Fix OpenMP over-allocation of resources in exglobal_atmos_products.sh when running MPMD tasks (#2212)

Fix OpenMP over-allocation of resources running MPMD tasks
Co-authored-by: Innocent Souopgui <isouopgui@redlineperf.com>

Author: souopgui

scripts/exglobal_atmos_products.sh

@@ -129,7 +129,7 @@ for (( nset=1 ; nset <= downset ; nset++ )); do
 
   # Run with MPMD or serial
   if [[ "${USE_CFP:-}" = "YES" ]]; then
-    "${HOMEgfs}/ush/run_mpmd.sh" "${DATA}/poescript"
+    OMP_NUM_THREADS=1 "${HOMEgfs}/ush/run_mpmd.sh" "${DATA}/poescript"
     export err=$?
   else
     chmod 755 "${DATA}/poescript"