diff --git a/src/MNH/ini_seriesn.f90 b/src/MNH/ini_seriesn.f90
index dbb0030186716cf329c841a8027b1773de9dfe54..45bdbdcca4945fcc696de676559089056cc5ec4c 100644
--- a/src/MNH/ini_seriesn.f90
+++ b/src/MNH/ini_seriesn.f90
@@ -1,4 +1,4 @@
-!MNH_LIC Copyright 2002-2019 CNRS, Meteo-France and Universite Paul Sabatier
+!MNH_LIC Copyright 2002-2021 CNRS, Meteo-France and Universite Paul Sabatier
 !MNH_LIC This is part of the Meso-NH software governed by the CeCILL-C licence
 !MNH_LIC version 1. See LICENSE, CeCILL-C_V1-en.txt and CeCILL-C_V1-fr.txt
 !MNH_LIC for details. version 1.
@@ -43,7 +43,7 @@
 !  P. Wautelet 10/04/2019: replace ABORT and STOP calls by Print_msg
 !  P. Wautelet 12/04/2019: use standard measurement units
 !  P. Wautelet 13/09/2019: budget: simplify and modernize date/time management
-!
+!  P. Wautelet 05/05/2021: add CSMASK1/2/3 variables
 !-------------------------------------------------------------------------------
 !
 !*    0. Declaration
@@ -88,6 +88,7 @@ INTEGER :: IIDIM1 ! I size of the slice
 INTEGER :: JJ,JI ! loop indices
 INTEGER :: ISB1,ISB2,ISB3
 INTEGER :: ISER
+CHARACTER (LEN=4), DIMENSION(3) :: YMASK
 CHARACTER (LEN=5), DIMENSION(3) :: YSUF
 INTEGER  :: ILUOUT ! Logical unit number for output-listing
 INTEGER  :: IRESP   ! Return code of FM-routines
@@ -258,6 +259,9 @@ ALLOCATE( CSTITLE3   (NSTEMP_SERIE3) )
 ALLOCATE( CSUNIT1    (NSTEMP_SERIE1) )
 ALLOCATE( CSUNIT2    (NSTEMP_SERIE2) )
 ALLOCATE( CSUNIT3    (NSTEMP_SERIE3) )
+ALLOCATE( CSMASK1    (NSTEMP_SERIE1) )
+ALLOCATE( CSMASK2    (NSTEMP_SERIE2) )
+! ALLOCATE( CSMASK3    (NSTEMP_SERIE3) )
 ALLOCATE( NSGRIDD1   (NSTEMP_SERIE1) )
 ALLOCATE( NSGRIDD2   (NSTEMP_SERIE2) )
 ALLOCATE( NSGRIDD3   (NSTEMP_SERIE3) )
@@ -304,6 +308,10 @@ IF (LMASKLANDSEA) ISER=3
 YSUF(1)='-GLOB'
 YSUF(2)='-LAND'
 YSUF(3)='-SEA '
+
+YMASK(1) = 'GLOB'
+YMASK(2) = 'LAND'
+YMASK(3) = 'SEA'
 !
 !*       2.1   Temporal series t
 !              -----------------
@@ -319,38 +327,38 @@ ISB1=0
 DO JI=1,ISER
   ! total surface explicit precipitations
   IF (SIZE(XINPRR)/=0) THEN
-    ISB1=ISB1+1 ; CSTITLE1(ISB1)='INPRT'//YSUF(JI) ; CSUNIT1(ISB1)='mm day-1'
-    ISB1=ISB1+1 ; CSTITLE1(ISB1)='ACPRT'//YSUF(JI) ; CSUNIT1(ISB1)='mm'
+    ISB1=ISB1+1 ; CSTITLE1(ISB1)='INPRT'//YSUF(JI) ; CSUNIT1(ISB1)='mm day-1' ; CSMASK1(ISB1) = YMASK(JI)
+    ISB1=ISB1+1 ; CSTITLE1(ISB1)='ACPRT'//YSUF(JI) ; CSUNIT1(ISB1)='mm'       ; CSMASK1(ISB1) = YMASK(JI)
   END IF
   ! Mixing ratios
   IF (LUSERV) THEN
-    ISB1=ISB1+1 ; CSTITLE1(ISB1)='RVT'//YSUF(JI) ; CSUNIT1(ISB1)='kg m-2'
+    ISB1=ISB1+1 ; CSTITLE1(ISB1)='RVT'//YSUF(JI) ; CSUNIT1(ISB1)='kg m-2'     ; CSMASK1(ISB1) = YMASK(JI)
   END IF
   IF (LUSERC) THEN
-    ISB1=ISB1+1 ; CSTITLE1(ISB1)='RCT'//YSUF(JI) ; CSUNIT1(ISB1)='kg m-2'
+    ISB1=ISB1+1 ; CSTITLE1(ISB1)='RCT'//YSUF(JI) ; CSUNIT1(ISB1)='kg m-2'     ; CSMASK1(ISB1) = YMASK(JI)
   END IF
   IF (LUSERR) THEN
-    ISB1=ISB1+1 ; CSTITLE1(ISB1)='RRT'//YSUF(JI) ; CSUNIT1(ISB1)='kg m-2'
+    ISB1=ISB1+1 ; CSTITLE1(ISB1)='RRT'//YSUF(JI) ; CSUNIT1(ISB1)='kg m-2'     ; CSMASK1(ISB1) = YMASK(JI)
   ENDIF
   IF (LUSERI) THEN
-    ISB1=ISB1+1 ; CSTITLE1(ISB1)='RIT'//YSUF(JI) ; CSUNIT1(ISB1)='kg m-2'
+    ISB1=ISB1+1 ; CSTITLE1(ISB1)='RIT'//YSUF(JI) ; CSUNIT1(ISB1)='kg m-2'     ; CSMASK1(ISB1) = YMASK(JI)
   END IF
   IF (LUSERS) THEN
-    ISB1=ISB1+1 ; CSTITLE1(ISB1)='RST'//YSUF(JI) ; CSUNIT1(ISB1)='kg m-2'
+    ISB1=ISB1+1 ; CSTITLE1(ISB1)='RST'//YSUF(JI) ; CSUNIT1(ISB1)='kg m-2'     ; CSMASK1(ISB1) = YMASK(JI)
   END IF
   IF (LUSERG) THEN
-    ISB1=ISB1+1 ; CSTITLE1(ISB1)='RGT'//YSUF(JI) ; CSUNIT1(ISB1)='kg m-2'
+    ISB1=ISB1+1 ; CSTITLE1(ISB1)='RGT'//YSUF(JI) ; CSUNIT1(ISB1)='kg m-2'     ; CSMASK1(ISB1) = YMASK(JI)
   END IF
   IF (LUSERH) THEN
-    ISB1=ISB1+1 ; CSTITLE1(ISB1)='RHT'//YSUF(JI) ; CSUNIT1(ISB1)='kg m-2'
+    ISB1=ISB1+1 ; CSTITLE1(ISB1)='RHT'//YSUF(JI) ; CSUNIT1(ISB1)='kg m-2'     ; CSMASK1(ISB1) = YMASK(JI)
   END IF
 ! SURFACE FIELDS
   IF (LSURF) THEN
-     ISB1=ISB1+1 ; CSTITLE1(ISB1)='TS_WATER'//YSUF(JI) ; CSUNIT1(ISB1)='K'
-     ISB1=ISB1+1 ; CSTITLE1(ISB1)='T_MNW_WATER'//YSUF(JI) ; CSUNIT1(ISB1)='K'
-     ISB1=ISB1+1 ; CSTITLE1(ISB1)='T_BOT_WATER'//YSUF(JI) ; CSUNIT1(ISB1)='K'
-     ISB1=ISB1+1 ; CSTITLE1(ISB1)='CT_WATER'//YSUF(JI) ; CSUNIT1(ISB1)='1'
-     ISB1=ISB1+1 ; CSTITLE1(ISB1)='HML_WATER'//YSUF(JI) ; CSUNIT1(ISB1)='m'
+     ISB1=ISB1+1 ; CSTITLE1(ISB1)='TS_WATER'//YSUF(JI) ;    CSUNIT1(ISB1)='K' ; CSMASK1(ISB1) = YMASK(JI)
+     ISB1=ISB1+1 ; CSTITLE1(ISB1)='T_MNW_WATER'//YSUF(JI) ; CSUNIT1(ISB1)='K' ; CSMASK1(ISB1) = YMASK(JI)
+     ISB1=ISB1+1 ; CSTITLE1(ISB1)='T_BOT_WATER'//YSUF(JI) ; CSUNIT1(ISB1)='K' ; CSMASK1(ISB1) = YMASK(JI)
+     ISB1=ISB1+1 ; CSTITLE1(ISB1)='CT_WATER'//YSUF(JI) ;    CSUNIT1(ISB1)='1' ; CSMASK1(ISB1) = YMASK(JI)
+     ISB1=ISB1+1 ; CSTITLE1(ISB1)='HML_WATER'//YSUF(JI) ;   CSUNIT1(ISB1)='m' ; CSMASK1(ISB1) = YMASK(JI)
   ENDIF
   ! end SURFACE FIELDS
 END DO
@@ -358,9 +366,9 @@ END DO
 IF (LWMINMAX) THEN
     DO JI=1,ISER
     ! Max of vertical speed
-    ISB1=ISB1+1 ; CSTITLE1(ISB1)='WMAX'//YSUF(JI) ; CSUNIT1(ISB1)='m s-1' ; NSGRIDD1(ISB1)=4
+    ISB1=ISB1+1 ; CSTITLE1(ISB1)='WMAX'//YSUF(JI) ; CSUNIT1(ISB1)='m s-1' ; NSGRIDD1(ISB1)=4 ; CSMASK1(ISB1) = YMASK(JI)
     ! Min of vertical speed
-    ISB1=ISB1+1 ; CSTITLE1(ISB1)='WMIN'//YSUF(JI) ; CSUNIT1(ISB1)='m s-1' ; NSGRIDD1(ISB1)=4
+    ISB1=ISB1+1 ; CSTITLE1(ISB1)='WMIN'//YSUF(JI) ; CSUNIT1(ISB1)='m s-1' ; NSGRIDD1(ISB1)=4 ; CSMASK1(ISB1) = YMASK(JI)
   END DO
 END IF
 !
@@ -384,29 +392,29 @@ NSGRIDD2(:)=1
 ISB2=0
 DO JI=1,ISER
   ! Vertical velocity
-  ISB2=ISB2+1 ; CSTITLE2(ISB2)='WT'//YSUF(JI) ; CSUNIT2(ISB2)='m s-1' ; NSGRIDD2(ISB2)=4
+  ISB2=ISB2+1 ; CSTITLE2(ISB2)='WT'//YSUF(JI) ; CSUNIT2(ISB2)='m s-1'      ; CSMASK2(ISB2) = YMASK(JI) ; NSGRIDD2(ISB2)=4
   ! Potential temperature
-  ISB2=ISB2+1 ; CSTITLE2(ISB2)='THT'//YSUF(JI) ; CSUNIT2(ISB2)='K'
+  ISB2=ISB2+1 ; CSTITLE2(ISB2)='THT'//YSUF(JI) ; CSUNIT2(ISB2)='K'         ; CSMASK2(ISB2) = YMASK(JI)
   ! Pressure
-  ISB2=ISB2+1 ; CSTITLE2(ISB2)='PABST'//YSUF(JI) ; CSUNIT2(ISB2)='Pa'
+  ISB2=ISB2+1 ; CSTITLE2(ISB2)='PABST'//YSUF(JI) ; CSUNIT2(ISB2)='Pa'      ; CSMASK2(ISB2) = YMASK(JI)
   ! Mixing ratios
   IF (LUSERV) THEN
-    ISB2=ISB2+1 ; CSTITLE2(ISB2)='RVT'//YSUF(JI) ; CSUNIT2(ISB2)='kg kg-1'
+    ISB2=ISB2+1 ; CSTITLE2(ISB2)='RVT'//YSUF(JI) ; CSUNIT2(ISB2)='kg kg-1' ; CSMASK2(ISB2) = YMASK(JI)
   END IF
   IF (LUSERC) THEN
-    ISB2=ISB2+1 ; CSTITLE2(ISB2)='RCT'//YSUF(JI) ; CSUNIT2(ISB2)='kg kg-1'
+    ISB2=ISB2+1 ; CSTITLE2(ISB2)='RCT'//YSUF(JI) ; CSUNIT2(ISB2)='kg kg-1' ; CSMASK2(ISB2) = YMASK(JI)
   END IF
   IF (LUSERR) THEN
-    ISB2=ISB2+1 ; CSTITLE2(ISB2)='RRT'//YSUF(JI) ; CSUNIT2(ISB2)='kg kg-1'
+    ISB2=ISB2+1 ; CSTITLE2(ISB2)='RRT'//YSUF(JI) ; CSUNIT2(ISB2)='kg kg-1' ; CSMASK2(ISB2) = YMASK(JI)
   END IF
   IF (LUSERI) THEN
-    ISB2=ISB2+1 ; CSTITLE2(ISB2)='RIT'//YSUF(JI) ; CSUNIT2(ISB2)='kg kg-1'
+    ISB2=ISB2+1 ; CSTITLE2(ISB2)='RIT'//YSUF(JI) ; CSUNIT2(ISB2)='kg kg-1' ; CSMASK2(ISB2) = YMASK(JI)
   END IF
   IF (LUSERS) THEN
-    ISB2=ISB2+1 ; CSTITLE2(ISB2)='RST'//YSUF(JI) ; CSUNIT2(ISB2)='kg kg-1'
+    ISB2=ISB2+1 ; CSTITLE2(ISB2)='RST'//YSUF(JI) ; CSUNIT2(ISB2)='kg kg-1' ; CSMASK2(ISB2) = YMASK(JI)
   END IF
   IF (LUSERG) THEN
-    ISB2=ISB2+1 ; CSTITLE2(ISB2)='RGT'//YSUF(JI) ; CSUNIT2(ISB2)='kg kg-1'
+    ISB2=ISB2+1 ; CSTITLE2(ISB2)='RGT'//YSUF(JI) ; CSUNIT2(ISB2)='kg kg-1' ; CSMASK2(ISB2) = YMASK(JI)
   END IF
 END DO
 !
diff --git a/src/MNH/modd_seriesn.f90 b/src/MNH/modd_seriesn.f90
index 03ab9f206df8701771193cbe8960cec8394ee320..b407ae675e0c28458fbc50ca03bcce61e273d138 100644
--- a/src/MNH/modd_seriesn.f90
+++ b/src/MNH/modd_seriesn.f90
@@ -1,4 +1,4 @@
-!MNH_LIC Copyright 1998-2019 CNRS, Meteo-France and Universite Paul Sabatier
+!MNH_LIC Copyright 1998-2021 CNRS, Meteo-France and Universite Paul Sabatier
 !MNH_LIC This is part of the Meso-NH software governed by the CeCILL-C licence
 !MNH_LIC version 1. See LICENSE, CeCILL-C_V1-en.txt and CeCILL-C_V1-fr.txt
 !MNH_LIC for details. version 1.
@@ -33,6 +33,7 @@
 !!                Oct. 10,1998 (Lafore) adaptation of Diagnostics 
 !!                                      to the sequential nesting version
 !  P. Wautelet 13/09/2019: budget: simplify and modernize date/time management
+!  P. Wautelet 05/05/2021: add CSMASK1/2/3 variables
 !-------------------------------------------------------------------------------
 !
 !*       0.   DECLARATIONS
@@ -79,6 +80,9 @@ TYPE SERIES_t
 !     associated with the 1st group
   CHARACTER(LEN=100),DIMENSION(:),POINTER :: CSUNIT2=>NULL() ! with the 2nd
   CHARACTER(LEN=100),DIMENSION(:),POINTER :: CSUNIT3=>NULL() ! with the 3rd
+  CHARACTER(LEN=4),  DIMENSION(:),POINTER :: CSMASK1=>NULL()
+  CHARACTER(LEN=4),  DIMENSION(:),POINTER :: CSMASK2=>NULL()
+!   CHARACTER(LEN=4),  DIMENSION(:),POINTER :: CSMASK3=>NULL()
   INTEGER       , DIMENSION(:)  ,POINTER :: NSGRIDD1=>NULL() !grid indicator for the 1st serie
   INTEGER       , DIMENSION(:)  ,POINTER :: NSGRIDD2=>NULL() ! for the  2nd 
   INTEGER       , DIMENSION(:)  ,POINTER :: NSGRIDD3=>NULL() ! for the 3rd 
@@ -135,6 +139,9 @@ CHARACTER(LEN=100),DIMENSION(:),POINTER :: CSTITLE3=>NULL()
 CHARACTER(LEN=100),DIMENSION(:),POINTER :: CSUNIT1=>NULL()
 CHARACTER(LEN=100),DIMENSION(:),POINTER :: CSUNIT2=>NULL()
 CHARACTER(LEN=100),DIMENSION(:),POINTER :: CSUNIT3=>NULL()
+CHARACTER(LEN=4),  DIMENSION(:),POINTER :: CSMASK1=>NULL()
+CHARACTER(LEN=4),  DIMENSION(:),POINTER :: CSMASK2=>NULL()
+! CHARACTER(LEN=4),  DIMENSION(:),POINTER :: CSMASK3=>NULL()
 INTEGER       , DIMENSION(:)  ,POINTER :: NSGRIDD1=>NULL()
 INTEGER       , DIMENSION(:)  ,POINTER :: NSGRIDD2=>NULL()
 INTEGER       , DIMENSION(:)  ,POINTER :: NSGRIDD3=>NULL()
@@ -181,6 +188,9 @@ SERIES_MODEL(KFROM)%CSTITLE3=>CSTITLE3
 SERIES_MODEL(KFROM)%CSUNIT1=>CSUNIT1
 SERIES_MODEL(KFROM)%CSUNIT2=>CSUNIT2
 SERIES_MODEL(KFROM)%CSUNIT3=>CSUNIT3
+SERIES_MODEL(KFROM)%CSMASK1=>CSMASK1
+SERIES_MODEL(KFROM)%CSMASK2=>CSMASK2
+! SERIES_MODEL(KFROM)%CSMASK3=>CSMASK3
 SERIES_MODEL(KFROM)%NSGRIDD1=>NSGRIDD1
 SERIES_MODEL(KFROM)%NSGRIDD2=>NSGRIDD2
 SERIES_MODEL(KFROM)%NSGRIDD3=>NSGRIDD3
@@ -220,6 +230,9 @@ CSTITLE3=>SERIES_MODEL(KTO)%CSTITLE3
 CSUNIT1=>SERIES_MODEL(KTO)%CSUNIT1
 CSUNIT2=>SERIES_MODEL(KTO)%CSUNIT2
 CSUNIT3=>SERIES_MODEL(KTO)%CSUNIT3
+CSMASK1=>SERIES_MODEL(KTO)%CSMASK1
+CSMASK2=>SERIES_MODEL(KTO)%CSMASK2
+! CSMASK3=>SERIES_MODEL(KTO)%CSMASK3
 NSGRIDD1=>SERIES_MODEL(KTO)%NSGRIDD1
 NSGRIDD2=>SERIES_MODEL(KTO)%NSGRIDD2
 NSGRIDD3=>SERIES_MODEL(KTO)%NSGRIDD3