl/cpl6/map_r0125_to_WC14to60E2r3_smoothed.r150e300.200929.nc</map>
       <map name="ROF2OCN_LIQ_RMAPNAME">cpl/cpl6/map_r0125_to_WC14to60E2r3_smoothed.r150e300.200929.nc</map>
diff --git a/components/elm/bld/namelist_files/namelist_definition.xml b/components/elm/bld/namelist_files/namelist_definition.xml
index 55abc0ef3069..61354711a376 100644
--- a/components/elm/bld/namelist_files/namelist_definition.xml
+++ b/components/elm/bld/namelist_files/namelist_definition.xml
@@ -1424,7 +1424,7 @@ Representative concentration pathway for future scenarios [radiative forcing at
 
 <entry id="mask" type="char*20" category="default_settings"
        group="default_settings"
-       valid_values="USGS,gx3v7,gx1v6,navy,test,tx0.1v2,tx1v1,T62,TL319,cruncep,oEC60to30v3,oEC60to30v3wLI,ECwISC30to60E1r2,EC30to60E2r2,WC14to60E2r3,WCAtl12to45E2r4,SOwISC12to60E2r4,ECwISC30to60E2r1,oRRS18to6,oRRS18to6v3,oRRS15to5,oARRM60to10,oARRM60to6,ARRM10to60E2r1,oQU480,oQU240,oQU240wLI,oQU120,oRRS30to10v3,oRRS30to10v3wLI,360x720cru,NLDASww3a,NLDAS,tx0.1v2,ICOS10,IcoswISC30E3r5">
+       valid_values="USGS,gx3v7,gx1v6,navy,test,tx0.1v2,tx1v1,T62,TL319,cruncep,oEC60to30v3,oEC60to30v3wLI,ECwISC30to60E1r2,EC30to60E2r2,WC14to60E2r3,WCAtl12to45E2r4,SOwISC12to60E2r4,ECwISC30to60E2r1,oRRS18to6,oRRS18to6v3,oRRS15to5,oARRM60to10,oARRM60to6,ARRM10to60E2r1,oQU480,oQU240,oQU240wLI,oQU120,oRRS30to10v3,oRRS30to10v3wLI,360x720cru,NLDASww3a,NLDAS,tx0.1v2,ICOS10,IcoswISC30E3r5,IcosXISC30E3r7">
 Land mask description
 </entry>
 
diff --git a/components/mpas-ocean/bld/namelist_files/namelist_defaults_mpaso.xml b/components/mpas-ocean/bld/namelist_files/namelist_defaults_mpaso.xml
index 6541b9a5a2be..5a3359cd2d7a 100644
--- a/components/mpas-ocean/bld/namelist_files/namelist_defaults_mpaso.xml
+++ b/components/mpas-ocean/bld/namelist_files/namelist_defaults_mpaso.xml
@@ -49,6 +49,7 @@
 <config_dt ocn_grid="SOwISC12to60E2r4">'00:10:00'</config_dt>
 <config_dt ocn_grid="ECwISC30to60E2r1">'00:30:00'</config_dt>
 <config_dt ocn_grid="IcoswISC30E3r5">'00:30:00'</config_dt>
+<config_dt ocn_grid="IcosXISC30E3r7">'00:30:00'</config_dt>
 <config_dt ocn_grid="FRISwISC08to60E3r1">'00:08:00'</config_dt>
 <config_dt ocn_grid="FRISwISC04to60E3r1">'00:04:00'</config_dt>
 <config_dt ocn_grid="FRISwISC02to60E3r1">'00:02:00'</config_dt>
@@ -77,6 +78,7 @@
 <config_hmix_scaleWithMesh ocn_grid="SOwISC12to60E2r4">.true.</config_hmix_scaleWithMesh>
 <config_hmix_scaleWithMesh ocn_grid="ECwISC30to60E2r1">.true.</config_hmix_scaleWithMesh>
 <config_hmix_scaleWithMesh ocn_grid="IcoswISC30E3r5">.true.</config_hmix_scaleWithMesh>
+<config_hmix_scaleWithMesh ocn_grid="IcosXISC30E3r7">.true.</config_hmix_scaleWithMesh>
 <config_hmix_scaleWithMesh ocn_grid="FRISwISC08to60E3r1">.true.</config_hmix_scaleWithMesh>
 <config_hmix_scaleWithMesh ocn_grid="FRISwISC04to60E3r1">.true.</config_hmix_scaleWithMesh>
 <config_hmix_scaleWithMesh ocn_grid="FRISwISC02to60E3r1">.true.</config_hmix_scaleWithMesh>
@@ -97,6 +99,7 @@
 <config_use_mom_del2 ocn_grid="SOwISC12to60E2r4">.true.</config_use_mom_del2>
 <config_use_mom_del2 ocn_grid="ECwISC30to60E2r1">.true.</config_use_mom_del2>
 <config_use_mom_del2 ocn_grid="IcoswISC30E3r5">.true.</config_use_mom_del2>
+<config_use_mom_del2 ocn_grid="IcosXISC30E3r7">.true.</config_use_mom_del2>
 <config_use_mom_del2 ocn_grid="FRISwISC08to60E3r1">.true.</config_use_mom_del2>
 <config_use_mom_del2 ocn_grid="FRISwISC04to60E3r1">.true.</config_use_mom_del2>
 <config_use_mom_del2 ocn_grid="FRISwISC02to60E3r1">.true.</config_use_mom_del2>
@@ -111,6 +114,7 @@
 <config_mom_del2 ocn_grid="SOwISC12to60E2r4">462.0</config_mom_del2>
 <config_mom_del2 ocn_grid="ECwISC30to60E2r1">1000.0</config_mom_del2>
 <config_mom_del2 ocn_grid="IcoswISC30E3r5">1000.0</config_mom_del2>
+<config_mom_del2 ocn_grid="IcosXISC30E3r7">1000.0</config_mom_del2>
 <config_mom_del2 ocn_grid="FRISwISC08to60E3r1">308.0</config_mom_del2>
 <config_mom_del2 ocn_grid="FRISwISC04to60E3r1">154.0</config_mom_del2>
 <config_mom_del2 ocn_grid="FRISwISC02to60E3r1">77.0</config_mom_del2>
@@ -140,6 +144,7 @@
 <config_mom_del4 ocn_grid="SOwISC12to60E2r4">1.18e10</config_mom_del4>
 <config_mom_del4 ocn_grid="ECwISC30to60E2r1">1.2e11</config_mom_del4>
 <config_mom_del4 ocn_grid="IcoswISC30E3r5">1.2e11</config_mom_del4>
+<config_mom_del4 ocn_grid="IcosXISC30E3r7">1.2e11</config_mom_del4>
 <config_mom_del4 ocn_grid="FRISwISC08to60E3r1">3.50e09</config_mom_del4>
 <config_mom_del4 ocn_grid="FRISwISC04to60E3r1">4.37e08</config_mom_del4>
 <config_mom_del4 ocn_grid="FRISwISC02to60E3r1">5.46e07</config_mom_del4>
@@ -175,6 +180,7 @@
 <config_Redi_horizontal_taper ocn_grid="SOwISC12to60E2r4">'RossbyRadius'</config_Redi_horizontal_taper>
 <config_Redi_horizontal_taper ocn_grid="ECwISC30to60E2r1">'RossbyRadius'</config_Redi_horizontal_taper>
 <config_Redi_horizontal_taper ocn_grid="IcoswISC30E3r5">'ramp'</config_Redi_horizontal_taper>
+<config_Redi_horizontal_taper ocn_grid="IcosXISC30E3r7">'ramp'</config_Redi_horizontal_taper>
 <config_Redi_horizontal_taper ocn_grid="FRISwISC08to60E3r1">'RossbyRadius'</config_Redi_horizontal_taper>
 <config_Redi_horizontal_taper ocn_grid="FRISwISC04to60E3r1">'RossbyRadius'</config_Redi_horizontal_taper>
 <config_Redi_horizontal_taper ocn_grid="FRISwISC02to60E3r1">'RossbyRadius'</config_Redi_horizontal_taper>
@@ -204,6 +210,7 @@
 <config_GM_closure ocn_grid="SOwISC12to60E2r4">'N2_dependent'</config_GM_closure>
 <config_GM_closure ocn_grid="ECwISC30to60E2r1">'N2_dependent'</config_GM_closure>
 <config_GM_closure ocn_grid="IcoswISC30E3r5">'constant'</config_GM_closure>
+<config_GM_closure ocn_grid="IcosXISC30E3r7">'constant'</config_GM_closure>
 <config_GM_closure ocn_grid="FRISwISC08to60E3r1">'N2_dependent'</config_GM_closure>
 <config_GM_closure ocn_grid="FRISwISC04to60E3r1">'N2_dependent'</config_GM_closure>
 <config_GM_closure ocn_grid="FRISwISC02to60E3r1">'N2_dependent'</config_GM_closure>
@@ -217,6 +224,7 @@
 <config_GM_constant_kappa ocn_forcing="datm_forced_restoring" ocn_grid="SOwISC12to60E2r4">600.0</config_GM_constant_kappa>
 <config_GM_constant_kappa ocn_forcing="datm_forced_restoring" ocn_grid="ECwISC30to60E2r1">600.0</config_GM_constant_kappa>
 <config_GM_constant_kappa ocn_forcing="datm_forced_restoring" ocn_grid="IcoswISC30E3r5">600.0</config_GM_constant_kappa>
+<config_GM_constant_kappa ocn_forcing="datm_forced_restoring" ocn_grid="IcosXISC30E3r7">600.0</config_GM_constant_kappa>
 <config_GM_constant_kappa ocn_forcing="datm_forced_restoring" ocn_grid="FRISwISC08to60E3r1">600.0</config_GM_constant_kappa>
 <config_GM_constant_kappa ocn_forcing="datm_forced_restoring" ocn_grid="FRISwISC04to60E3r1">600.0</config_GM_constant_kappa>
 <config_GM_constant_kappa ocn_forcing="datm_forced_restoring" ocn_grid="FRISwISC02to60E3r1">600.0</config_GM_constant_kappa>
@@ -229,6 +237,7 @@
 <config_GM_spatially_variable_baroclinic_mode ocn_grid="SOwISC12to60E2r4">1.0</config_GM_spatially_variable_baroclinic_mode>
 <config_GM_spatially_variable_baroclinic_mode ocn_grid="ECwISC30to60E2r1">1.0</config_GM_spatially_variable_baroclinic_mode>
 <config_GM_spatially_variable_baroclinic_mode ocn_grid="IcoswISC30E3r5">3.0</config_GM_spatially_variable_baroclinic_mode>
+<config_GM_spatially_variable_baroclinic_mode ocn_grid="IcosXISC30E3r7">3.0</config_GM_spatially_variable_baroclinic_mode>
 <config_GM_spatially_variable_baroclinic_mode ocn_grid="FRISwISC08to60E3r1">1.0</config_GM_spatially_variable_baroclinic_mode>
 <config_GM_spatially_variable_baroclinic_mode ocn_grid="FRISwISC04to60E3r1">1.0</config_GM_spatially_variable_baroclinic_mode>
 <config_GM_spatially_variable_baroclinic_mode ocn_grid="FRISwISC02to60E3r1">1.0</config_GM_spatially_variable_baroclinic_mode>
@@ -243,6 +252,7 @@
 <config_GM_horizontal_taper ocn_grid="SOwISC12to60E2r4">'RossbyRadius'</config_GM_horizontal_taper>
 <config_GM_horizontal_taper ocn_grid="ECwISC30to60E2r1">'RossbyRadius'</config_GM_horizontal_taper>
 <config_GM_horizontal_taper ocn_grid="IcoswISC30E3r5">'ramp'</config_GM_horizontal_taper>
+<config_GM_horizontal_taper ocn_grid="IcosXISC30E3r7">'ramp'</config_GM_horizontal_taper>
 <config_GM_horizontal_taper ocn_grid="FRISwISC08to60E3r1">'RossbyRadius'</config_GM_horizontal_taper>
 <config_GM_horizontal_taper ocn_grid="FRISwISC04to60E3r1">'RossbyRadius'</config_GM_horizontal_taper>
 <config_GM_horizontal_taper ocn_grid="FRISwISC02to60E3r1">'RossbyRadius'</config_GM_horizontal_taper>
@@ -383,6 +393,7 @@
 <config_land_ice_flux_mode ocn_grid="SOwISC12to60E2r4">'pressure_only'</config_land_ice_flux_mode>
 <config_land_ice_flux_mode ocn_grid="ECwISC30to60E2r1">'pressure_only'</config_land_ice_flux_mode>
 <config_land_ice_flux_mode ocn_grid="IcoswISC30E3r5">'pressure_only'</config_land_ice_flux_mode>
+<config_land_ice_flux_mode ocn_grid="IcosXISC30E3r7">'pressure_only'</config_land_ice_flux_mode>
 <config_land_ice_flux_mode ocn_grid="FRISwISC08to60E3r1">'pressure_only'</config_land_ice_flux_mode>
 <config_land_ice_flux_mode ocn_grid="FRISwISC04to60E3r1">'pressure_only'</config_land_ice_flux_mode>
 <config_land_ice_flux_mode ocn_grid="FRISwISC02to60E3r1">'pressure_only'</config_land_ice_flux_mode>
@@ -400,6 +411,7 @@
 <config_land_ice_flux_explicit_topDragCoeff ocn_grid="SOwISC12to60E2r4">4.48e-3</config_land_ice_flux_explicit_topDragCoeff>
 <config_land_ice_flux_explicit_topDragCoeff ocn_grid="ECwISC30to60E2r1">4.48e-3</config_land_ice_flux_explicit_topDragCoeff>
 <config_land_ice_flux_explicit_topDragCoeff ocn_grid="IcoswISC30E3r5">4.48e-3</config_land_ice_flux_explicit_topDragCoeff>
+<config_land_ice_flux_explicit_topDragCoeff ocn_grid="IcosXISC30E3r7">4.48e-3</config_land_ice_flux_explicit_topDragCoeff>
 <config_land_ice_flux_explicit_topDragCoeff ocn_grid="FRISwISC08to60E3r1">4.48e-3</config_land_ice_flux_explicit_topDragCoeff>
 <config_land_ice_flux_explicit_topDragCoeff ocn_grid="FRISwISC04to60E3r1">4.48e-3</config_land_ice_flux_explicit_topDragCoeff>
 <config_land_ice_flux_explicit_topDragCoeff ocn_grid="FRISwISC02to60E3r1">4.48e-3</config_land_ice_flux_explicit_topDragCoeff>
@@ -412,6 +424,7 @@
 <config_land_ice_flux_jenkins_heat_transfer_coefficient ocn_grid="SOwISC12to60E2r4">0.00295</config_land_ice_flux_jenkins_heat_transfer_coefficient>
 <config_land_ice_flux_jenkins_heat_transfer_coefficient ocn_grid="ECwISC30to60E2r1">0.00295</config_land_ice_flux_jenkins_heat_transfer_coefficient>
 <config_land_ice_flux_jenkins_heat_transfer_coefficient ocn_grid="IcoswISC30E3r5">0.00295</config_land_ice_flux_jenkins_heat_transfer_coefficient>
+<config_land_ice_flux_jenkins_heat_transfer_coefficient ocn_grid="IcosXISC30E3r7">0.00295</config_land_ice_flux_jenkins_heat_transfer_coefficient>
 <config_land_ice_flux_jenkins_heat_transfer_coefficient ocn_grid="FRISwISC08to60E3r1">0.00295</config_land_ice_flux_jenkins_heat_transfer_coefficient>
 <config_land_ice_flux_jenkins_heat_transfer_coefficient ocn_grid="FRISwISC04to60E3r1">0.00295</config_land_ice_flux_jenkins_heat_transfer_coefficient>
 <config_land_ice_flux_jenkins_heat_transfer_coefficient ocn_grid="FRISwISC02to60E3r1">0.00295</config_land_ice_flux_jenkins_heat_transfer_coefficient>
@@ -422,6 +435,7 @@
 <config_land_ice_flux_jenkins_salt_transfer_coefficient ocn_grid="SOwISC12to60E2r4">8.42e-5</config_land_ice_flux_jenkins_salt_transfer_coefficient>
 <config_land_ice_flux_jenkins_salt_transfer_coefficient ocn_grid="ECwISC30to60E2r1">8.42e-5</config_land_ice_flux_jenkins_salt_transfer_coefficient>
 <config_land_ice_flux_jenkins_salt_transfer_coefficient ocn_grid="IcoswISC30E3r5">8.42e-5</config_land_ice_flux_jenkins_salt_transfer_coefficient>
+<config_land_ice_flux_jenkins_salt_transfer_coefficient ocn_grid="IcosXISC30E3r7">8.42e-5</config_land_ice_flux_jenkins_salt_transfer_coefficient>
 <config_land_ice_flux_jenkins_salt_transfer_coefficient ocn_grid="FRISwISC08to60E3r1">8.42e-5</config_land_ice_flux_jenkins_salt_transfer_coefficient>
 <config_land_ice_flux_jenkins_salt_transfer_coefficient ocn_grid="FRISwISC04to60E3r1">8.42e-5</config_land_ice_flux_jenkins_salt_transfer_coefficient>
 <config_land_ice_flux_jenkins_salt_transfer_coefficient ocn_grid="FRISwISC02to60E3r1">8.42e-5</config_land_ice_flux_jenkins_salt_transfer_coefficient>
@@ -449,6 +463,7 @@
 <config_implicit_top_drag_coeff ocn_grid="SOwISC12to60E2r4">4.48e-3</config_implicit_top_drag_coeff>
 <config_implicit_top_drag_coeff ocn_grid="ECwISC30to60E2r1">4.48e-3</config_implicit_top_drag_coeff>
 <config_implicit_top_drag_coeff ocn_grid="IcoswISC30E3r5">4.48e-3</config_implicit_top_drag_coeff>
+<config_implicit_top_drag_coeff ocn_grid="IcosXISC30E3r7">4.48e-3</config_implicit_top_drag_coeff>
 <config_implicit_top_drag_coeff ocn_grid="FRISwISC08to60E3r1">4.48e-3</config_implicit_top_drag_coeff>
 <config_implicit_top_drag_coeff ocn_grid="FRISwISC04to60E3r1">4.48e-3</config_implicit_top_drag_coeff>
 <config_implicit_top_drag_coeff ocn_grid="FRISwISC02to60E3r1">4.48e-3</config_implicit_top_drag_coeff>
@@ -531,6 +546,7 @@
 <config_btr_dt ocn_grid="SOwISC12to60E2r4">'0000_00:00:15'</config_btr_dt>
 <config_btr_dt ocn_grid="ECwISC30to60E2r1">'0000_00:01:15'</config_btr_dt>
 <config_btr_dt ocn_grid="IcoswISC30E3r5">'0000_00:01:00'</config_btr_dt>
+<config_btr_dt ocn_grid="IcosXISC30E3r7">'0000_00:01:00'</config_btr_dt>
 <config_btr_dt ocn_grid="FRISwISC08to60E3r1">'0000_00:00:10'</config_btr_dt>
 <config_btr_dt ocn_grid="FRISwISC04to60E3r1">'0000_00:00:05'</config_btr_dt>
 <config_btr_dt ocn_grid="FRISwISC02to60E3r1">'0000_00:00:02.5'</config_btr_dt>
@@ -576,6 +592,7 @@
 <config_check_ssh_consistency ocn_grid="SOwISC12to60E2r4">.false.</config_check_ssh_consistency>
 <config_check_ssh_consistency ocn_grid="ECwISC30to60E2r1">.false.</config_check_ssh_consistency>
 <config_check_ssh_consistency ocn_grid="IcoswISC30E3r5">.false.</config_check_ssh_consistency>
+<config_check_ssh_consistency ocn_grid="IcosXISC30E3r7">.false.</config_check_ssh_consistency>
 <config_check_ssh_consistency ocn_grid="FRISwISC08to60E3r1">.false.</config_check_ssh_consistency>
 <config_check_ssh_consistency ocn_grid="FRISwISC04to60E3r1">.false.</config_check_ssh_consistency>
 <config_check_ssh_consistency ocn_grid="FRISwISC02to60E3r1">.false.</config_check_ssh_consistency>
@@ -1097,6 +1114,7 @@
 <config_AM_mocStreamfunction_enable ocn_grid="SOwISC12to60E2r4">.true.</config_AM_mocStreamfunction_enable>
 <config_AM_mocStreamfunction_enable ocn_grid="ECwISC30to60E2r1">.true.</config_AM_mocStreamfunction_enable>
 <config_AM_mocStreamfunction_enable ocn_grid="IcoswISC30E3r5">.true.</config_AM_mocStreamfunction_enable>
+<config_AM_mocStreamfunction_enable ocn_grid="IcosXISC30E3r7">.true.</config_AM_mocStreamfunction_enable>
 <config_AM_mocStreamfunction_enable ocn_grid="FRISwISC08to60E3r1">.true.</config_AM_mocStreamfunction_enable>
 <config_AM_mocStreamfunction_enable ocn_grid="FRISwISC04to60E3r1">.true.</config_AM_mocStreamfunction_enable>
 <config_AM_mocStreamfunction_enable ocn_grid="FRISwISC02to60E3r1">.true.</config_AM_mocStreamfunction_enable>
@@ -1183,6 +1201,7 @@
 <config_AM_conservationCheck_enable ocn_grid="SOwISC12to60E2r4">.true.</config_AM_conservationCheck_enable>
 <config_AM_conservationCheck_enable ocn_grid="ECwISC30to60E2r1">.true.</config_AM_conservationCheck_enable>
 <config_AM_conservationCheck_enable ocn_grid="IcoswISC30E3r5">.true.</config_AM_conservationCheck_enable>
+<config_AM_conservationCheck_enable ocn_grid="IcosXISC30E3r7">.true.</config_AM_conservationCheck_enable>
 <config_AM_conservationCheck_enable ocn_grid="FRISwISC08to60E3r1">.true.</config_AM_conservationCheck_enable>
 <config_AM_conservationCheck_enable ocn_grid="FRISwISC04to60E3r1">.true.</config_AM_conservationCheck_enable>
 <config_AM_conservationCheck_enable ocn_grid="FRISwISC02to60E3r1">.true.</config_AM_conservationCheck_enable>
@@ -1193,6 +1212,7 @@
 <config_AM_conservationCheck_compute_on_startup ocn_grid="SOwISC12to60E2r4">.true.</config_AM_conservationCheck_compute_on_startup>
 <config_AM_conservationCheck_compute_on_startup ocn_grid="ECwISC30to60E2r1">.true.</config_AM_conservationCheck_compute_on_startup>
 <config_AM_conservationCheck_compute_on_startup ocn_grid="IcoswISC30E3r5">.true.</config_AM_conservationCheck_compute_on_startup>
+<config_AM_conservationCheck_compute_on_startup ocn_grid="IcosXISC30E3r7">.true.</config_AM_conservationCheck_compute_on_startup>
 <config_AM_conservationCheck_compute_on_startup ocn_grid="FRISwISC08to60E3r1">.true.</config_AM_conservationCheck_compute_on_startup>
 <config_AM_conservationCheck_compute_on_startup ocn_grid="FRISwISC04to60E3r1">.true.</config_AM_conservationCheck_compute_on_startup>
 <config_AM_conservationCheck_compute_on_startup ocn_grid="FRISwISC02to60E3r1">.true.</config_AM_conservationCheck_compute_on_startup>
@@ -1201,6 +1221,7 @@
 <config_AM_conservationCheck_write_on_startup ocn_grid="SOwISC12to60E2r4">.true.</config_AM_conservationCheck_write_on_startup>
 <config_AM_conservationCheck_write_on_startup ocn_grid="ECwISC30to60E2r1">.true.</config_AM_conservationCheck_write_on_startup>
 <config_AM_conservationCheck_write_on_startup ocn_grid="IcoswISC30E3r5">.true.</config_AM_conservationCheck_write_on_startup>
+<config_AM_conservationCheck_write_on_startup ocn_grid="IcosXISC30E3r7">.true.</config_AM_conservationCheck_write_on_startup>
 <config_AM_conservationCheck_write_on_startup ocn_grid="FRISwISC08to60E3r1">.true.</config_AM_conservationCheck_write_on_startup>
 <config_AM_conservationCheck_write_on_startup ocn_grid="FRISwISC04to60E3r1">.true.</config_AM_conservationCheck_write_on_startup>
 <config_AM_conservationCheck_write_on_startup ocn_grid="FRISwISC02to60E3r1">.true.</config_AM_conservationCheck_write_on_startup>
diff --git a/components/mpas-ocean/cime_config/buildnml b/components/mpas-ocean/cime_config/buildnml
index 048e621fafad..7dca58023e0d 100755
--- a/components/mpas-ocean/cime_config/buildnml
+++ b/components/mpas-ocean/cime_config/buildnml
@@ -352,6 +352,17 @@ def buildnml(case, caseroot, compname):
         if ocn_ismf == 'data':
             data_ismf_file = 'prescribed_ismf_paolo2023.IcoswISC30E3r5.20240227.nc'
 
+    elif ocn_grid == 'IcosXISC30E3r7':
+        decomp_date = '20240314'
+        decomp_prefix = 'partitions/mpas-o.graph.info.'
+        restoring_file = 'sss.PHC2_monthlyClimatology.IcosXISC30E3r7.20240314.nc'
+        analysis_mask_file = 'IcosXISC30E3r7_mocBasinsAndTransects20210623.nc'
+        ic_date = '20240314'
+        ic_prefix = 'mpaso.IcosXISC30E3r7'
+        if ocn_ic_mode == 'spunup':
+            ic_date = '20240314'
+            ic_prefix = 'mpaso.IcosXISC30E3r7.rstFromPiControlSpinup-chrysalis'
+
     #--------------------------------------------------------------------
     # Set OCN_FORCING = datm_forced_restoring if restoring file is available
     #--------------------------------------------------------------------
diff --git a/components/mpas-seaice/bld/namelist_files/namelist_defaults_mpassi.xml b/components/mpas-seaice/bld/namelist_files/namelist_defaults_mpassi.xml
index a47e57981592..23f258f2a308 100644
--- a/components/mpas-seaice/bld/namelist_files/namelist_defaults_mpassi.xml
+++ b/components/mpas-seaice/bld/namelist_files/namelist_defaults_mpassi.xml
@@ -25,6 +25,7 @@
 <config_dt ice_grid="SOwISC12to60E2r4">1800.0</config_dt>
 <config_dt ice_grid="ECwISC30to60E2r1">1800.0</config_dt>
 <config_dt ice_grid="IcoswISC30E3r5">1800.0</config_dt>
+<config_dt ice_grid="IcosXISC30E3r7">1800.0</config_dt>
 <config_dt ice_grid="FRISwISC08to60E3r1">480.0</config_dt>
 <config_dt ice_grid="FRISwISC04to60E3r1">240.0</config_dt>
 <config_dt ice_grid="FRISwISC02to60E3r1">120.0</config_dt>
@@ -81,6 +82,7 @@
 <config_initial_latitude_north ice_grid="ECwISC30to60E2r1">75.0</config_initial_latitude_north>
 <!-- To do: 70.0 for WC but 75.0 for Cryo -->
 <config_initial_latitude_north ice_grid="IcoswISC30E3r5">70.0</config_initial_latitude_north>
+<config_initial_latitude_north ice_grid="IcosXISC30E3r7">70.0</config_initial_latitude_north>
 <config_initial_latitude_north ice_grid="FRISwISC08to60E3r1">85.0</config_initial_latitude_north>
 <config_initial_latitude_north ice_grid="FRISwISC04to60E3r1">85.0</config_initial_latitude_north>
 <config_initial_latitude_north ice_grid="FRISwISC02to60E3r1">85.0</config_initial_latitude_north>
@@ -95,6 +97,7 @@
 <config_initial_latitude_south ice_grid="ECwISC30to60E2r1">-75.0</config_initial_latitude_south>
 <!-- To do: -60.0 for WC but -75.0 for Cryo -->
 <config_initial_latitude_south ice_grid="IcoswISC30E3r5">-60.0</config_initial_latitude_south>
+<config_initial_latitude_south ice_grid="IcosXISC30E3r7">-60.0</config_initial_latitude_south>
 <config_initial_latitude_south ice_grid="FRISwISC08to60E3r1">-85.0</config_initial_latitude_south>
 <config_initial_latitude_south ice_grid="FRISwISC04to60E3r1">-85.0</config_initial_latitude_south>
 <config_initial_latitude_south ice_grid="FRISwISC02to60E3r1">-85.0</config_initial_latitude_south>
@@ -160,6 +163,7 @@
 <config_dynamics_subcycle_number ice_grid="SOwISC12to60E2r4">1</config_dynamics_subcycle_number>
 <config_dynamics_subcycle_number ice_grid="ECwISC30to60E2r1">1</config_dynamics_subcycle_number>
 <config_dynamics_subcycle_number ice_grid="IcoswISC30E3r5">1</config_dynamics_subcycle_number>
+<config_dynamics_subcycle_number ice_grid="IcosXISC30E3r7">1</config_dynamics_subcycle_number>
 <config_dynamics_subcycle_number ice_grid="FRISwISC08to60E3r1">1</config_dynamics_subcycle_number>
 <config_dynamics_subcycle_number ice_grid="FRISwISC04to60E3r1">1</config_dynamics_subcycle_number>
 <config_dynamics_subcycle_number ice_grid="FRISwISC02to60E3r1">1</config_dynamics_subcycle_number>
diff --git a/components/mpas-seaice/cime_config/buildnml b/components/mpas-seaice/cime_config/buildnml
index 0aa12105bf9a..feecb0c6987b 100755
--- a/components/mpas-seaice/cime_config/buildnml
+++ b/components/mpas-seaice/cime_config/buildnml
@@ -307,6 +307,16 @@ def buildnml(case, caseroot, compname):
                 grid_date = '20231121'
                 grid_prefix = 'mpassi.IcoswISC30E3r5.rstFromG-chrysalis'
 
+    elif ice_grid == 'IcosXISC30E3r7':
+        grid_date = '20240314'
+        grid_prefix = 'mpassi.IcosXISC30E3r7'
+        decomp_date = '20240314'
+        decomp_prefix = 'partitions/mpas-seaice.graph.info.'
+        data_iceberg_file = 'Iceberg_Climatology_Merino.IcosXISC30E3r7.20240314.nc'
+        if ice_ic_mode == 'spunup':
+            grid_date = '20240314'
+            grid_prefix = 'mpassi.IcosXISC30E3r7.rstFromPiControlSpinup-chrysalis'
+
     elif ice_grid == 'ICOS10':
         grid_date = '211015'
         grid_prefix = 'seaice.ICOS10'