diff --git a/cime_config/allactive/config_pesall.xml b/cime_config/allactive/config_pesall.xml
index 3392ad71ca10..53e1dd2e3376 100644
--- a/cime_config/allactive/config_pesall.xml
+++ b/cime_config/allactive/config_pesall.xml
@@ -843,6 +843,29 @@
       </pes>
     </mach>
   </grid>
+  <grid name="a%ne30np4.pg2_l%.+_oi%SOwISC12to30E3r3">
+    <mach name="chrysalis">
+      <pes compset=".*EAM.+ELM.+MPASSI.+MPASO.+MOSART.+SWAV.+" pesize="M">
+        <comment> -compset WCYCL*/CRYO* -res SOwISC12to30E3r3* on 52 nodes pure-MPI, ~8.5 sypd </comment>
+        <ntasks>
+          <ntasks_atm>1350</ntasks_atm>
+          <ntasks_lnd>128</ntasks_lnd>
+          <ntasks_rof>128</ntasks_rof>
+          <ntasks_ice>1280</ntasks_ice>
+          <ntasks_ocn>1920</ntasks_ocn>
+          <ntasks_cpl>1408</ntasks_cpl>
+        </ntasks>
+        <rootpe>
+          <rootpe_atm>0</rootpe_atm>
+          <rootpe_lnd>1280</rootpe_lnd>
+          <rootpe_rof>1280</rootpe_rof>
+          <rootpe_ice>0</rootpe_ice>
+          <rootpe_ocn>1408</rootpe_ocn>
+          <rootpe_cpl>0</rootpe_cpl>
+        </rootpe>
+      </pes>
+    </mach>
+  </grid>
   <grid name="a%ne30np4.pg2_l%.+_oi%ECwISC30to60E2r1">
     <mach name="anvil">
       <pes compset=".*EAM.+ELM.+MPASSI.+MPASO.+MOSART.+SGLC.+SWAV.+" pesize="M">
diff --git a/cime_config/config_grids.xml b/cime_config/config_grids.xml
index 0f1c3512ec8a..b92fe082d7ea 100755
--- a/cime_config/config_grids.xml
+++ b/cime_config/config_grids.xml
@@ -416,6 +416,16 @@
       <mask>RRSwISC6to18E3r5</mask>
     </model_grid>
 
+    <model_grid alias="T62_SOwISC12to30E3r3" compset="(DATM|XATM|SATM)">
+      <grid name="atm">T62</grid>
+      <grid name="lnd">T62</grid>
+      <grid name="ocnice">SOwISC12to30E3r3</grid>
+      <grid name="rof">rx1</grid>
+      <grid name="glc">null</grid>
+      <grid name="wav">null</grid>
+      <mask>SOwISC12to30E3r3</mask>
+    </model_grid>
+
     <model_grid alias="TL319_oQU240wLI" compset="(DATM|XATM|SATM)">
       <grid name="atm">TL319</grid>
       <grid name="lnd">TL319</grid>
@@ -656,6 +666,16 @@
       <mask>RRSwISC6to18E3r5</mask>
     </model_grid>
 
+    <model_grid alias="TL319_SOwISC12to30E3r3" compset="(DATM|XATM|SATM)">
+      <grid name="atm">TL319</grid>
+      <grid name="lnd">TL319</grid>
+      <grid name="ocnice">SOwISC12to30E3r3</grid>
+      <grid name="rof">JRA025</grid>
+      <grid name="glc">null</grid>
+      <grid name="wav">null</grid>
+      <mask>SOwISC12to30E3r3</mask>
+    </model_grid>
+
     <model_grid alias="TL319_oRRS18to6v3" compset="(DATM|XATM|SATM)">
       <grid name="atm">TL319</grid>
       <grid name="lnd">TL319</grid>
@@ -1390,6 +1410,16 @@
       <mask>RRSwISC6to18E3r5</mask>
     </model_grid>
 
+    <model_grid alias="ne30pg2_SOwISC12to30E3r3">
+      <grid name="atm">ne30np4.pg2</grid>
+      <grid name="lnd">ne30np4.pg2</grid>
+      <grid name="ocnice">SOwISC12to30E3r3</grid>
+      <grid name="rof">r05</grid>
+      <grid name="glc">null</grid>
+      <grid name="wav">null</grid>
+      <mask>SOwISC12to30E3r3</mask>
+    </model_grid>
+
     <model_grid alias="northamericax4v1_r0125_northamericax4v1" compset="(DOCN|XOCN|SOCN|AQP1)">
       <grid name="atm">ne0np4_northamericax4v1</grid>
       <grid name="lnd">r0125</grid>
@@ -2427,6 +2457,16 @@
       <mask>RRSwISC6to18E3r5</mask>
     </model_grid>
 
+    <model_grid alias="ne30pg2_r05_SOwISC12to30E3r3">
+      <grid name="atm">ne30np4.pg2</grid>
+      <grid name="lnd">r05</grid>
+      <grid name="ocnice">SOwISC12to30E3r3</grid>
+      <grid name="rof">r05</grid>
+      <grid name="glc">null</grid>
+      <grid name="wav">null</grid>
+      <mask>SOwISC12to30E3r3</mask>
+    </model_grid>
+
     <model_grid alias="ne30pg2_r05_WC14to60E2r3">
       <grid name="atm">ne30np4.pg2</grid>
       <grid name="lnd">r05</grid>
@@ -2738,6 +2778,7 @@
       <file grid="atm|lnd" mask="ECwISC30to60E2r1">$DIN_LOC_ROOT/share/domains/domain.lnd.T62_ECwISC30to60E2r1.201007.nc</file>
       <file grid="atm|lnd" mask="IcoswISC30E3r5">$DIN_LOC_ROOT/share/domains/domain.lnd.T62_IcoswISC30E3r5.231121.nc</file>
       <file grid="atm|lnd" mask="RRSwISC6to18E3r5">$DIN_LOC_ROOT/share/domains/domain.lnd.T62_RRSwISC6to18E3r5.240328.nc</file>
+      <file grid="atm|lnd" mask="SOwISC12to30E3r3">$DIN_LOC_ROOT/share/domains/domain.lnd.T62_SOwISC12to30E3r3.240808.nc</file>
       <desc>T62 is Gaussian grid:</desc>
     </domain>
 
@@ -2796,6 +2837,8 @@
       <file grid="ice|ocn" mask="IcosXISC30E3r7">$DIN_LOC_ROOT/share/domains/domain.ocn.TL319_IcosXISC30E3r7.240326.nc</file>
       <file grid="atm|lnd" mask="RRSwISC6to18E3r5">$DIN_LOC_ROOT/share/domains/domain.lnd.TL319_RRSwISC6to18E3r5.240328.nc</file>
       <file grid="ice|ocn" mask="RRSwISC6to18E3r5">$DIN_LOC_ROOT/share/domains/domain.ocn.TL319_RRSwISC6to18E3r5.240328.nc</file>
+      <file grid="atm|lnd" mask="SOwISC12to30E3r3">$DIN_LOC_ROOT/share/domains/domain.lnd.TL319_SOwISC12to30E3r3.240808.nc</file>
+      <file grid="ice|ocn" mask="SOwISC12to30E3r3">$DIN_LOC_ROOT/share/domains/domain.ocn.TL319_SOwISC12to30E3r3.240808.nc</file>
       <file grid="atm|lnd" mask="oRRS18to6v3">$DIN_LOC_ROOT/share/domains/domain.lnd.TL319_oRRS18to6v3.220124.nc</file>
       <file grid="ice|ocn" mask="oRRS18to6v3">$DIN_LOC_ROOT/share/domains/domain.ocn.TL319_oRRS18to6v3.220124.nc</file>
       <desc>TL319 is JRA lat/lon grid:</desc>
@@ -2909,6 +2952,8 @@
       <file grid="ice|ocn" mask="IcosXISC30E3r7">$DIN_LOC_ROOT/share/domains/domain.ocn.ne30pg2_IcosXISC30E3r7.240326.nc</file>
       <file grid="atm|lnd" mask="RRSwISC6to18E3r5">$DIN_LOC_ROOT/share/domains/domain.lnd.ne30pg2_RRSwISC6to18E3r5.240328.nc</file>
       <file grid="ice|ocn" mask="RRSwISC6to18E3r5">$DIN_LOC_ROOT/share/domains/domain.ocn.ne30pg2_RRSwISC6to18E3r5.240328.nc</file>
+      <file grid="atm|lnd" mask="SOwISC12to30E3r3">$DIN_LOC_ROOT/share/domains/domain.lnd.ne30pg2_SOwISC12to30E3r3.240808.nc</file>
+      <file grid="ice|ocn" mask="SOwISC12to30E3r3">$DIN_LOC_ROOT/share/domains/domain.ocn.ne30pg2_SOwISC12to30E3r3.240808.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>
@@ -3227,6 +3272,13 @@
       <desc>RRSwISC6to18E3r5 is a MPAS ocean grid generated with the jigsaw/compass process using a mesh density function that is roughly proportional to the Rossby radius of deformation, with 18 km gridcells at low and 6 km gridcells at high latitudes. Additionally, it has ocean in ice-shelf cavities:</desc>
     </domain>
 
+    <domain name="SOwISC12to30E3r3">
+      <nx>807630</nx>
+      <ny>1</ny>
+      <file grid="ice|ocn">$DIN_LOC_ROOT/share/domains/domain.ocn.SOwISC12to30E3r3.240808.nc</file>
+      <desc>SOwISC12to30E3r3 is a MPAS ocean grid generated with the jigsaw/compass process using XXXXX. Additionally, it has ocean in ice-shelf cavities:</desc>
+    </domain>
+
     <!-- ROF (river) grids-->
 
     <domain name="r2">
@@ -3263,6 +3315,8 @@
       <file grid="lnd" mask="IcosXISC30E3r7">$DIN_LOC_ROOT/share/domains/domain.lnd.r05_IcosXISC30E3r7.240326.nc</file>
       <file grid="atm" mask="RRSwISC6to18E3r5">$DIN_LOC_ROOT/share/domains/domain.lnd.r05_RRSwISC6to18E3r5.240328.nc</file>
       <file grid="lnd" mask="RRSwISC6to18E3r5">$DIN_LOC_ROOT/share/domains/domain.lnd.r05_RRSwISC6to18E3r5.240328.nc</file>
+      <file grid="atm" mask="SOwISC12to30E3r3">$DIN_LOC_ROOT/share/domains/domain.lnd.r05_SOwISC12to30E3r3.240808.nc</file>
+      <file grid="lnd" mask="SOwISC12to30E3r3">$DIN_LOC_ROOT/share/domains/domain.lnd.r05_SOwISC12to30E3r3.240808.nc</file>
       <file grid="lnd" mask="gx1v6">$DIN_LOC_ROOT/share/domains/domain.lnd.r05_gx1v6.191014.nc</file>
       <desc>r05 is 1/2 degree river routing grid:</desc>
     </domain>
@@ -3777,6 +3831,16 @@
       <map name="ATM2OCN_FMAPNAME_NONLINEAR">cpl/gridmaps/ne30pg2/map_ne30pg2_to_RRSwISC6to18E3r5_trfvnp2.20240328.nc</map>
     </gridmap>
 
+    <gridmap atm_grid="ne30np4.pg2" ocn_grid="SOwISC12to30E3r3">
+      <map name="ATM2OCN_FMAPNAME">cpl/gridmaps/ne30pg2/map_ne30pg2_to_SOwISC12to30E3r3_traave.20240808.nc</map>
+      <map name="ATM2OCN_VMAPNAME">cpl/gridmaps/ne30pg2/map_ne30pg2_to_SOwISC12to30E3r3_trbilin.20240808.nc</map>
+      <map name="ATM2OCN_SMAPNAME">cpl/gridmaps/ne30pg2/map_ne30pg2_to_SOwISC12to30E3r3-nomask_trbilin.20240808.nc</map>
+      <map name="OCN2ATM_FMAPNAME">cpl/gridmaps/SOwISC12to30E3r3/map_SOwISC12to30E3r3_to_ne30pg2_traave.20240808.nc</map>
+      <map name="OCN2ATM_SMAPNAME">cpl/gridmaps/SOwISC12to30E3r3/map_SOwISC12to30E3r3_to_ne30pg2_traave.20240808.nc</map>
+      <map name="ATM2ICE_FMAPNAME_NONLINEAR">cpl/gridmaps/ne30pg2/map_ne30pg2_to_SOwISC12to30E3r3_trfvnp2.20240808.nc</map>
+      <map name="ATM2OCN_FMAPNAME_NONLINEAR">cpl/gridmaps/ne30pg2/map_ne30pg2_to_SOwISC12to30E3r3_trfvnp2.20240808.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>
@@ -4565,6 +4629,14 @@
       <map name="OCN2ATM_SMAPNAME">cpl/gridmaps/RRSwISC6to18E3r5/map_RRSwISC6to18E3r5_to_T62_traave.20240328.nc</map>
     </gridmap>
 
+    <gridmap atm_grid="T62" ocn_grid="SOwISC12to30E3r3">
+      <map name="ATM2OCN_FMAPNAME">cpl/gridmaps/T62/map_T62_to_SOwISC12to30E3r3_traave.20240808.nc</map>
+      <map name="ATM2OCN_SMAPNAME">cpl/gridmaps/T62/map_T62_to_SOwISC12to30E3r3-nomask_trbilin.20240808.nc</map>
+      <map name="ATM2OCN_VMAPNAME">cpl/gridmaps/T62/map_T62_to_SOwISC12to30E3r3_esmfpatch.20240808.nc</map>
+      <map name="OCN2ATM_FMAPNAME">cpl/gridmaps/SOwISC12to30E3r3/map_SOwISC12to30E3r3_to_T62_traave.20240808.nc</map>
+      <map name="OCN2ATM_SMAPNAME">cpl/gridmaps/SOwISC12to30E3r3/map_SOwISC12to30E3r3_to_T62_traave.20240808.nc</map>
+    </gridmap>
+
     <gridmap atm_grid="TL319" ocn_grid="oQU240wLI">
       <map name="ATM2OCN_FMAPNAME">cpl/gridmaps/TL319/map_TL319_to_oQU240wLI_traave.20240509.nc</map>
       <map name="ATM2OCN_SMAPNAME">cpl/gridmaps/TL319/map_TL319_to_oQU240wLI-nomask_trbilin.20240509.nc</map>
@@ -4717,6 +4789,14 @@
       <map name="OCN2ATM_SMAPNAME">cpl/gridmaps/RRSwISC6to18E3r5/map_RRSwISC6to18E3r5_to_TL319_traave.20240328.nc</map>
     </gridmap>
 
+    <gridmap atm_grid="TL319" ocn_grid="SOwISC12to30E3r3">
+      <map name="ATM2OCN_FMAPNAME">cpl/gridmaps/TL319/map_TL319_to_SOwISC12to30E3r3_traave.20240808.nc</map>
+      <map name="ATM2OCN_SMAPNAME">cpl/gridmaps/TL319/map_TL319_to_SOwISC12to30E3r3-nomask_trbilin.20240808.nc</map>
+      <map name="ATM2OCN_VMAPNAME">cpl/gridmaps/TL319/map_TL319_to_SOwISC12to30E3r3_esmfpatch.20240808.nc</map>
+      <map name="OCN2ATM_FMAPNAME">cpl/gridmaps/SOwISC12to30E3r3/map_SOwISC12to30E3r3_to_TL319_traave.20240808.nc</map>
+      <map name="OCN2ATM_SMAPNAME">cpl/gridmaps/SOwISC12to30E3r3/map_SOwISC12to30E3r3_to_TL319_traave.20240808.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>
@@ -5101,6 +5181,10 @@
       <map name="OCN2ROF_SMAPNAME">cpl/gridmaps/RRSwISC6to18E3r5/map_RRSwISC6to18E3r5_to_r05_traave.20240328.nc</map>
     </gridmap>
 
+    <gridmap rof_grid="r05" ocn_grid="SOwISC12to30E3r3">
+      <map name="OCN2ROF_SMAPNAME">cpl/gridmaps/SOwISC12to30E3r3/map_SOwISC12to30E3r3_to_r05_traave.20240808.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>
@@ -5216,6 +5300,11 @@
       <map name="ROF2OCN_LIQ_RMAPNAME">cpl/cpl6/map_rx1_to_RRSwISC6to18E3r5_cstmnn.r50e100.20240328.nc</map>
     </gridmap>
 
+    <gridmap ocn_grid="SOwISC12to30E3r3" rof_grid="rx1">
+      <map name="ROF2OCN_ICE_RMAPNAME">cpl/cpl6/map_rx1_to_SOwISC12to30E3r3_cstmnn.r150e300.20240808.nc</map>
+      <map name="ROF2OCN_LIQ_RMAPNAME">cpl/cpl6/map_rx1_to_SOwISC12to30E3r3_cstmnn.r150e300.20240808.nc</map>
+    </gridmap>
+
     <gridmap ocn_grid="oQU240wLI" rof_grid="JRA025">
       <map name="ROF2OCN_ICE_RMAPNAME">cpl/cpl6/map_JRA025_to_oQU240wLI_cstmnn.r150e300.20240516.nc</map>
       <map name="ROF2OCN_LIQ_RMAPNAME">cpl/cpl6/map_JRA025_to_oQU240wLI_cstmnn.r150e300.20240516.nc</map>
@@ -5311,6 +5400,11 @@
       <map name="ROF2OCN_LIQ_RMAPNAME">cpl/cpl6/map_JRA025_to_RRSwISC6to18E3r5_cstmnn.r50e100.20240328.nc</map>
     </gridmap>
 
+    <gridmap ocn_grid="SOwISC12to30E3r3" rof_grid="JRA025">
+      <map name="ROF2OCN_ICE_RMAPNAME">cpl/cpl6/map_JRA025_to_SOwISC12to30E3r3_cstmnn.r150e300.20240808.nc</map>
+      <map name="ROF2OCN_LIQ_RMAPNAME">cpl/cpl6/map_JRA025_to_SOwISC12to30E3r3_cstmnn.r150e300.20240808.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>
@@ -5402,10 +5496,15 @@
     </gridmap>
 
     <gridmap ocn_grid="RRSwISC6to18E3r5" rof_grid="r05">
-      <map name="ROF2OCN_ICE_RMAPNAME">cpl/cpl6/map_r05_to_RRSwISC6to18E3r5.cstmnn.r250e1250_58NS.20240328.nc</map>
+      <map name="ROF2OCN_ICE_RMAPNAME">cpl/cpl6/map_r05_to_RRSwISC6to18E3r5_cstmnn.r250e1250_58NS.20240328.nc</map>
       <map name="ROF2OCN_LIQ_RMAPNAME">cpl/cpl6/map_r05_to_RRSwISC6to18E3r5_cstmnn.r50e100.20240328.nc</map>
     </gridmap>
 
+    <gridmap ocn_grid="SOwISC12to30E3r3" rof_grid="r05">
+      <map name="ROF2OCN_ICE_RMAPNAME">cpl/cpl6/map_r05_to_SOwISC12to30E3r3_cstmnn.r150e300.20240808.nc</map>
+      <map name="ROF2OCN_LIQ_RMAPNAME">cpl/cpl6/map_r05_to_SOwISC12to30E3r3_cstmnn.r150e300.20240808.nc</map>
+    </gridmap>
+
     <gridmap ocn_grid="IcoswISC30E3r5" rof_grid="r025">
       <map name="ROF2OCN_ICE_RMAPNAME">cpl/cpl6/map_r025_to_IcoswISC30E3r5_cstmnn.r150e300.20240401.nc</map>
       <map name="ROF2OCN_LIQ_RMAPNAME">cpl/cpl6/map_r025_to_IcoswISC30E3r5_cstmnn.r150e300.20240401.nc</map>
diff --git a/components/elm/bld/namelist_files/namelist_definition.xml b/components/elm/bld/namelist_files/namelist_definition.xml
index 7063d7a11054..83e7fcf94906 100644
--- a/components/elm/bld/namelist_files/namelist_definition.xml
+++ b/components/elm/bld/namelist_files/namelist_definition.xml
@@ -1491,7 +1491,7 @@ 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,IcosXISC30E3r7,RRSwISC6to18E3r5">
+       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,RRSwISC6to18E3r5,SOwISC12to30E3r3">
 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 fd2785616655..e76c18a1c7e4 100644
--- a/components/mpas-ocean/bld/namelist_files/namelist_defaults_mpaso.xml
+++ b/components/mpas-ocean/bld/namelist_files/namelist_defaults_mpaso.xml
@@ -55,6 +55,7 @@
 <config_dt ocn_grid="FRISwISC02to60E3r1">'00:02:00'</config_dt>
 <config_dt ocn_grid="FRISwISC01to60E3r1">'00:01:00'</config_dt>
 <config_dt ocn_grid="RRSwISC6to18E3r5">'00:05:00'</config_dt>
+<config_dt ocn_grid="SOwISC12to30E3r3">'00:10:00'</config_dt>
 <config_time_integrator>'split_explicit_ab2'</config_time_integrator>
 <config_number_of_time_levels>2</config_number_of_time_levels>
 
@@ -85,6 +86,7 @@
 <config_hmix_scaleWithMesh ocn_grid="FRISwISC02to60E3r1">.true.</config_hmix_scaleWithMesh>
 <config_hmix_scaleWithMesh ocn_grid="FRISwISC01to60E3r1">.true.</config_hmix_scaleWithMesh>
 <config_hmix_scaleWithMesh ocn_grid="RRSwISC6to18E3r5">.true.</config_hmix_scaleWithMesh>
+<config_hmix_scaleWithMesh ocn_grid="SOwISC12to30E3r3">.true.</config_hmix_scaleWithMesh>
 <config_maxMeshDensity>-1.0</config_maxMeshDensity>
 <config_hmix_use_ref_cell_width>.false.</config_hmix_use_ref_cell_width>
 <config_hmix_ref_cell_width>30.0e3</config_hmix_ref_cell_width>
@@ -107,6 +109,7 @@
 <config_use_mom_del2 ocn_grid="FRISwISC02to60E3r1">.true.</config_use_mom_del2>
 <config_use_mom_del2 ocn_grid="FRISwISC01to60E3r1">.true.</config_use_mom_del2>
 <config_use_mom_del2 ocn_grid="RRSwISC6to18E3r5">.true.</config_use_mom_del2>
+<config_use_mom_del2 ocn_grid="SOwISC12to30E3r3">.true.</config_use_mom_del2>
 <config_mom_del2>10.0</config_mom_del2>
 <config_mom_del2 ocn_grid="oEC60to30v3">1000.0</config_mom_del2>
 <config_mom_del2 ocn_grid="oEC60to30v3wLI">1000.0</config_mom_del2>
@@ -123,6 +126,7 @@
 <config_mom_del2 ocn_grid="FRISwISC02to60E3r1">77.0</config_mom_del2>
 <config_mom_del2 ocn_grid="FRISwISC01to60E3r1">38.5</config_mom_del2>
 <config_mom_del2 ocn_grid="RRSwISC6to18E3r5">100.0</config_mom_del2>
+<config_mom_del2 ocn_grid="SOwISC12to30E3r3">462.0</config_mom_del2>
 <config_use_tracer_del2>.false.</config_use_tracer_del2>
 <config_tracer_del2>10.0</config_tracer_del2>
 
@@ -154,6 +158,7 @@
 <config_mom_del4 ocn_grid="FRISwISC02to60E3r1">5.46e07</config_mom_del4>
 <config_mom_del4 ocn_grid="FRISwISC01to60E3r1">6.83e06</config_mom_del4>
 <config_mom_del4 ocn_grid="RRSwISC6to18E3r5">3.2e09</config_mom_del4>
+<config_mom_del4 ocn_grid="SOwISC12to30E3r3">1.18e10</config_mom_del4>
 <config_mom_del4_div_factor>1.0</config_mom_del4_div_factor>
 <config_use_tracer_del4>.false.</config_use_tracer_del4>
 <config_tracer_del4>0.0</config_tracer_del4>
@@ -191,6 +196,7 @@
 <config_Redi_horizontal_taper ocn_grid="FRISwISC04to60E3r1">'RossbyRadius'</config_Redi_horizontal_taper>
 <config_Redi_horizontal_taper ocn_grid="FRISwISC02to60E3r1">'RossbyRadius'</config_Redi_horizontal_taper>
 <config_Redi_horizontal_taper ocn_grid="FRISwISC01to60E3r1">'RossbyRadius'</config_Redi_horizontal_taper>
+<config_Redi_horizontal_taper ocn_grid="SOwISC12to30E3r3">'RossbyRadius'</config_Redi_horizontal_taper>
 <config_Redi_horizontal_ramp_min>20e3</config_Redi_horizontal_ramp_min>
 <config_Redi_horizontal_ramp_min ocn_grid="WCAtl12to45E2r4">30e3</config_Redi_horizontal_ramp_min>
 <config_Redi_horizontal_ramp_max>30e3</config_Redi_horizontal_ramp_max>
@@ -222,6 +228,7 @@
 <config_GM_closure ocn_grid="FRISwISC04to60E3r1">'N2_dependent'</config_GM_closure>
 <config_GM_closure ocn_grid="FRISwISC02to60E3r1">'N2_dependent'</config_GM_closure>
 <config_GM_closure ocn_grid="FRISwISC01to60E3r1">'N2_dependent'</config_GM_closure>
+<config_GM_closure ocn_grid="SOwISC12to30E3r3">'N2_dependent'</config_GM_closure>
 <config_GM_constant_kappa>900.0</config_GM_constant_kappa>
 <config_GM_constant_kappa ocn_forcing="datm_forced_restoring" ocn_grid="oEC60to30v3wLI">600.0</config_GM_constant_kappa>
 <config_GM_constant_kappa ocn_forcing="datm_forced_restoring" ocn_grid="ECwISC30to60E1r2">600.0</config_GM_constant_kappa>
@@ -236,6 +243,7 @@
 <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>
 <config_GM_constant_kappa ocn_forcing="datm_forced_restoring" ocn_grid="FRISwISC01to60E3r1">600.0</config_GM_constant_kappa>
+<config_GM_constant_kappa ocn_forcing="datm_forced_restoring" ocn_grid="SOwISC12to30E3r3">600.0</config_GM_constant_kappa>
 <config_GM_constant_bclModeSpeed>0.3</config_GM_constant_bclModeSpeed>
 <config_GM_minBclModeSpeed_method>'constant'</config_GM_minBclModeSpeed_method>
 <config_GM_spatially_variable_min_kappa>300.0</config_GM_spatially_variable_min_kappa>
@@ -249,6 +257,7 @@
 <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>
 <config_GM_spatially_variable_baroclinic_mode ocn_grid="FRISwISC01to60E3r1">1.0</config_GM_spatially_variable_baroclinic_mode>
+<config_GM_spatially_variable_baroclinic_mode ocn_grid="SOwISC12to30E3r3">1.0</config_GM_spatially_variable_baroclinic_mode>
 <config_GM_Visbeck_alpha>0.13</config_GM_Visbeck_alpha>
 <config_GM_Visbeck_max_depth>1000.0</config_GM_Visbeck_max_depth>
 <config_GM_EG_riMin>200.0</config_GM_EG_riMin>
@@ -264,6 +273,7 @@
 <config_GM_horizontal_taper ocn_grid="FRISwISC04to60E3r1">'RossbyRadius'</config_GM_horizontal_taper>
 <config_GM_horizontal_taper ocn_grid="FRISwISC02to60E3r1">'RossbyRadius'</config_GM_horizontal_taper>
 <config_GM_horizontal_taper ocn_grid="FRISwISC01to60E3r1">'RossbyRadius'</config_GM_horizontal_taper>
+<config_GM_horizontal_taper ocn_grid="SOwISC12to30E3r3">'RossbyRadius'</config_GM_horizontal_taper>
 <config_GM_horizontal_ramp_min>20e3</config_GM_horizontal_ramp_min>
 <config_GM_horizontal_ramp_min ocn_grid="WCAtl12to45E2r4">30e3</config_GM_horizontal_ramp_min>
 <config_GM_horizontal_ramp_max>30e3</config_GM_horizontal_ramp_max>
@@ -416,6 +426,7 @@
 <config_land_ice_flux_mode ocn_grid="FRISwISC02to60E3r1">'pressure_only'</config_land_ice_flux_mode>
 <config_land_ice_flux_mode ocn_grid="FRISwISC01to60E3r1">'pressure_only'</config_land_ice_flux_mode>
 <config_land_ice_flux_mode ocn_grid="RRSwISC6to18E3r5">'pressure_only'</config_land_ice_flux_mode>
+<config_land_ice_flux_mode ocn_grid="SOwISC12to30E3r3">'pressure_only'</config_land_ice_flux_mode>
 <config_land_ice_flux_formulation>'Jenkins'</config_land_ice_flux_formulation>
 <config_land_ice_flux_useHollandJenkinsAdvDiff>.false.</config_land_ice_flux_useHollandJenkinsAdvDiff>
 <config_land_ice_flux_attenuation_coefficient>10.0</config_land_ice_flux_attenuation_coefficient>
@@ -435,6 +446,7 @@
 <config_land_ice_flux_explicit_topDragCoeff ocn_grid="FRISwISC02to60E3r1">4.48e-3</config_land_ice_flux_explicit_topDragCoeff>
 <config_land_ice_flux_explicit_topDragCoeff ocn_grid="FRISwISC01to60E3r1">4.48e-3</config_land_ice_flux_explicit_topDragCoeff>
 <config_land_ice_flux_explicit_topDragCoeff ocn_grid="RRSwISC6to18E3r5">4.48e-3</config_land_ice_flux_explicit_topDragCoeff>
+<config_land_ice_flux_explicit_topDragCoeff ocn_grid="SOwISC12to30E3r3">4.48e-3</config_land_ice_flux_explicit_topDragCoeff>
 <config_land_ice_flux_ISOMIP_gammaT>1e-4</config_land_ice_flux_ISOMIP_gammaT>
 <config_land_ice_flux_jenkins_heat_transfer_coefficient>0.011</config_land_ice_flux_jenkins_heat_transfer_coefficient>
 <config_land_ice_flux_jenkins_heat_transfer_coefficient ocn_grid="oEC60to30v3wLI">0.00295</config_land_ice_flux_jenkins_heat_transfer_coefficient>
@@ -448,6 +460,7 @@
 <config_land_ice_flux_jenkins_heat_transfer_coefficient ocn_grid="FRISwISC02to60E3r1">0.00295</config_land_ice_flux_jenkins_heat_transfer_coefficient>
 <config_land_ice_flux_jenkins_heat_transfer_coefficient ocn_grid="FRISwISC01to60E3r1">0.00295</config_land_ice_flux_jenkins_heat_transfer_coefficient>
 <config_land_ice_flux_jenkins_heat_transfer_coefficient ocn_grid="RRSwISC6to18E3r5">0.00295</config_land_ice_flux_jenkins_heat_transfer_coefficient>
+<config_land_ice_flux_jenkins_heat_transfer_coefficient ocn_grid="SOwISC12to30E3r3">0.00295</config_land_ice_flux_jenkins_heat_transfer_coefficient>
 <config_land_ice_flux_jenkins_salt_transfer_coefficient>3.1e-4</config_land_ice_flux_jenkins_salt_transfer_coefficient>
 <config_land_ice_flux_jenkins_salt_transfer_coefficient ocn_grid="oEC60to30v3wLI">8.42e-5</config_land_ice_flux_jenkins_salt_transfer_coefficient>
 <config_land_ice_flux_jenkins_salt_transfer_coefficient ocn_grid="ECwISC30to60E1r2">8.42e-5</config_land_ice_flux_jenkins_salt_transfer_coefficient>
@@ -460,6 +473,7 @@
 <config_land_ice_flux_jenkins_salt_transfer_coefficient ocn_grid="FRISwISC02to60E3r1">8.42e-5</config_land_ice_flux_jenkins_salt_transfer_coefficient>
 <config_land_ice_flux_jenkins_salt_transfer_coefficient ocn_grid="FRISwISC01to60E3r1">8.42e-5</config_land_ice_flux_jenkins_salt_transfer_coefficient>
 <config_land_ice_flux_jenkins_salt_transfer_coefficient ocn_grid="RRSwISC6to18E3r5">8.42e-5</config_land_ice_flux_jenkins_salt_transfer_coefficient>
+<config_land_ice_flux_jenkins_salt_transfer_coefficient ocn_grid="SOwISC12to30E3r3">8.42e-5</config_land_ice_flux_jenkins_salt_transfer_coefficient>
 <config_land_ice_flux_tidal_Jourdain_alpha>1.0</config_land_ice_flux_tidal_Jourdain_alpha>
 <config_land_ice_flux_tidal_Jourdain_A0>0.0</config_land_ice_flux_tidal_Jourdain_A0>
 <config_land_ice_flux_tidal_Jourdain_U0>5e-2</config_land_ice_flux_tidal_Jourdain_U0>
@@ -492,6 +506,7 @@
 <config_implicit_top_drag_coeff ocn_grid="FRISwISC02to60E3r1">4.48e-3</config_implicit_top_drag_coeff>
 <config_implicit_top_drag_coeff ocn_grid="FRISwISC01to60E3r1">4.48e-3</config_implicit_top_drag_coeff>
 <config_implicit_top_drag_coeff ocn_grid="RRSwISC6to18E3r5">4.48e-3</config_implicit_top_drag_coeff>
+<config_implicit_top_drag_coeff ocn_grid="SOwISC12to30E3r3">4.48e-3</config_implicit_top_drag_coeff>
 <config_loglaw_bottom_roughness>1.0e-3</config_loglaw_bottom_roughness>
 <config_loglaw_layer_depth_max>10.0</config_loglaw_layer_depth_max>
 <config_loglaw_bottom_drag_min>2.5e-3</config_loglaw_bottom_drag_min>
@@ -579,6 +594,7 @@
 <config_btr_dt ocn_grid="FRISwISC02to60E3r1">'0000_00:00:02.5'</config_btr_dt>
 <config_btr_dt ocn_grid="FRISwISC01to60E3r1">'0000_00:00:01.25'</config_btr_dt>
 <config_btr_dt ocn_grid="RRSwISC6to18E3r5">'0000_00:00:05'</config_btr_dt>
+<config_btr_dt ocn_grid="SOwISC12to30E3r3">'0000_00:00:15'</config_btr_dt>
 <config_n_btr_cor_iter>2</config_n_btr_cor_iter>
 <config_vel_correction>.true.</config_vel_correction>
 <config_btr_subcycle_loop_factor>2</config_btr_subcycle_loop_factor>
@@ -626,6 +642,7 @@
 <config_check_ssh_consistency ocn_grid="FRISwISC02to60E3r1">.false.</config_check_ssh_consistency>
 <config_check_ssh_consistency ocn_grid="FRISwISC01to60E3r1">.false.</config_check_ssh_consistency>
 <config_check_ssh_consistency ocn_grid="RRSwISC6to18E3r5">.false.</config_check_ssh_consistency>
+<config_check_ssh_consistency ocn_grid="SOwISC12to30E3r3">.false.</config_check_ssh_consistency>
 <config_filter_btr_mode>.false.</config_filter_btr_mode>
 <config_prescribe_velocity>.false.</config_prescribe_velocity>
 <config_prescribe_thickness>.false.</config_prescribe_thickness>
@@ -1153,6 +1170,7 @@
 <config_AM_mocStreamfunction_enable ocn_grid="FRISwISC02to60E3r1">.true.</config_AM_mocStreamfunction_enable>
 <config_AM_mocStreamfunction_enable ocn_grid="FRISwISC01to60E3r1">.true.</config_AM_mocStreamfunction_enable>
 <config_AM_mocStreamfunction_enable ocn_grid="RRSwISC6to18E3r5">.true.</config_AM_mocStreamfunction_enable>
+<config_AM_mocStreamfunction_enable ocn_grid="SOwISC12to30E3r3">.true.</config_AM_mocStreamfunction_enable>
 <config_AM_mocStreamfunction_compute_interval>'0000-00-00_01:00:00'</config_AM_mocStreamfunction_compute_interval>
 <config_AM_mocStreamfunction_output_stream>'mocStreamfunctionOutput'</config_AM_mocStreamfunction_output_stream>
 <config_AM_mocStreamfunction_compute_on_startup>.true.</config_AM_mocStreamfunction_compute_on_startup>
@@ -1241,6 +1259,7 @@
 <config_AM_conservationCheck_enable ocn_grid="FRISwISC02to60E3r1">.true.</config_AM_conservationCheck_enable>
 <config_AM_conservationCheck_enable ocn_grid="FRISwISC01to60E3r1">.true.</config_AM_conservationCheck_enable>
 <config_AM_conservationCheck_enable ocn_grid="RRSwISC6to18E3r5">.true.</config_AM_conservationCheck_enable>
+<config_AM_conservationCheck_enable ocn_grid="SOwISC12to30E3r3">.true.</config_AM_conservationCheck_enable>
 <config_AM_conservationCheck_compute_interval>'dt'</config_AM_conservationCheck_compute_interval>
 <config_AM_conservationCheck_output_stream>'conservationCheckOutput'</config_AM_conservationCheck_output_stream>
 <config_AM_conservationCheck_compute_on_startup>.false.</config_AM_conservationCheck_compute_on_startup>
@@ -1253,6 +1272,7 @@
 <config_AM_conservationCheck_compute_on_startup ocn_grid="FRISwISC02to60E3r1">.true.</config_AM_conservationCheck_compute_on_startup>
 <config_AM_conservationCheck_compute_on_startup ocn_grid="FRISwISC01to60E3r1">.true.</config_AM_conservationCheck_compute_on_startup>
 <config_AM_conservationCheck_compute_on_startup ocn_grid="RRSwISC6to18E3r5">.true.</config_AM_conservationCheck_compute_on_startup>
+<config_AM_conservationCheck_compute_on_startup ocn_grid="SOwISC12to30E3r3">.true.</config_AM_conservationCheck_compute_on_startup>
 <config_AM_conservationCheck_write_on_startup>.false.</config_AM_conservationCheck_write_on_startup>
 <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>
@@ -1263,6 +1283,7 @@
 <config_AM_conservationCheck_write_on_startup ocn_grid="FRISwISC02to60E3r1">.true.</config_AM_conservationCheck_write_on_startup>
 <config_AM_conservationCheck_write_on_startup ocn_grid="FRISwISC01to60E3r1">.true.</config_AM_conservationCheck_write_on_startup>
 <config_AM_conservationCheck_write_on_startup ocn_grid="RRSwISC6to18E3r5">.true.</config_AM_conservationCheck_write_on_startup>
+<config_AM_conservationCheck_write_on_startup ocn_grid="SOwISC12to30E3r3">.true.</config_AM_conservationCheck_write_on_startup>
 <config_AM_conservationCheck_write_to_logfile>.true.</config_AM_conservationCheck_write_to_logfile>
 <config_AM_conservationCheck_restart_stream>'conservationCheckRestart'</config_AM_conservationCheck_restart_stream>
 
diff --git a/components/mpas-ocean/cime_config/buildnml b/components/mpas-ocean/cime_config/buildnml
index 8f5193c334be..d987f8df2365 100755
--- a/components/mpas-ocean/cime_config/buildnml
+++ b/components/mpas-ocean/cime_config/buildnml
@@ -406,6 +406,20 @@ def buildnml(case, caseroot, compname):
         if ocn_ismf == 'data':
             data_ismf_file = 'prescribed_ismf_paolo2023.RRSwISC6to18E3r5.20240327.nc'
 
+    elif ocn_grid == 'SOwISC12to30E3r3':
+        decomp_date = '20240829'
+        decomp_prefix = 'partitions/mpas-o.graph.info.'
+        restoring_file = 'sss.PHC2_monthlyClimatology.SOwISC12to30E3r3.20240829.nc'
+        analysis_mask_file = 'SOwISC12to30E3r3_mocBasinsAndTransects20210623.nc'
+        ic_date = '20240829'
+        ic_prefix = 'mpaso.SOwISC12to30E3r3'
+        if ocn_ic_mode == 'spunup':
+            ic_date = '20240829'
+            ic_prefix = 'mpaso.SOwISC12to30E3r3.rstFromG-chrysalis'
+        if ocn_ismf == 'data':
+            data_ismf_file = 'prescribed_ismf_paolo2023.SOwISC12to30E3r3.20240829.nc'
+
+
     #--------------------------------------------------------------------
     # 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 d62797de4518..69294640ff67 100644
--- a/components/mpas-seaice/bld/namelist_files/namelist_defaults_mpassi.xml
+++ b/components/mpas-seaice/bld/namelist_files/namelist_defaults_mpassi.xml
@@ -31,6 +31,7 @@
 <config_dt ice_grid="FRISwISC02to60E3r1">120.0</config_dt>
 <config_dt ice_grid="FRISwISC01to60E3r1">60.0</config_dt>
 <config_dt ice_grid="RRSwISC6to18E3r5">900.0</config_dt>
+<config_dt ice_grid="SOwISC12to30E3r3">1800.0</config_dt>
 <config_calendar_type>'noleap'</config_calendar_type>
 <config_start_time>'2000-01-01_00:00:00'</config_start_time>
 <config_stop_time>'none'</config_stop_time>
@@ -87,6 +88,7 @@
 <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>
 <config_initial_latitude_north ice_grid="FRISwISC01to60E3r1">85.0</config_initial_latitude_north>
+<config_initial_latitude_north ice_grid="SOwISC12to30E3r3">85.0</config_initial_latitude_north>
 <config_initial_latitude_north ice_grid="ARRM10to60E2r1">75.0</config_initial_latitude_north>
 <config_initial_latitude_north ice_grid="oRRS30to10v3wLI">85.0</config_initial_latitude_north>
 <config_initial_latitude_north ice_grid="oRRS18to6v3">85.0</config_initial_latitude_north>
@@ -102,6 +104,7 @@
 <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>
 <config_initial_latitude_south ice_grid="FRISwISC01to60E3r1">-85.0</config_initial_latitude_south>
+<config_initial_latitude_south ice_grid="SOwISC12to30E3r3">-85.0</config_initial_latitude_south>
 <config_initial_latitude_south ice_grid="ARRM10to60E2r1">-85.0</config_initial_latitude_south>
 <config_initial_latitude_south ice_grid="oRRS30to10v3wLI">-85.0</config_initial_latitude_south>
 <config_initial_latitude_south ice_grid="oRRS18to6v3">-85.0</config_initial_latitude_south>
@@ -170,6 +173,7 @@
 <config_dynamics_subcycle_number ice_grid="FRISwISC02to60E3r1">1</config_dynamics_subcycle_number>
 <config_dynamics_subcycle_number ice_grid="FRISwISC01to60E3r1">1</config_dynamics_subcycle_number>
 <config_dynamics_subcycle_number ice_grid="RRSwISC6to18E3r5">2</config_dynamics_subcycle_number>
+<config_dynamics_subcycle_number ice_grid="SOwISC12to30E3r3">1</config_dynamics_subcycle_number>
 <config_rotate_cartesian_grid>true</config_rotate_cartesian_grid>
 <config_include_metric_terms>true</config_include_metric_terms>
 <config_elastic_subcycle_number>120</config_elastic_subcycle_number>
diff --git a/components/mpas-seaice/cime_config/buildnml b/components/mpas-seaice/cime_config/buildnml
index c38ca08a31da..471fbf9233f2 100755
--- a/components/mpas-seaice/cime_config/buildnml
+++ b/components/mpas-seaice/cime_config/buildnml
@@ -330,6 +330,16 @@ def buildnml(case, caseroot, compname):
             logger.warning("WARNING: The specified compset is requesting seaice ICs spunup from a G-case")
             logger.warning("         But no file available for this grid.")
 
+    elif ice_grid == 'SOwISC12to30E3r3':
+        grid_date = '20240829'
+        grid_prefix = 'mpassi.SOwISC12to30E3r3'
+        decomp_date = '20240829'
+        decomp_prefix = 'partitions/mpas-seaice.graph.info.'
+        data_iceberg_file = 'Iceberg_Climatology_Merino.SOwISC12to30E3r3.20240829.nc'
+        if ice_ic_mode == 'spunup':
+            grid_date = '20240829'
+            grid_prefix = 'mpassi.SOwISC12to30E3r3.rstFromG-chrysalis'
+
     elif ice_grid == 'ICOS10':
         grid_date = '211015'
         grid_prefix = 'seaice.ICOS10'