From da893cb9db31a0dc651ddbcc342e4634df050cf4 Mon Sep 17 00:00:00 2001
From: Jim Edwards <jedwards@ucar.edu>
Date: Thu, 27 Feb 2025 08:17:33 -0700
Subject: [PATCH 1/2] always set atmocn grid to ogrid with datm

---
 cime_config/namelist_definition_drv.xml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/cime_config/namelist_definition_drv.xml b/cime_config/namelist_definition_drv.xml
index 8835c53b8..f7eb3f656 100644
--- a/cime_config/namelist_definition_drv.xml
+++ b/cime_config/namelist_definition_drv.xml
@@ -917,6 +917,7 @@
       <!-- xgrid introduces unnecessary cost and complexity if atm & ocn are on the same
       grid, so fall back to ogrid in that case -->
       <value samegrid_atm_ocn='true'>ogrid</value>
+      <value COMP_ATM='datm'>ogrid</value>
     </values>
   </entry>
   <entry id="ocn_surface_flux_scheme">

From 7c3581fde820d6ed03d3e4b0753819090478566a Mon Sep 17 00:00:00 2001
From: Jim Edwards <jedwards@ucar.edu>
Date: Thu, 27 Feb 2025 08:37:20 -0700
Subject: [PATCH 2/2] update description

---
 cime_config/namelist_definition_drv.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cime_config/namelist_definition_drv.xml b/cime_config/namelist_definition_drv.xml
index f7eb3f656..ec437189e 100644
--- a/cime_config/namelist_definition_drv.xml
+++ b/cime_config/namelist_definition_drv.xml
@@ -910,7 +910,7 @@
     <valid_values>ogrid,agrid,xgrid</valid_values>
     <desc>
       Grid for atm ocn flux calc
-      default: ogrid
+      default: xgrid for fully coupled cases, ogrid for datm
     </desc>
     <values>
       <value>xgrid</value>