Index: LMDZ5/trunk/DefLists/field_def_lmdz.xml
===================================================================
--- LMDZ5/trunk/DefLists/field_def_lmdz.xml	(revision 2540)
+++ LMDZ5/trunk/DefLists/field_def_lmdz.xml	(revision 2541)
@@ -589,4 +589,5 @@
         <field id="rsdcs4co2"    long_name="Downwelling CS SW 4xCO2 atmosphere"    unit="W/m2" />
         <field id="rldcs4co2"    long_name="Downwelling CS LW 4xCO2 atmosphere"    unit="W/m2" />
+        <field id="stratomask"    long_name="Stratospheric fraction"    unit="-" />
     </field_group>
     
Index: LMDZ5/trunk/libf/phylmd/phys_output_write_mod.F90
===================================================================
--- LMDZ5/trunk/libf/phylmd/phys_output_write_mod.F90	(revision 2540)
+++ LMDZ5/trunk/libf/phylmd/phys_output_write_mod.F90	(revision 2541)
@@ -1063,6 +1063,8 @@
        CALL histwrite_phy(o_zfull,zphi/RG)
 
-       CALL histwrite_phy(o_stratomask, stratomask)
-
+       IF (flag_aerosol_strat.EQ.2) THEN
+         CALL histwrite_phy(o_stratomask, stratomask)
+       ENDIF
+      
        IF (vars_defined)  THEN
         zx_tmp_fi3d(:,1)= pphis(:)/RG