diff --git a/tools/analysis/MOM6_refineDiag.csh b/tools/analysis/MOM6_refineDiag.csh
index 48f4df0694..a0b4e6fd92 100755
--- a/tools/analysis/MOM6_refineDiag.csh
+++ b/tools/analysis/MOM6_refineDiag.csh
@@ -97,7 +97,7 @@ echo '====annual mean Eddy Kinetic Energy======'
 mkdir -p $out_dir/refineDiag_ocean_annual/ocean_${yr1}/EddyKineticEnergy
 
 $script_dir/EddyKineticEnergy.py  -g $yr1.ocean_static.nc -o $out_dir/refineDiag_ocean_annual/ocean_${yr1}/EddyKineticEnergy -l ${yr1} $yr1.ocean_daily.nc
-$script_dir/calc_variance.py ssh $yr1.ocean_daily.nc $refineDiagDir/$yr1.ocean_month_refined.nc
+$script_dir/calc_variance.py zos $yr1.ocean_daily.nc $refineDiagDir/$yr1.ocean_month_refined.nc
 
 echo "  ---------- end yearly analysis ----------  "