source: LMDZ6/branches/Amaury_dev/libf/phylmd/lsc_scav.F90 @ 5151

!$Id $

SUBROUTINE lsc_scav(pdtime, it, iflag_lscav, aerosol, &
        oliq, flxr, flxs, rneb, beta_fisrt, &
        beta_v1, pplay, paprs, t, tr_seri, &
        d_tr_insc, d_tr_bcscav, d_tr_evap, qPrls)
  USE ioipsl
  USE dimphy
  USE lmdz_grid_phy
  USE lmdz_phys_para
  USE traclmdz_mod
  USE infotrac_phy, ONLY: nbtr
  USE iophy
  USE lmdz_YOECUMF
  USE lmdz_yomcst

  IMPLICIT NONE
  !=====================================================================
  ! Objet : depot humide (lessivage et evaporation) de traceurs
  ! Inspired by routines of Olivier Boucher (mars 1998)
  ! author R. Pilon 10 octobre 2012
  ! last modification 16/01/2013 (reformulation partie evaporation)
  !=====================================================================

  include "chem.h"

  ! inputs
  REAL, INTENT(IN) :: pdtime ! time step (s)
  INTEGER, INTENT(IN) :: it     ! tracer number
  INTEGER, INTENT(IN) :: iflag_lscav ! LS scavenging param: 3=Reddy_Boucher2004, 4=3+RPilon.
  REAL, DIMENSION(klon, klev + 1), INTENT(IN) :: flxr     ! flux precipitant de pluie
  REAL, DIMENSION(klon, klev + 1), INTENT(IN) :: flxs     ! flux precipitant de neige
  REAL, INTENT(IN) :: oliq ! contenu en eau liquide dans le nuage (kg/kg)
  REAL, DIMENSION(klon, klev), INTENT(IN) :: rneb
  REAL, DIMENSION(klon, klev), INTENT(IN) :: pplay    ! pression
  REAL, DIMENSION(klon, klev + 1), INTENT(IN) :: paprs    ! pression
  REAL, DIMENSION(klon, klev), INTENT(IN) :: t        ! temperature
  ! tracers
  LOGICAL, DIMENSION(nbtr), INTENT(IN) :: aerosol
  REAL, DIMENSION(klon, klev, nbtr), INTENT(IN) :: tr_seri        ! q de traceur
  REAL, DIMENSION(klon, klev), INTENT(IN) :: beta_fisrt     ! taux de conversion de l'eau cond
  REAL, DIMENSION(klon, klev), INTENT(OUT) :: beta_v1        ! -- (originale version)
  REAL, DIMENSION(klon) :: his_dh         ! tendance de traceur integre verticalement
  REAL, DIMENSION(klon, klev, nbtr), INTENT(OUT) :: d_tr_insc      ! tendance du traceur
  REAL, DIMENSION(klon, klev, nbtr), INTENT(OUT) :: d_tr_bcscav  ! tendance de traceur
  REAL, DIMENSION(klon, klev, nbtr), INTENT(OUT) :: d_tr_evap
  REAL, DIMENSION(klon, nbtr), INTENT(OUT) :: qPrls      !jyg: concentration tra dans pluie LS a la surf.
  REAL :: dxin, dxev                              ! tendance temporaire de traceur incloud
  REAL, DIMENSION(klon, klev) :: dxbc       ! tendance temporaire de traceur bc

  !  variables locales
  LOGICAL, SAVE :: debut = .TRUE.
  !$OMP THREADPRIVATE(debut)

  REAL, PARAMETER :: henry = 1.4  ! constante de Henry en mol/l/atm ~1.4 for gases
  REAL :: henry_t    !  constante de Henry a T t  (mol/l/atm)
  REAL, PARAMETER :: kk = 2900.   ! coefficient de dependence en T (K)
  REAL :: f_a     !  rapport de la phase aqueuse a la phase gazeuse
  REAL :: beta    !  taux de conversion de l'eau en pluie

  INTEGER :: i, k
  REAL, DIMENSION(klon, klev) :: scav  !  water liquid content / fraction aqueuse du constituant
  REAL, DIMENSION(klon, klev) :: zrho
  REAL, DIMENSION(klon, klev) :: zdz
  REAL, DIMENSION(klon, klev) :: zmass ! layer mass

  REAL :: frac_ev       ! cste pour la reevaporation : dropplet shrinking
  !  frac_ev = frac_gas ou frac_aer
  REAL, PARAMETER :: frac_gas = 1.0  ! cste pour la reevaporation pour les gaz
  REAL, SAVE :: frac_aer      ! cste pour la reevaporation pour les particules
  REAL, DIMENSION(klon, klev) :: deltaP     ! P(i+1)-P(i)
  REAL, DIMENSION(klon, klev) :: beta_ev    !  dP/P(i+1)
  !$OMP THREADPRIVATE(frac_aer)

  !  101.325  m3/l x Pa/atm
  !  R        Pa.m3/mol/K
  !   cste de dissolution pour le depot humide
  REAL, SAVE :: frac_fine_scav
  REAL, SAVE :: frac_coar_scav
  !$OMP THREADPRIVATE(frac_fine_scav, frac_coar_scav)

  ! below-cloud scav variables
  ! aerosol : alpha_r=0.001, gas 0.001  (Pruppacher & Klett 1967)
  REAL, SAVE :: alpha_r  !  coefficient d'impaction pour la pluie
  REAL, SAVE :: alpha_s  !  coefficient d'impaction pour la neige
  REAL, SAVE :: R_r      !  mean raindrop radius (m)
  REAL, SAVE :: R_s      !  mean snow crystal radius (m)
  !$OMP THREADPRIVATE(alpha_r, alpha_s, R_r, R_s)
  REAL :: pr, ps, ice, water
  !  REAL :: conserv

  IF (debut) THEN

    alpha_r = 0.001        !  coefficient d'impaction pour la pluie
    alpha_s = 0.01         !  coefficient d'impaction pour la neige
    R_r = 0.001            !  mean raindrop radius (m)
    R_s = 0.001            !  mean snow crystal radius (m)
    frac_fine_scav = 0.7
    frac_coar_scav = 0.7
    !     Droplet size shrinks by evap
    frac_aer = 0.5
    debut = .FALSE.

    OPEN(99, file = 'lsc_scav_param.data', status = 'old', &
            form = 'formatted', err = 9999)
    READ(99, *, end = 9998)  alpha_r
    READ(99, *, end = 9998)  alpha_s
    READ(99, *, end = 9998)  R_r
    READ(99, *, end = 9998)  R_s
    READ(99, *, end = 9998)  frac_fine_scav
    READ(99, *, end = 9998)  frac_coar_scav
    READ(99, *, end = 9998)  frac_aer
    9998  CONTINUE
    CLOSE(99)
    9999  CONTINUE

    PRINT*, 'alpha_r', alpha_r
    PRINT*, 'alpha_s', alpha_s
    PRINT*, 'R_r', R_r
    PRINT*, 'R_s', R_s
    PRINT*, 'frac_fine_scav', frac_fine_scav
    PRINT*, 'frac_coar_scav', frac_coar_scav
    PRINT*, 'frac_aer ev', frac_aer

  ENDIF !(debut)
  !!!!!!!!!!!!!!!!!!!!!!!!!!!

  ! initialization
  dxin = 0.
  dxev = 0.
  beta_ev = 0.

  DO i = 1, klon
    his_dh(i) = 0.
  ENDDO

  DO k = 1, klev
    DO i = 1, klon
      dxbc(i, k) = 0.
      beta_v1(i, k) = 0.
      deltaP(i, k) = 0.
    ENDDO
  ENDDO

  !  pressure and size of the layer
  DO k = klev, 1, -1
    DO i = 1, klon
      zrho(i, k) = pplay(i, k) / t(i, k) / RD
      zdz(i, k) = (paprs(i, k) - paprs(i, k + 1)) / zrho(i, k) / RG
      zmass(i, k) = (paprs(i, k) - paprs(i, k + 1)) / RG
    ENDDO
  ENDDO

  !jyg<
  !! Temporary correction: all non-aerosol tracers are dealt with in the same way.
  !! Should be updated once it has been decided how gases should be dealt with.
  IF (aerosol(it)) THEN
    frac_ev = frac_aer
  ELSE                                                !  gas
    frac_ev = frac_gas
  ENDIF

  !jyg<
  IF (aerosol(it)) THEN ! aerosol
    DO k = 1, klev
      DO i = 1, klon
        scav(i, k) = frac_fine_scav
      ENDDO
    ENDDO
  ELSE                  ! gas
    DO k = 1, klev
      DO i = 1, klon
        henry_t = henry * exp(-kk * (1. / 298. - 1. / t(i, k)))    !  mol/l/atm
        f_a = henry_t / 101.325 * R * t(i, k) * oliq * zrho(i, k) / rho_water
        scav(i, k) = f_a / (1. + f_a)
      ENDDO
    ENDDO
  ENDIF

  DO k = klev - 1, 1, -1
    DO i = 1, klon
      !  incloud scavenging
      IF (iflag_lscav == 4) THEN
        beta = beta_fisrt(i, k) * rneb(i, k)
      ELSE
        beta = flxr(i, k) - flxr(i, k + 1) + flxs(i, k) - flxs(i, k + 1)
        beta = beta / zmass(i, k) / oliq
        beta = MAX(0., beta)
      ENDIF ! (iflag_lscav .EQ. 4)
      beta_v1(i, k) = beta    !! for output

      dxin = tr_seri(i, k, it) * (exp(-scav(i, k) * beta * pdtime) - 1.)
      his_dh(i) = his_dh(i) - dxin * zmass(i, k) / pdtime !  kg/m2/s
      d_tr_insc(i, k, it) = dxin                     !  kg/kg/timestep

      !  below-cloud impaction
      !jyg<
      IF (.NOT.aerosol(it)) THEN
        d_tr_bcscav(i, k, it) = 0.
      ELSE
        pr = 0.5 * (flxr(i, k) + flxr(i, k + 1))
        ps = 0.5 * (flxs(i, k) + flxs(i, k + 1))
        water = pr * alpha_r / R_r / rho_water
        ice = ps * alpha_s / R_s / rho_ice
        dxbc(i, k) = -3. / 4. * tr_seri(i, k, it) * pdtime * (water + ice)
        !      add tracers from below cloud scav in his_dh
        his_dh(i) = his_dh(i) - dxbc(i, k) * zmass(i, k) / pdtime !  kg/m2/s
        d_tr_bcscav(i, k, it) = dxbc(i, k)                   !  kg/kg/timestep
      ENDIF

      !  reevaporation
      deltaP(i, k) = flxr(i, k + 1) + flxs(i, k + 1) - flxr(i, k) - flxs(i, k)
      deltaP(i, k) = max(deltaP(i, k), 0.)

      IF (flxr(i, k + 1) + flxs(i, k + 1)>1.e-16) THEn
        beta_ev(i, k) = deltaP(i, k) / (flxr(i, k + 1) + flxs(i, k + 1))
      ELSE
        beta_ev(i, k) = 0.
      ENDIF

      beta_ev(i, k) = max(min(1., beta_ev(i, k)), 0.)

      !jyg
      IF (ABS(1. - (1. - frac_ev) * beta_ev(i, k))>1.e-16) THEN
        ! remove tracers from precipitation owing to release by evaporation in his_dh
        dxev = frac_ev * beta_ev(i, k) * his_dh(i) * pdtime / zmass(i, k) / (1. - (1. - frac_ev) * beta_ev(i, k))
        his_dh(i) = his_dh(i) * (1. - frac_ev * beta_ev(i, k) / (1. - (1. - frac_ev) * beta_ev(i, k)))
      ELSE
        dxev = his_dh(i) * pdtime / zmass(i, k)
        his_dh(i) = 0.
      ENDIF

      !      PRINT*,  k, 'beta_ev',beta_ev
      ! remove tracers from precipitation owing to release by evaporation in his_dh
      !      dxev=frac_ev*deltaP(i,k)*pdtime * his_dh(i) /(zrho(i,k)*zdz(i,k))
      !rplmd
      !      dxev=frac_ev*deltaP(i,k)*his_dh(i) *pdtime/(zrho(i,k)*zdz(i,k))/max(flxr(i,k)+flxs(i,k),1.e-16)

      d_tr_evap(i, k, it) = dxev       !  kg/kg/timestep

    ENDDO
  ENDDO

  DO i = 1, klon
    qPrls(i, it) = his_dh(i) / max(flxr(i, 1) + flxs(i, 1), 1.e-16)
  ENDDO

  ! test de conservation
  !      conserv=0.
  !      DO k= klev,1,-1
  !        DO i=1, klon
  !         conserv=conserv+d_tr_insc(i,k,it)*(paprs(i,k)-paprs(i,k+1))/RG &
  !                +d_tr_bcscav(i,k,it)*(paprs(i,k)-paprs(i,k+1))/RG  &
  !                +d_tr_evap(i,k,it)*(paprs(i,k)-paprs(i,k+1))/RG
  !      IF(it.EQ.3) WRITE(*,'(I2,2X,a,e20.12,2X,a,e20.12,2X,a,e20.12,2X,a,e20.12)'),&
  !      k,'lsc conserv ',conserv,'insc',d_tr_insc(i,k,it),'bc',d_tr_bcscav(i,k,it),'ev',d_tr_evap(i,k,it)
  !       ENDDO
  !     ENDDO

END SUBROUTINE lsc_scav