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!MNH_LIC Copyright 1994-2020 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.
MODULE MODE_ICE4_FAST_RS
IMPLICIT NONE
CONTAINS
SUBROUTINE ICE4_FAST_RS(KPROMA,KSIZE, LDSOFT, PCOMPUTE, &
&PRHODREF, PLVFACT, PLSFACT, PPRES, &
&PDV, PKA, PCJ, &
&PLBDAR, PLBDAS, &
&PT, PRVT, PRCT, PRRT, PRST, &
&PRIAGGS, &
&PRCRIMSS, PRCRIMSG, PRSRIMCG, &
&PRRACCSS, PRRACCSG, PRSACCRG, PRSMLTG, &
&PRCMLTSR, &
&PRS_TEND, &
&PA_TH, PA_RC, PA_RR, PA_RS, PA_RG)
!!
!!** PURPOSE
!! -------
!! Computes the fast rs processes
!!
!! AUTHOR
!! ------
!! S. Riette from the splitting of rain_ice source code (nov. 2014)
!!
!! MODIFICATIONS
!! -------------
!!
! P. Wautelet 26/04/2019: replace non-standard FLOAT function by REAL function
! P. Wautelet 29/05/2019: remove PACK/UNPACK intrinsics (to get more performance and better OpenACC support)
!! R. El Khatib 24-Aug-2021 Optimizations
!
!
!* 0. DECLARATIONS
! ------------
!
USE MODD_CST, ONLY: XALPI, XALPW, XBETAI, XBETAW, XCI, XCL, XCPV, XESTT, XGAMI, XGAMW, &
& XLMTT, XLVTT, XMD, XMV, XRV, XTT, XEPSILO
USE MODD_PARAM_ICE, ONLY: LEVLIMIT, CSNOWRIMING
USE MODD_RAIN_ICE_DESCR, ONLY: XBS, XCEXVT, XCXS, XRTMIN
USE MODD_RAIN_ICE_PARAM, ONLY: NACCLBDAR, NACCLBDAS, NGAMINC, X0DEPS, X1DEPS, XACCINTP1R, XACCINTP1S, &
& XACCINTP2R, XACCINTP2S, XCRIMSG, XCRIMSS, XEX0DEPS, XEX1DEPS, XEXCRIMSG, &
& XEXCRIMSS, XEXSRIMCG, XEXSRIMCG2, XFRACCSS, XFSACCRG, XFSCVMG, XGAMINC_RIM1, &
& XGAMINC_RIM1, XGAMINC_RIM2, XGAMINC_RIM4, XKER_RACCS, XKER_RACCSS, &
& XKER_SACCRG, XLBRACCS1, XLBRACCS2, XLBRACCS3, XLBSACCR1, XLBSACCR2, XLBSACCR3, &
& XRIMINTP1, XRIMINTP2, XSRIMCG, XSRIMCG2, XSRIMCG3
USE PARKIND1, ONLY : JPRB
USE YOMHOOK , ONLY : LHOOK, DR_HOOK
!
IMPLICIT NONE
!
!* 0.1 Declarations of dummy arguments :
!
INTEGER, INTENT(IN) :: KPROMA,KSIZE
LOGICAL, INTENT(IN) :: LDSOFT
REAL, DIMENSION(KSIZE), INTENT(IN) :: PCOMPUTE
REAL, DIMENSION(KSIZE), INTENT(IN) :: PRHODREF ! Reference density
REAL, DIMENSION(KSIZE), INTENT(IN) :: PLVFACT
REAL, DIMENSION(KSIZE), INTENT(IN) :: PLSFACT
REAL, DIMENSION(KSIZE), INTENT(IN) :: PPRES ! absolute pressure at t
REAL, DIMENSION(KSIZE), INTENT(IN) :: PDV ! Diffusivity of water vapor in the air
REAL, DIMENSION(KSIZE), INTENT(IN) :: PKA ! Thermal conductivity of the air
REAL, DIMENSION(KSIZE), INTENT(IN) :: PCJ ! Function to compute the ventilation coefficient
REAL, DIMENSION(KSIZE), INTENT(IN) :: PLBDAR ! Slope parameter of the raindrop distribution
REAL, DIMENSION(KSIZE), INTENT(IN) :: PLBDAS ! Slope parameter of the aggregate distribution
REAL, DIMENSION(KSIZE), INTENT(IN) :: PT ! Temperature
REAL, DIMENSION(KSIZE), INTENT(IN) :: PRVT ! Water vapor m.r. at t
REAL, DIMENSION(KSIZE), INTENT(IN) :: PRCT ! Cloud water m.r. at t
REAL, DIMENSION(KSIZE), INTENT(IN) :: PRRT ! Rain water m.r. at t
REAL, DIMENSION(KSIZE), INTENT(IN) :: PRST ! Snow/aggregate m.r. at t
REAL, DIMENSION(KSIZE), INTENT(IN) :: PRIAGGS ! r_i aggregation on r_s
REAL, DIMENSION(KSIZE), INTENT(OUT) :: PRCRIMSS ! Cloud droplet riming of the aggregates
REAL, DIMENSION(KSIZE), INTENT(OUT) :: PRCRIMSG ! Cloud droplet riming of the aggregates
REAL, DIMENSION(KSIZE), INTENT(OUT) :: PRSRIMCG ! Cloud droplet riming of the aggregates
REAL, DIMENSION(KSIZE), INTENT(OUT) :: PRRACCSS ! Rain accretion onto the aggregates
REAL, DIMENSION(KSIZE), INTENT(OUT) :: PRRACCSG ! Rain accretion onto the aggregates
REAL, DIMENSION(KSIZE), INTENT(OUT) :: PRSACCRG ! Rain accretion onto the aggregates
REAL, DIMENSION(KSIZE), INTENT(INOUT) :: PRSMLTG ! Conversion-Melting of the aggregates
REAL, DIMENSION(KSIZE), INTENT(INOUT) :: PRCMLTSR ! Cloud droplet collection onto aggregates by positive temperature
REAL, DIMENSION(KPROMA, 8), INTENT(INOUT) :: PRS_TEND ! Individual tendencies
REAL, DIMENSION(KSIZE), INTENT(INOUT) :: PA_TH
REAL, DIMENSION(KSIZE), INTENT(INOUT) :: PA_RC
REAL, DIMENSION(KSIZE), INTENT(INOUT) :: PA_RR
REAL, DIMENSION(KSIZE), INTENT(INOUT) :: PA_RS
REAL, DIMENSION(KSIZE), INTENT(INOUT) :: PA_RG
!
!* 0.2 declaration of local variables
!
INTEGER, PARAMETER :: IRCRIMS=1, IRCRIMSS=2, IRSRIMCG=3, IRRACCS=4, IRRACCSS=5, IRSACCRG=6, &
& IFREEZ1=7, IFREEZ2=8
REAL, DIMENSION(KSIZE) :: ZRIM, ZACC, ZMASK
LOGICAL, DIMENSION(KSIZE) :: GRIM, GACC
INTEGER :: IGRIM, IGACC
INTEGER, DIMENSION(KSIZE) :: I1
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REAL, DIMENSION(KSIZE) :: ZVEC1, ZVEC2, ZVEC3
INTEGER, DIMENSION(KSIZE) :: IVEC1, IVEC2
REAL, DIMENSION(KSIZE) :: ZZW, ZZW2, ZZW6, ZFREEZ_RATE
INTEGER :: JJ, JL
REAL(KIND=JPRB) :: ZHOOK_HANDLE
!-------------------------------------------------------------------------------
!
IF (LHOOK) CALL DR_HOOK('ICE4_FAST_RS', 0, ZHOOK_HANDLE)
!
!
!-------------------------------------------------------------------------------
!
!
!* 5.0 maximum freezing rate
!
DO JL=1, KSIZE
ZMASK(JL)=MAX(0., -SIGN(1., XRTMIN(5)-PRST(JL))) * & ! WHERE(PRST(:)>XRTMIN(5))
&PCOMPUTE(JL)
ENDDO
IF(LDSOFT) THEN
DO JL=1, KSIZE
PRS_TEND(JL, IFREEZ1)=ZMASK(JL) * PRS_TEND(JL, IFREEZ1)
PRS_TEND(JL, IFREEZ2)=ZMASK(JL) * PRS_TEND(JL, IFREEZ2)
ENDDO
ELSE
DO JL=1, KSIZE
PRS_TEND(JL, IFREEZ1)=ZMASK(JL) * PRVT(JL)*PPRES(JL)/(XEPSILO+PRVT(JL)) ! Vapor pressure
ENDDO
IF(LEVLIMIT) THEN
WHERE(ZMASK(1:KSIZE)==1.)
PRS_TEND(1:KSIZE, IFREEZ1)=MIN(PRS_TEND(1:KSIZE, IFREEZ1), EXP(XALPI-XBETAI/PT(1:KSIZE)-XGAMI*ALOG(PT(1:KSIZE)))) ! min(ev, es_i(T))
END WHERE
ENDIF
PRS_TEND(:, IFREEZ2)=0.
WHERE(ZMASK(1:KSIZE)==1.)
PRS_TEND(1:KSIZE, IFREEZ1)=PKA(1:KSIZE)*(XTT-PT(1:KSIZE)) + &
(PDV(1:KSIZE)*(XLVTT+(XCPV-XCL)*(PT(1:KSIZE)-XTT)) &
*(XESTT-PRS_TEND(1:KSIZE, IFREEZ1))/(XRV*PT(1:KSIZE)) )
PRS_TEND(1:KSIZE, IFREEZ1)=PRS_TEND(1:KSIZE, IFREEZ1)* ( X0DEPS* PLBDAS(1:KSIZE)**XEX0DEPS + &
X1DEPS*PCJ(1:KSIZE)*PLBDAS(1:KSIZE)**XEX1DEPS )/ &
( PRHODREF(1:KSIZE)*(XLMTT-XCL*(XTT-PT(1:KSIZE))) )
PRS_TEND(1:KSIZE, IFREEZ2)=(PRHODREF(1:KSIZE)*(XLMTT+(XCI-XCL)*(XTT-PT(1:KSIZE))) ) / &
( PRHODREF(1:KSIZE)*(XLMTT-XCL*(XTT-PT(1:KSIZE))) )
END WHERE
ENDIF
DO JL=1, KSIZE
!We must agregate, at least, the cold species
!And we are only interested by the freezing rate of liquid species
ZFREEZ_RATE(JL)=ZMASK(JL) * MAX(0., MAX(0., PRS_TEND(JL, IFREEZ1) + &
&PRS_TEND(JL, IFREEZ2) * PRIAGGS(JL)) - &
PRIAGGS(JL))
ENDDO
!
!* 5.1 cloud droplet riming of the aggregates
!
DO JL=1, KSIZE
ZRIM(JL)=MAX(0., -SIGN(1., XRTMIN(2)-PRCT(JL))) * & !WHERE(PRCT(:)>XRTMIN(2))
&MAX(0., -SIGN(1., XRTMIN(5)-PRST(JL))) * & !WHERE(PRST(:)>XRTMIN(5))
&PCOMPUTE(JL)
IF (ZRIM(JL)>0) THEN
IGRIM = IGRIM + 1
I1(IGRIM) = JL
GRIM(JL) = .TRUE.
ELSE
GRIM(JL) = .FALSE.
ENDIF
ENDDO
!
! Collection of cloud droplets by snow: this rate is used for riming (T<0) and for conversion/melting (T>0)
IF(LDSOFT) THEN
DO JL=1, KSIZE
PRS_TEND(JL, IRCRIMS)=ZRIM(JL) * PRS_TEND(JL, IRCRIMS)
PRS_TEND(JL, IRCRIMSS)=ZRIM(JL) * PRS_TEND(JL, IRCRIMSS)
PRS_TEND(JL, IRSRIMCG)=ZRIM(JL) * PRS_TEND(JL, IRSRIMCG)
ENDDO
ELSE
PRS_TEND(:, IRCRIMS)=0.
PRS_TEND(:, IRCRIMSS)=0.
PRS_TEND(:, IRSRIMCG)=0.
!
IF(IGRIM>0) THEN
!
! 5.1.1 select the PLBDAS
!
DO JJ = 1, IGRIM
ZVEC1(JJ) = PLBDAS(I1(JJ))
END DO
!
! 5.1.2 find the next lower indice for the PLBDAS in the geometrical
! set of Lbda_s used to tabulate some moments of the incomplete
! gamma function
!
ZVEC2(1:IGRIM) = MAX( 1.00001, MIN( REAL(NGAMINC)-0.00001, &
XRIMINTP1 * LOG( ZVEC1(1:IGRIM) ) + XRIMINTP2 ) )
IVEC2(1:IGRIM) = INT( ZVEC2(1:IGRIM) )
ZVEC2(1:IGRIM) = ZVEC2(1:IGRIM) - REAL( IVEC2(1:IGRIM) )
!
! 5.1.3 perform the linear interpolation of the normalized
! "2+XDS"-moment of the incomplete gamma function
!
ZVEC1(1:IGRIM) = XGAMINC_RIM1( IVEC2(1:IGRIM)+1 )* ZVEC2(1:IGRIM) &
- XGAMINC_RIM1( IVEC2(1:IGRIM) )*(ZVEC2(1:IGRIM) - 1.0)
ZZW(:) = 0.
DO JJ = 1, IGRIM
ZZW(I1(JJ)) = ZVEC1(JJ)
END DO
!
! 5.1.4 riming of the small sized aggregates
!
WHERE (GRIM(1:KSIZE))
PRS_TEND(1:KSIZE, IRCRIMSS) = XCRIMSS * ZZW(1:KSIZE) * PRCT(1:KSIZE) & ! RCRIMSS
* PLBDAS(1:KSIZE)**XEXCRIMSS &
* PRHODREF(1:KSIZE)**(-XCEXVT)
END WHERE
!
! 5.1.5 perform the linear interpolation of the normalized
! "XBS"-moment of the incomplete gamma function (XGAMINC_RIM2) and
! "XBG"-moment of the incomplete gamma function (XGAMINC_RIM4)
!
ZVEC1(1:IGRIM) = XGAMINC_RIM2( IVEC2(1:IGRIM)+1 )* ZVEC2(1:IGRIM) &
- XGAMINC_RIM2( IVEC2(1:IGRIM) )*(ZVEC2(1:IGRIM) - 1.0)
ZZW(:) = 0.
DO JJ = 1, IGRIM
ZZW(I1(JJ)) = ZVEC1(JJ)
END DO
ZVEC1(1:IGRIM) = XGAMINC_RIM4( IVEC2(1:IGRIM)+1 )* ZVEC2(1:IGRIM) &
- XGAMINC_RIM4( IVEC2(1:IGRIM) )*(ZVEC2(1:IGRIM) - 1.0)
ZZW2(:) = 0.
DO JJ = 1, IGRIM
ZZW2(I1(JJ)) = ZVEC1(JJ)
END DO
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!
! 5.1.6 riming-conversion of the large sized aggregates into graupeln
!
!
WHERE(GRIM(1:KSIZE))
PRS_TEND(1:KSIZE, IRCRIMS)=XCRIMSG * PRCT(1:KSIZE) & ! RCRIMS
* PLBDAS(1:KSIZE)**XEXCRIMSG &
* PRHODREF(1:KSIZE)**(-XCEXVT)
ZZW6(1:KSIZE) = PRS_TEND(1:KSIZE, IRCRIMS) - PRS_TEND(1:KSIZE, IRCRIMSS) ! RCRIMSG
END WHERE
IF(CSNOWRIMING=='M90 ')THEN
!Murakami 1990
WHERE(GRIM(1:KSIZE))
PRS_TEND(1:KSIZE, IRSRIMCG)=XSRIMCG * PLBDAS(1:KSIZE)**XEXSRIMCG*(1.0-ZZW(1:KSIZE))
PRS_TEND(1:KSIZE, IRSRIMCG)=ZZW6(1:KSIZE)*PRS_TEND(1:KSIZE, IRSRIMCG)/ &
MAX(1.E-20, &
XSRIMCG3*XSRIMCG2*PLBDAS(1:KSIZE)**XEXSRIMCG2*(1.-ZZW2(1:KSIZE)) - &
XSRIMCG3*PRS_TEND(1:KSIZE, IRSRIMCG))
END WHERE
ELSE
PRS_TEND(:, IRSRIMCG)=0.
END IF
ENDIF
ENDIF
!
DO JL=1, KSIZE
! More restrictive RIM mask to be used for riming by negative temperature only
ZRIM(JL)=ZRIM(JL) * &
&MAX(0., -SIGN(1., PT(JL)-XTT)) ! WHERE(PT(:)<XTT)
PRCRIMSS(JL)=ZRIM(JL)*MIN(ZFREEZ_RATE(JL), PRS_TEND(JL, IRCRIMSS))
ZFREEZ_RATE(JL)=MAX(0., ZFREEZ_RATE(JL)-PRCRIMSS(JL))
ZZW(JL) = MIN(1., ZFREEZ_RATE(JL) / MAX(1.E-20, PRS_TEND(JL, IRCRIMS) - PRCRIMSS(JL))) ! proportion we are able to freeze
PRCRIMSG(JL) = ZRIM(JL) * ZZW(JL) * MAX(0., PRS_TEND(JL, IRCRIMS) - PRCRIMSS(JL)) ! RCRIMSG
ZFREEZ_RATE(JL)=MAX(0., ZFREEZ_RATE(JL)-PRCRIMSG(JL))
PRSRIMCG(JL) = ZRIM(JL) * ZZW(JL) * PRS_TEND(JL, IRSRIMCG)
PRSRIMCG(JL) = PRSRIMCG(JL) * MAX(0., -SIGN(1., -PRCRIMSG(JL)))
PRCRIMSG(JL)=MAX(0., PRCRIMSG(JL))
ENDDO
!
!* 5.2 rain accretion onto the aggregates
!
IGACC = 0
DO JJ = 1, SIZE(GACC)
ZACC(JJ)=MAX(0., -SIGN(1., XRTMIN(3)-PRRT(JJ))) * & !WHERE(PRRT(:)>XRTMIN(3))
&MAX(0., -SIGN(1., XRTMIN(5)-PRST(JJ))) * & !WHERE(PRST(:)>XRTMIN(5))
&PCOMPUTE(JJ)
IF (ZACC(JJ)>0) THEN
IGACC = IGACC + 1
I1(IGACC) = JJ
GACC(JJ) = .TRUE.
ELSE
GACC(JJ) = .FALSE.
END IF
ENDDO
IF(LDSOFT) THEN
DO JL=1, KSIZE
PRS_TEND(JL, IRRACCS)=ZACC(JL) * PRS_TEND(JL, IRRACCS)
PRS_TEND(JL, IRRACCSS)=ZACC(JL) * PRS_TEND(JL, IRRACCSS)
PRS_TEND(JL, IRSACCRG)=ZACC(JL) * PRS_TEND(JL, IRSACCRG)
ENDDO
ELSE
PRS_TEND(:, IRRACCS)=0.
PRS_TEND(:, IRRACCSS)=0.
PRS_TEND(:, IRSACCRG)=0.
IF(IGACC>0)THEN
!
!
! 5.2.1 select the (PLBDAS,PLBDAR) couplet
!
DO JJ = 1, IGACC
ZVEC1(JJ) = PLBDAS(I1(JJ))
ZVEC2(JJ) = PLBDAR(I1(JJ))
ENDDO
!
! 5.2.2 find the next lower indice for the PLBDAS and for the PLBDAR
! in the geometrical set of (Lbda_s,Lbda_r) couplet use to
! tabulate the RACCSS-kernel
!
ZVEC1(1:IGACC) = MAX( 1.00001, MIN( REAL(NACCLBDAS)-0.00001, &
XACCINTP1S * LOG( ZVEC1(1:IGACC) ) + XACCINTP2S ) )
IVEC1(1:IGACC) = INT( ZVEC1(1:IGACC) )
ZVEC1(1:IGACC) = ZVEC1(1:IGACC) - REAL( IVEC1(1:IGACC) )
!
ZVEC2(1:IGACC) = MAX( 1.00001, MIN( REAL(NACCLBDAR)-0.00001, &
XACCINTP1R * LOG( ZVEC2(1:IGACC) ) + XACCINTP2R ) )
IVEC2(1:IGACC) = INT( ZVEC2(1:IGACC) )
ZVEC2(1:IGACC) = ZVEC2(1:IGACC) - REAL( IVEC2(1:IGACC) )
!
! 5.2.3 perform the bilinear interpolation of the normalized
! RACCSS-kernel
!
DO JJ = 1, IGACC
ZVEC3(JJ) = ( XKER_RACCSS(IVEC1(JJ)+1,IVEC2(JJ)+1)* ZVEC2(JJ) &
- XKER_RACCSS(IVEC1(JJ)+1,IVEC2(JJ) )*(ZVEC2(JJ) - 1.0) ) &
* ZVEC1(JJ) &
- ( XKER_RACCSS(IVEC1(JJ) ,IVEC2(JJ)+1)* ZVEC2(JJ) &
- XKER_RACCSS(IVEC1(JJ) ,IVEC2(JJ) )*(ZVEC2(JJ) - 1.0) ) &
* (ZVEC1(JJ) - 1.0)
END DO
ZZW(:) = 0.
DO JJ = 1, IGACC
ZZW(I1(JJ)) = ZVEC3(JJ)
END DO
!
! 5.2.4 raindrop accretion on the small sized aggregates
!
WHERE(GACC(1:KSIZE))
ZZW6(1:KSIZE) = & !! coef of RRACCS
XFRACCSS*( PLBDAS(1:KSIZE)**XCXS )*( PRHODREF(1:KSIZE)**(-XCEXVT-1.) ) &
*( XLBRACCS1/((PLBDAS(1:KSIZE)**2) ) + &
XLBRACCS2/( PLBDAS(1:KSIZE) * PLBDAR(1:KSIZE) ) + &
XLBRACCS3/( (PLBDAR(1:KSIZE)**2)) )/PLBDAR(1:KSIZE)**4
PRS_TEND(1:KSIZE, IRRACCSS) =ZZW(1:KSIZE)*ZZW6(1:KSIZE)
END WHERE
!
! 5.2.4b perform the bilinear interpolation of the normalized
! RACCS-kernel
!
DO JJ = 1, IGACC
ZVEC3(JJ) = ( XKER_RACCS(IVEC1(JJ)+1,IVEC2(JJ)+1)* ZVEC2(JJ) &
- XKER_RACCS(IVEC1(JJ)+1,IVEC2(JJ) )*(ZVEC2(JJ) - 1.0) ) &
* ZVEC1(JJ) &
- ( XKER_RACCS(IVEC1(JJ) ,IVEC2(JJ)+1)* ZVEC2(JJ) &
- XKER_RACCS(IVEC1(JJ) ,IVEC2(JJ) )*(ZVEC2(JJ) - 1.0) ) &
* (ZVEC1(JJ) - 1.0)
END DO
ZZW(:) = 0.
DO JJ = 1, IGACC
ZZW(I1(JJ)) = ZVEC3(JJ)
END DO
WHERE(GACC(1:KSIZE))
PRS_TEND(1:KSIZE, IRRACCS) = ZZW(1:KSIZE)*ZZW6(1:KSIZE)
END WHERE
! 5.2.5 perform the bilinear interpolation of the normalized
! SACCRG-kernel
!
DO JJ = 1, IGACC
ZVEC3(JJ) = ( XKER_SACCRG(IVEC2(JJ)+1,IVEC1(JJ)+1)* ZVEC1(JJ) &
- XKER_SACCRG(IVEC2(JJ)+1,IVEC1(JJ) )*(ZVEC1(JJ) - 1.0) ) &
* ZVEC2(JJ) &
- ( XKER_SACCRG(IVEC2(JJ) ,IVEC1(JJ)+1)* ZVEC1(JJ) &
- XKER_SACCRG(IVEC2(JJ) ,IVEC1(JJ) )*(ZVEC1(JJ) - 1.0) ) &
* (ZVEC2(JJ) - 1.0)
END DO
ZZW(:) = 0.
DO JJ = 1, IGACC
ZZW(I1(JJ)) = ZVEC3(JJ)
END DO
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!
! 5.2.6 raindrop accretion-conversion of the large sized aggregates
! into graupeln
!
WHERE(GACC(1:KSIZE))
PRS_TEND(1:KSIZE, IRSACCRG) = XFSACCRG*ZZW(1:KSIZE)* & ! RSACCRG
( PLBDAS(1:KSIZE)**(XCXS-XBS) )*( PRHODREF(1:KSIZE)**(-XCEXVT-1.) ) &
*( XLBSACCR1/((PLBDAR(1:KSIZE)**2) ) + &
XLBSACCR2/( PLBDAR(1:KSIZE) * PLBDAS(1:KSIZE) ) + &
XLBSACCR3/( (PLBDAS(1:KSIZE)**2)) )/PLBDAR(1:KSIZE)
END WHERE
ENDIF
ENDIF
!
DO JL=1, KSIZE
! More restrictive ACC mask to be used for accretion by negative temperature only
ZACC(JL) = ZACC(JL) * &
&MAX(0., -SIGN(1., PT(JL)-XTT)) ! WHERE(PT(:)<XTT)
PRRACCSS(JL)=ZACC(JL)*MIN(ZFREEZ_RATE(JL), PRS_TEND(JL, IRRACCSS))
ZFREEZ_RATE(JL)=MAX(0., ZFREEZ_RATE(JL)-PRRACCSS(JL))
ZZW(JL) = MIN(1., ZFREEZ_RATE(JL) / MAX(1.E-20, PRS_TEND(JL, IRRACCS)-PRRACCSS(JL))) ! proportion we are able to freeze
PRRACCSG(JL)=ZACC(JL)*ZZW(JL) * MAX(0., PRS_TEND(JL, IRRACCS)-PRRACCSS(JL))
ZFREEZ_RATE(JL) = MAX(0., ZFREEZ_RATE(JL)-PRRACCSG(JL))
PRSACCRG(JL)=ZACC(JL)*ZZW(JL) * PRS_TEND(JL, IRSACCRG)
PRSACCRG(JL) = PRSACCRG(JL) * MAX(0., -SIGN(1., -PRRACCSG(JL)))
PRRACCSG(JL)=MAX(0., PRRACCSG(JL))
ENDDO
!
!
!* 5.3 Conversion-Melting of the aggregates
!
DO JL=1, KSIZE
ZMASK(JL)=MAX(0., -SIGN(1., XRTMIN(5)-PRST(JL))) * & ! WHERE(PRST(:)>XRTMIN(5))
&MAX(0., -SIGN(1., XTT-PT(JL))) * & ! WHERE(PT(:)>XTT)
&PCOMPUTE(JL)
ENDDO
IF(LDSOFT) THEN
DO JL=1, KSIZE
PRSMLTG(JL)=ZMASK(JL)*PRSMLTG(JL)
PRCMLTSR(JL)=ZMASK(JL)*PRCMLTSR(JL)
ENDDO
ELSE
DO JL=1, KSIZE
PRSMLTG(JL)=ZMASK(JL)*PRVT(JL)*PPRES(JL)/(XEPSILO+PRVT(JL)) ! Vapor pressure
ENDDO
IF(LEVLIMIT) THEN
WHERE(ZMASK(:)==1.)
PRSMLTG(:)=MIN(PRSMLTG(:), EXP(XALPW-XBETAW/PT(:)-XGAMW*ALOG(PT(:)))) ! min(ev, es_w(T))
END WHERE
ENDIF
DO JL=1, KSIZE
PRSMLTG(JL)=ZMASK(JL)*( &
& PKA(JL)*(XTT-PT(JL)) + &
& ( PDV(JL)*(XLVTT + ( XCPV - XCL ) * ( PT(JL) - XTT )) &
& *(XESTT-PRSMLTG(JL))/(XRV*PT(JL)) ) &
&)
ENDDO
PRCMLTSR(:) = 0.
WHERE(ZMASK(1:KSIZE)==1.)
!
! compute RSMLT
!
PRSMLTG(1:KSIZE) = XFSCVMG*MAX( 0.0,( -PRSMLTG(1:KSIZE) * &
( X0DEPS* PLBDAS(1:KSIZE)**XEX0DEPS + &
X1DEPS*PCJ(1:KSIZE)*PLBDAS(1:KSIZE)**XEX1DEPS ) - &
( PRS_TEND(1:KSIZE, IRCRIMS) + PRS_TEND(1:KSIZE, IRRACCS) ) * &
( PRHODREF(1:KSIZE)*XCL*(XTT-PT(1:KSIZE))) ) / &
( PRHODREF(1:KSIZE)*XLMTT ) )
! When T < XTT, rc is collected by snow (riming) to produce snow and graupel
! When T > XTT, if riming was still enabled, rc would produce snow and graupel with snow becomming graupel (conversion/melting) and graupel becomming rain (melting)
! To insure consistency when crossing T=XTT, rc collected with T>XTT must be transformed in rain.
! rc cannot produce iced species with a positive temperature but is still collected with a good efficiency by snow
PRCMLTSR(1:KSIZE) = PRS_TEND(1:KSIZE, IRCRIMS) ! both species are liquid, no heat is exchanged
END WHERE
ENDIF
DO JL=1, KSIZE
PA_RC(JL) = PA_RC(JL) - PRCRIMSS(JL)
PA_RS(JL) = PA_RS(JL) + PRCRIMSS(JL)
PA_TH(JL) = PA_TH(JL) + PRCRIMSS(JL)*(PLSFACT(JL)-PLVFACT(JL))
PA_RC(JL) = PA_RC(JL) - PRCRIMSG(JL)
PA_RS(JL) = PA_RS(JL) - PRSRIMCG(JL)
PA_RG(JL) = PA_RG(JL) + PRCRIMSG(JL)+PRSRIMCG(JL)
PA_TH(JL) = PA_TH(JL) + PRCRIMSG(JL)*(PLSFACT(JL)-PLVFACT(JL))
PA_RR(JL) = PA_RR(JL) - PRRACCSS(JL)
PA_RS(JL) = PA_RS(JL) + PRRACCSS(JL)
PA_TH(JL) = PA_TH(JL) + PRRACCSS(JL)*(PLSFACT(JL)-PLVFACT(JL))
PA_RR(JL) = PA_RR(JL) - PRRACCSG(JL)
PA_RS(JL) = PA_RS(JL) - PRSACCRG(JL)
PA_RG(JL) = PA_RG(JL) + PRRACCSG(JL)+PRSACCRG(JL)
PA_TH(JL) = PA_TH(JL) + PRRACCSG(JL)*(PLSFACT(JL)-PLVFACT(JL))
! note that RSCVMG = RSMLT*XFSCVMG but no heat is exchanged (at the rate RSMLT)
! because the graupeln produced by this process are still icy!!!
PA_RS(JL) = PA_RS(JL) - PRSMLTG(JL)
PA_RG(JL) = PA_RG(JL) + PRSMLTG(JL)
PA_RC(JL) = PA_RC(JL) - PRCMLTSR(JL)
PA_RR(JL) = PA_RR(JL) + PRCMLTSR(JL)
ENDDO
IF (LHOOK) CALL DR_HOOK('ICE4_FAST_RS', 1, ZHOOK_HANDLE)
!
END SUBROUTINE ICE4_FAST_RS
END MODULE MODE_ICE4_FAST_RS