Index: trunk/LMDZ.MARS/deftank/xios/field_def_physics_mars.xml
===================================================================
--- trunk/LMDZ.MARS/deftank/xios/field_def_physics_mars.xml	(revision 4162)
+++ trunk/LMDZ.MARS/deftank/xios/field_def_physics_mars.xml	(revision 4166)
@@ -427,4 +427,7 @@
 
             <!-- water cycle -->
+            <field id="watercaptag"
+                   long_name="Perennial water ice location"
+                   unit="T/F" />
             <field id="watercap"
                    long_name="Perennial water ice thickness"