!-------------------------------------- LICENCE BEGIN ------------------------------------
!Environment Canada - Atmospheric Science and Technology License/Disclaimer, 
!                     version 3; Last Modified: May 7, 2008.
!This is free but copyrighted software; you can use/redistribute/modify it under the terms 
!of the Environment Canada - Atmospheric Science and Technology License/Disclaimer 
!version 3 or (at your option) any later version that should be found at: 
!http://collaboration.cmc.ec.gc.ca/science/rpn.comm/license.html 
!
!This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
!without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
!See the above mentioned License/Disclaimer for more details.
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!CANADA, H9P 1J3; or send e-mail to service.rpn@ec.gc.ca
!-------------------------------------- LICENCE END --------------------------------------
!     #######################################

      SUBROUTINE INIT_SNOW_LW(PEMISSN,TPSNOW),4
!     #######################################
!
!!****  *INIT_SNOW_LW* - routine to initialize snow surf. temp and emissivity
!!
!!    PURPOSE
!!    -------
!!
!!**  METHOD
!!    ------
!!
!!    EXTERNAL
!!    --------
!!
!!
!!    IMPLICIT ARGUMENTS
!!    ------------------
!!
!!    REFERENCE
!!    ---------
!!
!!
!!    AUTHOR
!!    ------
!!	V. Masson   *Meteo France*	
!!
!!    MODIFICATIONS
!!    -------------
!!      Original    01/2003 
!-------------------------------------------------------------------------------
!
!*       0.    DECLARATIONS
!              ------------
!
USE MODD_TYPE_SNOW
USE MODD_SURF_PAR,   ONLY : XUNDEF
USE MODD_CSTS,       ONLY : XTT, XLMTT
!
USE MODE_SNOW3L
!
IMPLICIT NONE
!
!*       0.1   Declarations of arguments
!              -------------------------
!
REAL,                 INTENT(IN)    :: PEMISSN ! snow emissivity
TYPE(SURF_SNOW),      INTENT(INOUT) :: TPSNOW  ! snow characteristics
!
!*       0.2   Declarations of local variables
!              -------------------------------
!
INTEGER :: JPATCH ! loop counter on tiles
!-------------------------------------------------------------------------------
!
DO JPATCH=1,SIZE(TPSNOW%WSNOW,3)
!
!*       1.    Emissivity
!              ----------
!
  IF (TPSNOW%SCHEME=='1-L ' .OR. TPSNOW%SCHEME=='3-L ') THEN
    WHERE(TPSNOW%WSNOW(:,1,JPATCH)==0. .OR. TPSNOW%WSNOW(:,1,JPATCH)==XUNDEF )
      TPSNOW%EMIS (:,JPATCH)= XUNDEF
    ELSEWHERE
      TPSNOW%EMIS (:,JPATCH)= PEMISSN
    END WHERE
  END IF
!
!*      2.     Surface temperature
!              -------------------
!
  IF (TPSNOW%SCHEME=='1-L ') THEN
    WHERE(TPSNOW%WSNOW(:,1,JPATCH)==0. .OR. TPSNOW%WSNOW(:,1,JPATCH)==XUNDEF )
      TPSNOW%TS (:,JPATCH)= XUNDEF
    ELSEWHERE
      TPSNOW%TS(:,JPATCH) = TPSNOW%T(:, TPSNOW%NLAYER,JPATCH)
    END WHERE
  END IF
!
  IF (TPSNOW%SCHEME=='3-L ') THEN
    WHERE(TPSNOW%WSNOW(:,1,JPATCH)==0. .OR. TPSNOW%WSNOW(:,1,JPATCH)==XUNDEF )
      TPSNOW%TS (:,JPATCH)= XUNDEF
    ELSEWHERE
      TPSNOW%TS(:,JPATCH) = XTT + ( (TPSNOW%HEAT(:,1,JPATCH)/TPSNOW%WSNOW(:,1,JPATCH)) + XLMTT )  &
                            *(TPSNOW%RHO(:,1,JPATCH)/SNOW3LSCAP(TPSNOW%RHO(:,1,JPATCH)))
      TPSNOW%TS(:,JPATCH) = MIN(XTT, TPSNOW%TS(:,JPATCH))
    END WHERE
  END IF
!
END DO
!
!-------------------------------------------------------------------------------
!
END SUBROUTINE INIT_SNOW_LW