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!
!* 0.1 declarations of arguments
!
REAL, INTENT(IN) :: PTSTEP
! PTSTEP = Model time step (s)
!
REAL, DIMENSION(:), INTENT(IN) :: PLELITTERI
! PLELITTERI = ice sublimation (m s-1)
REAL, DIMENSION(:), INTENT(IN) :: PCTSFC
REAL, DIMENSION(:), INTENT(IN) :: PLSTT
!
REAL, DIMENSION(:), INTENT(INOUT) :: PTL, PWRL, PWRLI
! PTL = litter temperature (K)
! PWRL = litter water content (kg/m2)
! PWRLI = litter ice content (kg/m2)
REAL, DIMENSION(:,:), INTENT(IN) :: PSOILHCAPZ
! PSOILHCAPZ = soil heat capacity [J/(m3 K)]
REAL, DIMENSION(:,:), INTENT(IN) :: PDZG
! PDZG = Layer thickness (DIF option)
REAL, DIMENSION(:), INTENT(IN) :: PGNDLITTER
! PGNDLITTER = Litter thickness (m)
REAL, DIMENSION(:,:), INTENT(INOUT) :: PTG, PWGI, PWG
! PTG = soil temperature (K)
! PWGI = soil volumetric ice content (m3/m3)
! PWG = soil volumetric liquid water content (m3/m3)
!
INTEGER, DIMENSION(:), INTENT(IN) :: KWG_LAYER
! KWG_LAYER = Number of soil moisture layers (DIF option)
!
REAL, DIMENSION(:), INTENT(OUT) :: PPHASEL
! PPHASEL = Phase changement in litter (W/m2)
REAL, DIMENSION(:), INTENT(OUT) :: PLITCOR
! PLITCOR = A possible ice mass correction (to be potentially
! removed from soil) (kg/m2/s)
!
!* 0.2 declarations of local variables
!
INTEGER :: JL ! loop control
!
INTEGER :: INL ! Number of explicit soil layers
!
REAL, DIMENSION(SIZE(PTG,1)) :: ZEXCESS, ZK, ZHCAPL,ZELITTERI, &
ZDELTAT,ZPHASE,ZPHASEM,ZPHASEF,ZPHASEX, &
ZWRL,ZWRLI,Z0,ZPHASEC
!
REAL :: ZPSI
!
REAL(KIND=JPRB) :: ZHOOK_HANDLE
!
!* 0.3 declaration of local parameters
!
REAL, PARAMETER :: ZERTOL = 1.E-6 ! (-) error tolerance
REAL, PARAMETER :: ZTAUICE = 3300. ! (s) litter phase change characteristic time scale
REAL, PARAMETER :: ZWRLSAT = 0.85 ! (m3/m3) litter porosity
!
!-------------------------------------------------------------------------------
!
IF (LHOOK) CALL DR_HOOK('ISBA_MEB:ICE_LITTER',0,ZHOOK_HANDLE)
!
! Initialization:
! ---------------
!
!
INL = MAXVAL(KWG_LAYER(:))
!
ZEXCESS(:) = 0.0
ZPHASEC(:) = 0.0
PLITCOR (:) = 0.0
!
ZHCAPL(:) = 1/(PCTSFC(:)*PGNDLITTER(:))
!
!-------------------------------------------------------------------------------
!
! 1. Surface layer vegetation insulation coefficient (-)
! ---------------------------------------------------
!
! 1.1 Convert to m3/m3
! -----------------
!
ZWRL(:) = PWRL(:) /(XRHOLW*PGNDLITTER(:))
ZWRLI(:) = PWRLI(:)/(XRHOLW*PGNDLITTER(:))
!
! 2. Litter ice evolution computation:
! --------------------------------
!
ZDELTAT(:) = PTL(:) - XTT
!
!
! *Melt* ice if energy and ice available:
!
ZPHASEM(:) = (PTSTEP/ZTAUICE)*MIN((XCI*XRHOLI)*MAX(0.0,ZDELTAT(:)),ZWRLI(:)*(XLMTT*XRHOLW))
!
! *Freeze* liquid water if energy and water available and do not exceed porosity:
!
ZPHASEF(:) = (PTSTEP/ZTAUICE)*MIN((XCI*XRHOLI)*MAX(0.0,-ZDELTAT(:)),ZWRL(:)*(XLMTT*XRHOLW))
ZPHASEF(:) = min(ZPHASEF(:) , (ZWRLSAT - ZWRLI(:)) * (XLMTT*XRHOLW) )
!
ZPHASE(:) = ZPHASEF(:) - ZPHASEM(:)
! Update heat content if melting or freezing
!
PTL(:) = PTL(:) + ZPHASE(:)/ZHCAPL(:)
!
! Get estimate of actual total phase change (J/m3) for equivalent litter water changes:
ZPHASEX(:) = ZPHASE(:)
!
! Adjust ice and liquid water conents (m3/m3) accordingly :
!
ZWRL (:) = ZWRL (:) - ZPHASEX/(XLMTT*XRHOLW)
ZWRLI(:) = ZWRLI(:) + ZPHASEX/(XLMTT*XRHOLW)
!
! 2.1 Convert to Kg/m2
! -----------------
!
PWRL(:) = ZWRL(:) * PGNDLITTER(:) * XRHOLW
PWRLI(:)= ZWRLI(:) * PGNDLITTER(:) * XRHOLW
!
! 3. Adjust litter ice content for sublimation
! -----------------------------------------
!
!
ZELITTERI(:) = PLELITTERI(:) * (PTSTEP/PLSTT)
ZEXCESS(:) = MAX( 0.0 , ZELITTERI(:) - PWRLI(:) )
PLITCOR=ZEXCESS/PTSTEP
PWRLI (:) = PWRLI(:) - ( ZELITTERI(:) - ZEXCESS(:) )
!
! 4. Prevent some possible problems
! ------------------------------
!
PWGI (:,1) = PWGI(:,1)- ZEXCESS(:) / (XRHOLW * PDZG(:,1))
!
ZEXCESS(:) = MAX( 0.0, - PWGI(:,1) )
PWGI(:,1) = PWGI(:,1) + ZEXCESS(:)
PWG (:,1) = PWG (:,1) - ZEXCESS(:)
PTG (:,1) = PTG (:,1) + ZEXCESS(:) * (XLMTT*XRHOLW)/PSOILHCAPZ(:,1)
!
DO JL=1,INL-1
ZEXCESS(:) = MAX(0.0,-PWG(:,JL))
PWG(:,JL+1) = PWG(:,JL+1) - ZEXCESS(:)*PDZG(:,JL)/PDZG(:,JL+1)
PWG(:,JL) = PWG(:,JL) + ZEXCESS(:)
ENDDO
!
! 5. Prevent from keeping track of ice in litter
! -------------------------------------------
!
WHERE (PWRLI(:) < ZERTOL )
PWRL(:) = PWRL(:) + PWRLI(:)
PTL(:) = PTL(:) + PWRLI(:) * XLMTT / PGNDLITTER(:) / ZHCAPL(:)
ZPHASEC(:) = PWRLI(:) * XLMTT / PGNDLITTER(:)
PWRLI(:) = 0.0
ELSEWHERE
ZPHASEC(:) = 0.0
END WHERE
!
PPHASEL(:)=(ZPHASE(:) + ZPHASEC(:))/PTSTEP*PGNDLITTER(:)
!
!
IF (LHOOK) CALL DR_HOOK('ISBA_MEB:ICE_LITTER',1,ZHOOK_HANDLE)
!
END SUBROUTINE ICE_LITTER
!===============================================================================
END SUBROUTINE ISBA_MEB