coupling_watflux_sbln.F90

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!SFX_LIC Copyright 1994-2014 CNRS, Meteo-France and Universite Paul Sabatier
!SFX_LIC This is part of the SURFEX software governed by the CeCILL-C licence
!SFX_LIC version 1. See LICENSE, CeCILL-C_V1-en.txt and CeCILL-C_V1-fr.txt  
!SFX_LIC for details. version 1.
!     ###############################################################################
SUBROUTINE coupling_watflux_sbl_n (SB, CHW, DGO, D, DC, W, DST, SLT, &
                                   HPROGRAM, HCOUPLING,  PTIMEC, PTSTEP, KYEAR, KMONTH, KDAY, PTIME, &
                                   KI, KSV, KSW, PTSUN, PZENITH, PZENITH2, PAZIM, PZREF, PUREF, PU, PV, &
                                   PQA, PTA, PRHOA, PSV, PCO2, HSV,PRAIN, PSNOW, PLW, PDIR_SW, PSCA_SW, &
                                   PSW_BANDS, PPS, PPA, PSFTQ, PSFTH, PSFTS, PSFCO2, PSFU, PSFV, &
                                   PTRAD, PDIR_ALB, PSCA_ALB, PEMIS, PTSURF, PZ0, PZ0H, PQSURF, &
                                   PPEW_A_COEF, PPEW_B_COEF, PPET_A_COEF, PPEQ_A_COEF, PPET_B_COEF, &
                                   PPEQ_B_COEF, HTEST                                             )
!     ###############################################################################
!
!!****  *COUPLING_WATFLUX_SBL_n * - Adds a SBL into SEAFLUX
!!
!!    PURPOSE
!!    -------
!
!!**  METHOD
!!    ------
!!
!!    REFERENCE
!!    ---------
!!      
!!
!!    AUTHOR
!!    ------
!!     V. Masson 
!!
!!    MODIFICATIONS
!!    -------------
!!      Original    09/2007
!!      V. Masson   05/2009 Implicitation of momentum fluxes
!!      S. Riette   06/2009 Initialisation of XT, PQ, XU and XTKE on canopy levels
!!      S. Riette   10/2009 Iterative computation of XZ0
!!      S. Riette   01/2010 Use of interpol_sbl to compute 10m wind diagnostic
!!      B. Decharme  04/2013 new coupling variables
!----------------------------------------------------------------
!
!
USE modd_canopy_n, ONLY : canopy_t
USE modd_ch_watflux_n, ONLY : ch_watflux_t
USE modd_diag_n, ONLY : diag_options_t, diag_t
USE modd_watflux_n, ONLY : watflux_t
!
USE modd_dst_n, ONLY : dst_t
USE modd_slt_n, ONLY : slt_t
!
USE modd_surf_par,         ONLY : xundef
USE modd_csts,             ONLY : xcpd
! 
USE mode_coupling_canopy
!
USE modi_init_water_sbl
!
USE modi_canopy_evol
USE modi_canopy_grid_update
!
USE modi_coupling_watflux_n
!
USE yomhook   ,ONLY : lhook,   dr_hook
USE parkind1  ,ONLY : jprb
!
IMPLICIT NONE
!
!*      0.1    declarations of arguments
!
!
TYPE(canopy_t), INTENT(INOUT) :: SB
TYPE(ch_watflux_t), INTENT(INOUT) :: CHW
TYPE(diag_options_t), INTENT(INOUT) :: DGO
TYPE(diag_t), INTENT(INOUT) :: D 
TYPE(diag_t), INTENT(INOUT) :: DC
TYPE(watflux_t), INTENT(INOUT) :: W 
!
TYPE(dst_t), INTENT(INOUT) :: DST
TYPE(slt_t), INTENT(INOUT) :: SLT
!
 CHARACTER(LEN=6),    INTENT(IN)  :: HPROGRAM  ! program calling surf. schemes
 CHARACTER(LEN=1),    INTENT(IN)  :: HCOUPLING ! type of coupling
                                              ! 'E' : explicit
                                              ! 'I' : implicit
 REAL,                INTENT(IN)  :: PTIMEC    ! cumulated time since beginning of simulation
INTEGER,             INTENT(IN)  :: KYEAR     ! current year (UTC)
INTEGER,             INTENT(IN)  :: KMONTH    ! current month (UTC)
INTEGER,             INTENT(IN)  :: KDAY      ! current day (UTC)
REAL,                INTENT(IN)  :: PTIME     ! current time since midnight (UTC, s)
INTEGER,             INTENT(IN)  :: KI        ! number of points
INTEGER,             INTENT(IN)  :: KSV       ! number of scalars
INTEGER,             INTENT(IN)  :: KSW       ! number of short-wave spectral bands
REAL, DIMENSION(KI), INTENT(IN)  :: PTSUN     ! solar time                    (s from midnight)
REAL,                INTENT(IN)  :: PTSTEP    ! atmospheric time-step                 (s)
REAL, DIMENSION(KI), INTENT(IN)  :: PZREF     ! height of T,q forcing                 (m)
REAL, DIMENSION(KI), INTENT(IN)  :: PUREF     ! height of wind forcing                (m)
!
REAL, DIMENSION(KI), INTENT(IN)  :: PTA       ! air temperature forcing               (K)
REAL, DIMENSION(KI), INTENT(IN)  :: PQA       ! air humidity forcing                  (kg/m3)
REAL, DIMENSION(KI), INTENT(IN)  :: PRHOA     ! air density                           (kg/m3)
REAL, DIMENSION(KI,KSV),INTENT(IN) :: PSV     ! scalar variables
!                                             ! chemistry:   first char. in HSV: '#'  (molecule/m3)
!                                             !
 CHARACTER(LEN=6), DIMENSION(KSV),INTENT(IN):: HSV  ! name of all scalar variables
REAL, DIMENSION(KI), INTENT(IN)  :: PU        ! zonal wind                            (m/s)
REAL, DIMENSION(KI), INTENT(IN)  :: PV        ! meridian wind                         (m/s)
REAL, DIMENSION(KI,KSW),INTENT(IN) :: PDIR_SW ! direct  solar radiation (on horizontal surf.)
!                                             !                                       (W/m2)
REAL, DIMENSION(KI,KSW),INTENT(IN) :: PSCA_SW ! diffuse solar radiation (on horizontal surf.)
!                                             !                                       (W/m2)
REAL, DIMENSION(KSW),INTENT(IN)  :: PSW_BANDS ! mean wavelength of each shortwave band (m)
REAL, DIMENSION(KI), INTENT(IN)  :: PZENITH   ! zenithal angle at t  (radian from the vertical)
REAL, DIMENSION(KI), INTENT(IN)  :: PZENITH2  ! zenithal angle at t+1(radian from the vertical)
REAL, DIMENSION(KI), INTENT(IN)  :: PAZIM     ! azimuthal angle      (radian from North, clockwise)
REAL, DIMENSION(KI), INTENT(IN)  :: PLW       ! longwave radiation (on horizontal surf.)
!                                             !                                       (W/m2)
REAL, DIMENSION(KI), INTENT(IN)  :: PPS       ! pressure at atmospheric model surface (Pa)
REAL, DIMENSION(KI), INTENT(IN)  :: PPA       ! pressure at forcing level             (Pa)
REAL, DIMENSION(KI), INTENT(IN)  :: PCO2      ! CO2 concentration in the air          (kg/m3)
REAL, DIMENSION(KI), INTENT(IN)  :: PSNOW     ! snow precipitation                    (kg/m2/s)
REAL, DIMENSION(KI), INTENT(IN)  :: PRAIN     ! liquid precipitation                  (kg/m2/s)
!
!
REAL, DIMENSION(KI), INTENT(OUT) :: PSFTH     ! flux of heat                          (W/m2)
REAL, DIMENSION(KI), INTENT(OUT) :: PSFTQ     ! flux of water vapor                   (kg/m2/s)
REAL, DIMENSION(KI), INTENT(OUT) :: PSFU      ! zonal momentum flux                   (Pa)
REAL, DIMENSION(KI), INTENT(OUT) :: PSFV      ! meridian momentum flux                (Pa)
REAL, DIMENSION(KI), INTENT(OUT) :: PSFCO2    ! flux of CO2                           (m/s*kg_CO2/kg_air)
REAL, DIMENSION(KI,KSV),INTENT(OUT):: PSFTS   ! flux of scalar var.                   (kg/m2/s)
!
REAL, DIMENSION(KI), INTENT(OUT) :: PTRAD     ! radiative temperature                 (K)
REAL, DIMENSION(KI,KSW),INTENT(OUT):: PDIR_ALB! direct albedo for each spectral band  (-)
REAL, DIMENSION(KI,KSW),INTENT(OUT):: PSCA_ALB! diffuse albedo for each spectral band (-)
REAL, DIMENSION(KI), INTENT(OUT) :: PEMIS     ! emissivity                            (-)
!
REAL, DIMENSION(KI), INTENT(OUT) :: PTSURF    ! surface effective temperature         (K)
REAL, DIMENSION(KI), INTENT(OUT) :: PZ0       ! roughness length for momentum         (m)
REAL, DIMENSION(KI), INTENT(OUT) :: PZ0H      ! roughness length for heat             (m)
REAL, DIMENSION(KI), INTENT(OUT) :: PQSURF    ! specific humidity at surface          (kg/kg)
!
REAL, DIMENSION(KI), INTENT(IN) :: PPEW_A_COEF! implicit coefficients
REAL, DIMENSION(KI), INTENT(IN) :: PPEW_B_COEF! needed if HCOUPLING='I'
REAL, DIMENSION(KI), INTENT(IN) :: PPET_A_COEF
REAL, DIMENSION(KI), INTENT(IN) :: PPEQ_A_COEF
REAL, DIMENSION(KI), INTENT(IN) :: PPET_B_COEF
REAL, DIMENSION(KI), INTENT(IN) :: PPEQ_B_COEF
 CHARACTER(LEN=2),    INTENT(IN) :: HTEST ! must be equal to 'OK'
!
!*      0.2    declarations of local variables
!
!* forcing variables
!
REAL, DIMENSION(KI)     :: ZWIND    ! lowest atmospheric level wind speed           (m/s)
REAL, DIMENSION(KI)     :: ZEXNA    ! Exner function at lowest SBL scheme level     (-)
REAL, DIMENSION(KI)     :: ZTA      ! temperature                                   (K)
REAL, DIMENSION(KI)     :: ZPA      ! pressure                                      (Pa)
REAL, DIMENSION(KI)     :: ZZREF    ! temperature forcing level                     (m)
REAL, DIMENSION(KI)     :: ZUREF    ! wind        forcing level                     (m)
REAL, DIMENSION(KI)     :: ZU       ! zonal wind                                    (m/s)
REAL, DIMENSION(KI)     :: ZV       ! meridian wind                                 (m/s)
REAL, DIMENSION(KI)     :: ZQA      ! specific humidity                             (kg/m3)
REAL, DIMENSION(KI)     :: ZPEQ_A_COEF ! specific humidity implicit
REAL, DIMENSION(KI)     :: ZPEQ_B_COEF ! coefficients (hum. in kg/kg)
!
!
! SBL turbulence scheme
!
REAL, DIMENSION(KI)        :: ZSFLUX_U  ! Surface flux u'w' (m2/s2)
REAL, DIMENSION(KI)        :: ZSFLUX_T  ! Surface flux w'T' (mK/s)
REAL, DIMENSION(KI)        :: ZSFLUX_Q  ! Surface flux w'q' (kgm2/s)
REAL, DIMENSION(KI,SB%NLVL)   :: ZFORC_U   ! tendency due to drag force for wind
REAL, DIMENSION(KI,SB%NLVL)   :: ZDFORC_UDU! formal derivative of
!                                              ! tendency due to drag force for wind
REAL, DIMENSION(KI,SB%NLVL)   :: ZFORC_E   ! tendency due to drag force for TKE
REAL, DIMENSION(KI,SB%NLVL)   :: ZDFORC_EDE! formal derivative of
!                                              ! tendency due to drag force for TKE
REAL, DIMENSION(KI,SB%NLVL)   :: ZFORC_T   ! tendency due to drag force for Temp
REAL, DIMENSION(KI,SB%NLVL)   :: ZDFORC_TDT! formal derivative of
!                                              ! tendency due to drag force for Temp
REAL, DIMENSION(KI,SB%NLVL)   :: ZFORC_Q   ! tendency due to drag force for Temp
REAL, DIMENSION(KI,SB%NLVL)   :: ZDFORC_QDQ! formal derivative of
!                                              ! tendency due to drag force for hum.
REAL, DIMENSION(KI,SB%NLVL)   :: ZLM       ! mixing length
REAL, DIMENSION(KI,SB%NLVL)   :: ZLEPS     ! dissipative length
REAL, DIMENSION(KI)     :: ZH           ! canopy height (m)
REAL, DIMENSION(KI)     :: ZUSTAR       ! friction velocity (m/s)
!
REAL, DIMENSION(KI)     :: ZPET_A_COEF ! temperature implicit
REAL, DIMENSION(KI)     :: ZPET_B_COEF ! coefficients (K)
REAL, DIMENSION(KI)     :: ZPEW_A_COEF ! wind implicit
REAL, DIMENSION(KI)     :: ZPEW_B_COEF ! coefficients (m/s)

REAL, DIMENSION(KI)   :: ZALFAU   ! V+(1) = - alfa rho u'w'(1) + beta
REAL, DIMENSION(KI)   :: ZBETAU   ! V+(1) = - alfa rho u'w'(1) + beta
REAL, DIMENSION(KI)   :: ZALFATH  ! Th+(1) = - alfa rho w'th'(1) + beta
REAL, DIMENSION(KI)   :: ZBETATH  ! Th+(1) = - alfa rho w'th'(1) + beta
REAL, DIMENSION(KI)   :: ZALFAQ   ! Q+(1) = - alfa rho w'q'(1) + beta
REAL, DIMENSION(KI)   :: ZBETAQ   ! Q+(1) = - alfa rho w'q'(1) + beta
!
INTEGER :: JLAYER
 CHARACTER(LEN=1) :: GCOUPLING
REAL(KIND=JPRB) :: ZHOOK_HANDLE
!-------------------------------------------------------------------------------------
!
!
!*      1.     Preliminary computations of the SBL scheme
!              ------------------------------------------
!
IF (lhook) CALL dr_hook('COUPLING_WATFLUX_SBL_N',0,zhook_handle)
IF (w%LSBL) THEN
!
!*      1.1    Updates SBL vertical grid as a function of forcing height
!              ---------------------------------------------------------
!
!* determines where is the forcing level and modifies the upper levels of the canopy grid
!
  zh = 0.
  CALL canopy_grid_update(ki,zh,puref,sb)
!
!
!
!*     1.2     Initialisation at first time step
!              ---------------------------------
!
  IF(any(sb%XT(:,:) == xundef)) THEN
    CALL init_water_sbl(sb, ppa, pps, pta, pqa, prhoa, pu, pv, prain, psnow,  &
                        psfth, psftq, pzref, puref, w%XTS, w%XZ0)
  ENDIF
!
!
!*      1.3    Allocations
!              -----------
!
  CALL init_forc( zforc_u, zdforc_udu, zforc_e, zdforc_ede, &
                  zforc_t, zdforc_tdt, zforc_q, zdforc_qdq )
!
  zsflux_u = 0.
  zsflux_t = 0.
  zsflux_q = 0.
!
!*      1.3   Computes coefficients for implicitation
!             ---------------------------------------
!
  zwind = sqrt(pu**2+pv**2)
  CALL canopy_evol(sb,ki,ptstep,1,sb%XZ,zwind,pta,pqa,ppa,prhoa,   &
                   zsflux_u,zsflux_t,zsflux_q,zforc_u,zdforc_udu,&
                   zforc_e,zdforc_ede,zforc_t,zdforc_tdt,zforc_q,zdforc_qdq, &
                   zlm,zleps,zustar,zalfau,zbetau,zalfath,zbetath,zalfaq,zbetaq )

!
!*     1.5     Goes from atmospheric forcing to canopy forcing height
!              ------------------------------------------------------
!
  gcoupling = 'I'
!
  CALL init_coupling_canopy( sb, ppa, pu, pv,  &
                            prhoa, zalfau, zbetau, zalfath,   &
                            zbetath, zalfaq, zbetaq,          &
                            zpa, zta, zqa, zu, zv,            &
                            zuref, zzref, zexna,              &
                            zpew_a_coef, zpew_b_coef,         &
                            zpet_a_coef, zpet_b_coef,         &
                            zpeq_a_coef, zpeq_b_coef          )
!
!-------------------------------------------------------------------------------------
ELSE
!-------------------------------------------------------------------------------------
!
!*      2.     If no SBL scheme is used, forcing is not modified
!              -------------------------------------------------
!
  gcoupling = hcoupling
!
  CALL init_coupling( hcoupling,                  &
                      pps, ppa, pta, pqa, pu, pv, &
                      puref, pzref,               &
                      ppew_a_coef, ppew_b_coef,   &
                      ppet_a_coef, ppet_b_coef,   &
                      ppeq_a_coef, ppeq_b_coef,   &
                      zpa, zta, zqa, zu, zv,      &
                      zuref, zzref,               &
                      zpew_a_coef, zpew_b_coef,   &
                      zpet_a_coef, zpet_b_coef,   &
                      zpeq_a_coef, zpeq_b_coef    ) 
!
END IF
!
!-------------------------------------------------------------------------------------
!
!*      2.     Call of SEAFLUX
!              ------------
!
  CALL coupling_watflux_n(chw, dgo, d, dc, w, dst, slt, hprogram, gcoupling, ptimec,    &
                          ptstep, kyear, kmonth, kday, ptime, ki, ksv, ksw, ptsun, pzenith, &
                          pzenith2, pazim, zzref, zuref, zu, zv, zqa, zta, prhoa, psv, pco2,&
                          hsv, prain, psnow, plw, pdir_sw, psca_sw, psw_bands, pps, zpa,    &
                          psftq, psfth, psfts, psfco2, psfu, psfv, ptrad, pdir_alb, psca_alb,&
                          pemis, ptsurf, pz0, pz0h, pqsurf, zpew_a_coef, zpew_b_coef,       &
                          zpet_a_coef, zpeq_a_coef, zpet_b_coef, zpeq_b_coef,'OK'     )
!
!-------------------------------------------------------------------------------------
!
!*      3.     End if no SBL is used
!              ---------------------
!
IF (.NOT. w%LSBL .AND. lhook) CALL dr_hook('COUPLING_WATFLUX_SBL_N',1,zhook_handle)
IF (.NOT. w%LSBL) RETURN
!
!-------------------------------------------------------------------------------------
!
!*      4.     Computes the impact of canopy and surfaces on air
!              -------------------------------------------------
!
 CALL init_forc( zforc_u, zdforc_udu, zforc_e, zdforc_ede, &
                 zforc_t, zdforc_tdt, zforc_q, zdforc_qdq )
!
zsflux_u = - sqrt(psfu(:)**2+psfv(:)**2) / prhoa(:)
zsflux_t(:) = psfth(:) / xcpd * zexna(:) / prhoa(:)
zsflux_q(:) = psftq(:)
!
!-------------------------------------------------------------------------------------
!
!*      6.    Evolution of canopy air due to these impacts
!             --------------------------------------------
!
zwind = sqrt(pu**2+pv**2)
 CALL canopy_evol(sb,ki,ptstep,2,sb%XZ,zwind,pta,pqa,ppa,prhoa,  &
                  zsflux_u,zsflux_t,zsflux_q,zforc_u,zdforc_udu,   &
                  zforc_e,zdforc_ede,zforc_t,zdforc_tdt, &
                  zforc_q,zdforc_qdq,zlm,zleps,zustar,             &
                  zalfau,zbetau,zalfath,zbetath,zalfaq,zbetaq     )
!
DO jlayer=1,sb%NLVL-1
  sb%XLMO(:,jlayer) = sb%XLMO(:,sb%NLVL)
ENDDO
!
!-------------------------------------------------------------------------------------
!
!*      7.    2m and 10m diagnostics if canopy is used
!             ----------------------------------------
!
!
IF (w%LSBL .AND. dgo%N2M>=1) CALL init_2m_10m( sb, d, pu, pv, zwind, prhoa )
!
IF (lhook) CALL dr_hook('COUPLING_WATFLUX_SBL_N',1,zhook_handle)
!
!-------------------------------------------------------------------------------------
!
END SUBROUTINE coupling_watflux_sbl_n