SUBROUTINE LWBV &
  &( KIDIA, KFDIA, KLON , KLEV  , KMODE &
  &, PDT0 , PEMIS, PEMIW &
  &, PTL  , PTAVE &
  &, PEMIT, PFLUC &
  &, PABCU, PBINT, PBSUI, PCNTRB &
  &)

!**** *LWBV*   - COMPUTE PLANCK FUNC., PERF. VERT. INTEGRATION

!     PURPOSE.
!     --------
!           TO COMPUTE THE PLANCK FUNCTION AND PERFORM THE
!           VERTICAL INTEGRATION. SPLIT OUT FROM LW FOR MEMORY
!           SAVING

!**   INTERFACE.
!     ----------

!        *LWVB* IS CALLED FROM *LW*

!        EXPLICIT ARGUMENTS :
!        --------------------
! PDT0   : (KLON)            ; SURFACE TEMPERATURE DISCONTINUITY
! PEMIS  : (KLON)            ; SURFACE LW EMISSIVITY
! PEMIW  : (KLON)            ; SURFACE LW WINDOW EMISSIVITY
! PTAVE  : (KLON,KLEV)       ; TEMPERATURE
! PTL    : (KLON,KLEV+1)     ; HALF LEVEL TEMPERATURE
!     ==== OUTPUTS ===
! PABCU  :
! PBINT  :
! PBSUI  :
! PCNTRB : 
! PCOLC  :
! PEMIT  :
! PFLUC  :

!        IMPLICIT ARGUMENTS :   NONE
!        --------------------

!     METHOD.
!     -------

!          1. COMPUTES THE PLANCK FUNCTIONS ON THE INTERFACES AND THE
!     GRADIENT OF PLANCK FUNCTIONS IN THE LAYERS.
!          2. PERFORMS THE VERTICAL INTEGRATION DISTINGUISHING THE CON-
!     TRIBUTIONS OF THE ADJACENT AND DISTANT LAYERS AND THOSE FROM THE
!     BOUNDARIES.
!          3. COMPUTES THE CLEAR-SKY COOLING RATES.

!     EXTERNALS.
!     ----------

!          *LWB*, *LWV*

!     REFERENCE.
!     ----------

!        SEE RADIATION'S PART OF THE MODEL'S DOCUMENTATION AND
!        ECMWF RESEARCH DEPARTMENT DOCUMENTATION OF THE IFS

!     AUTHOR.
!     -------
!        JEAN-JACQUES MORCRETTE  *ECMWF*

!     MODIFICATIONS.
!     --------------
!        ORIGINAL : 89-07-14
!        MODIFICATION : 93-10-15 M.HAMRUD (SPLIT OUT FROM LW TO SAVE
!                                          MEMORY)
!-----------------------------------------------------------------------

#include "tsmbkind.h"

USE YOELW    , ONLY : NSIL     ,NIPD     ,NUA
USE YOERDU   , ONLY : NUAER    ,NTRAER


IMPLICIT NONE


!     DUMMY INTEGER SCALARS
INTEGER_M :: KFDIA
INTEGER_M :: KIDIA
INTEGER_M :: KLEV
INTEGER_M :: KLON
INTEGER_M :: KMODE



!-----------------------------------------------------------------------

!*       0.1   ARGUMENTS
!              ---------

REAL_B :: PDT0(KLON)&
  &,  PEMIS(KLON)               , PEMIW(KLON)&
  &,  PTL(KLON,KLEV+1)          , PTAVE(KLON,KLEV)

REAL_B :: PABCU(KLON,NUA,3*KLEV+1)&
  &,  PBINT(KLON,KLEV+1)        , PBSUI(KLON)&
  &,  PCNTRB(KLON,KLEV+1,KLEV+1)&
  &,  PEMIT(KLON)&
  &,  PFLUC(KLON,2,KLEV+1)

!-------------------------------------------------------------------------

!*       0.2   LOCAL ARRAYS
!              ------------
REAL_B ::&
     &ZB(KLON,NSIL,KLEV+1), ZBSUR(KLON,NSIL)   , ZBTOP(KLON,NSIL)&
  &,  ZDBSL(KLON,NSIL,KLEV*2)&
  &,  ZGA(KLON,NIPD,2,KLEV)  , ZGB(KLON,NIPD,2,KLEV)&
  &,  ZGASUR(KLON,NIPD,2)    , ZGBSUR(KLON,NIPD,2)&
  &,  ZGATOP(KLON,NIPD,2)    , ZGBTOP(KLON,NIPD,2)

!     LOCAL INTEGER SCALARS
INTEGER_M :: JL, JLW


!     ------------------------------------------------------------------

!*         2.    COMPUTES PLANCK FUNCTIONS
!                -------------------------

CALL LWB &
 &( KIDIA, KFDIA, KLON  , KLEV  , KMODE &
 &, PDT0 , PTAVE, PTL &
 &, ZB   , PBINT, ZBSUR , ZBTOP , ZDBSL &
 &, ZGA  , ZGB  , ZGASUR, ZGBSUR, ZGATOP, ZGBTOP    &
 &)

!     ------------------------------------------------------------------

!*         3.    PERFORMS THE VERTICAL INTEGRATION
!                ---------------------------------

CALL LWV &
 &( KIDIA , KFDIA, KLON  , KLEV &
 &, NUAER , NTRAER &
 &, PABCU , ZB   , PBINT , ZBSUR , ZBTOP , ZDBSL &
 &, PEMIS , PEMIW &
 &, ZGA   , ZGB  , ZGASUR, ZGBSUR, ZGATOP, ZGBTOP &
 &, PCNTRB, PFLUC &
 &)

DO JL=KIDIA,KFDIA
  PEMIT(JL)=_ZERO_
  PBSUI(JL)=_ZERO_
ENDDO
DO JLW=1,NSIL
  DO JL=KIDIA,KFDIA
    PBSUI(JL)=PBSUI(JL)+ZBSUR(JL,JLW)
    IF (JLW >= 3.AND. JLW <= 4) THEN
      PEMIT(JL)=PEMIT(JL)+ZBSUR(JL,JLW)*PEMIW(JL)
    ELSE
      PEMIT(JL)=PEMIT(JL)+ZBSUR(JL,JLW)*PEMIS(JL)
    ENDIF
  ENDDO
ENDDO
DO JL=KIDIA,KFDIA
  PEMIT(JL)=PEMIT(JL)/PBSUI(JL)
ENDDO

!     ------------------------------------------------------------------

RETURN
END SUBROUTINE LWBV