MODULE zdfiwm
!!========================================================================
!! *** MODULE zdfiwm ***
!! Ocean physics: Internal gravity wave-driven vertical mixing
!!========================================================================
!! History : 1.0 ! 2004-04 (L. Bessieres, G. Madec) Original code
!! - ! 2006-08 (A. Koch-Larrouy) Indonesian strait
!! 3.3 ! 2010-10 (C. Ethe, G. Madec) reorganisation of initialisation phase
!! 3.6 ! 2016-03 (C. de Lavergne) New param: internal wave-driven mixing
!! 4.0 ! 2017-04 (G. Madec) renamed module, remove the old param. and the CPP keys
!! 4.0 ! 2020-12 (C. de Lavergne) Update param to match published one
!! 4.0 ! 2021-09 (C. de Lavergne) Add energy from trapped and shallow internal tides
!!----------------------------------------------------------------------
!!----------------------------------------------------------------------
!! zdf_iwm : global momentum & tracer Kz with wave induced Kz
!! zdf_iwm_init : global momentum & tracer Kz with wave induced Kz
!!----------------------------------------------------------------------
USE oce ! ocean dynamics and tracers variables
USE dom_oce ! ocean space and time domain variables
USE zdf_oce ! ocean vertical physics variables
USE zdfddm ! ocean vertical physics: double diffusive mixing
USE lbclnk ! ocean lateral boundary conditions (or mpp link)
USE eosbn2 ! ocean equation of state
USE phycst ! physical constants
!
USE fldread ! field read
USE prtctl ! Print control
USE in_out_manager ! I/O manager
USE iom ! I/O Manager
USE lib_mpp ! MPP library
USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined)
IMPLICIT NONE
PRIVATE
PUBLIC zdf_iwm ! called in step module
PUBLIC zdf_iwm_init ! called in nemogcm module
! !!* Namelist namzdf_iwm : internal wave-driven mixing *
LOGICAL :: ln_mevar ! variable (=T) or constant (=F) mixing efficiency
LOGICAL :: ln_tsdiff ! account for differential T/S wave-driven mixing (=T) or not (=F)
REAL(wp):: r1_6 = 1._wp / 6._wp
REAL(wp):: rnu = 1.4e-6_wp ! molecular kinematic viscosity
REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: ebot_iwm ! bottom-intensified dissipation above abyssal hills (W/m2)
REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: ecri_iwm ! bottom-intensified dissipation at topographic slopes (W/m2)
REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: ensq_iwm ! dissipation scaling with squared buoyancy frequency (W/m2)
REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: esho_iwm ! dissipation due to shoaling internal tides (W/m2)
REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: hbot_iwm ! decay scale for abyssal hill dissipation (m)
REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: hcri_iwm ! inverse decay scale for topographic slope dissipation (m-1)
!! * Substitutions
# include "do_loop_substitute.h90"
# include "single_precision_substitute.h90"
# include "domzgr_substitute.h90"
!!----------------------------------------------------------------------
!! NEMO/OCE 4.0 , NEMO Consortium (2018)
!! $Id: zdfiwm.F90 15533 2021-11-24 12:07:20Z cdllod $
!! Software governed by the CeCILL license (see ./LICENSE)
!!----------------------------------------------------------------------
CONTAINS
INTEGER FUNCTION zdf_iwm_alloc()
!!----------------------------------------------------------------------
!! *** FUNCTION zdf_iwm_alloc ***
!!----------------------------------------------------------------------
ALLOCATE( ebot_iwm(jpi,jpj), ecri_iwm(jpi,jpj), ensq_iwm(jpi,jpj) , &
& esho_iwm(jpi,jpj), hbot_iwm(jpi,jpj), hcri_iwm(jpi,jpj) , STAT=zdf_iwm_alloc )
!
CALL mpp_sum ( 'zdfiwm', zdf_iwm_alloc )
IF( zdf_iwm_alloc /= 0 ) CALL ctl_stop( 'STOP', 'zdf_iwm_alloc: failed to allocate arrays' )
END FUNCTION zdf_iwm_alloc
SUBROUTINE zdf_iwm( kt, Kmm, p_avm, p_avt, p_avs )
!!----------------------------------------------------------------------
!! *** ROUTINE zdf_iwm ***
!!
!! ** Purpose : add to the vertical mixing coefficients the effect of
!! breaking internal waves.
!!
!! ** Method : - internal wave-driven vertical mixing is given by:
!! Kz_wave = min( f( Reb = zemx_iwm / (Nu * N^2) ), 100 cm2/s )
!! where zemx_iwm is the 3D space distribution of the wave-breaking
!! energy and Nu the molecular kinematic viscosity.
!! The function f(Reb) is linear (constant mixing efficiency)
!! if the namelist parameter ln_mevar = F and nonlinear if ln_mevar = T.
!!
!! - Compute zemx_iwm, the 3D power density that allows to compute
!! Reb and therefrom the wave-induced vertical diffusivity.
!! This is divided into four components:
!! 1. Bottom-intensified dissipation at topographic slopes, expressed
!! as an exponential decay above the bottom.
!! zemx_iwm(z) = ( ecri_iwm / rho0 ) * EXP( -(H-z)/hcri_iwm )
!! / ( 1. - EXP( - H/hcri_iwm ) ) * hcri_iwm
!! where hcri_iwm is the characteristic length scale of the bottom
!! intensification, ecri_iwm a static 2D map of available power, and
!! H the ocean depth.
!! 2. Bottom-intensified dissipation above abyssal hills, expressed
!! as an algebraic decay above bottom.
!! zemx_iwm(z) = ( ebot_iwm / rho0 ) * ( 1 + hbot_iwm/H )
!! / ( 1 + (H-z)/hbot_iwm )^2
!! where hbot_iwm is the characteristic length scale of the bottom
!! intensification and ebot_iwm is a static 2D map of available power.
!! 3. Dissipation scaling in the vertical with the squared buoyancy
!! frequency (N^2).
!! zemx_iwm(z) = ( ensq_iwm / rho0 ) * rn2(z)
!! / ZSUM( rn2 * e3w )
!! where ensq_iwm is a static 2D map of available power.
!! 4. Dissipation due to shoaling internal tides, scaling in the
!! vertical with the buoyancy frequency (N).
!! zemx_iwm(z) = ( esho_iwm / rho0 ) * sqrt(rn2(z))
!! / ZSUM( sqrt(rn2) * e3w )
!! where esho_iwm is a static 2D map of available power.
!!
!! - update the model vertical eddy viscosity and diffusivity:
!! avt = avt + av_wave
!! avs = avs + av_wave
!! avm = avm + av_wave
!!
!! - if namelist parameter ln_tsdiff = T, account for differential mixing:
!! avs = avs + av_wave * diffusivity_ratio(Reb)
!!
!! ** Action : - avt, avs, avm, increased by internal wave-driven mixing
!!
!! References : de Lavergne et al. JAMES 2020, https://doi.org/10.1029/2020MS002065
!! de Lavergne et al. JPO 2016, https://doi.org/10.1175/JPO-D-14-0259.1
!!----------------------------------------------------------------------
INTEGER , INTENT(in ) :: kt ! ocean time step
INTEGER , INTENT(in ) :: Kmm ! time level index
REAL(wp), DIMENSION(:,:,:) , INTENT(inout) :: p_avm ! momentum Kz (w-points)
REAL(wp), DIMENSION(:,:,:) , INTENT(inout) :: p_avt, p_avs ! tracer Kz (w-points)
!
INTEGER :: ji, jj, jk ! dummy loop indices
REAL(wp), SAVE :: zztmp
!
REAL(wp), DIMENSION(A2D(nn_hls)) :: zfact ! Used for vertical structure
REAL(wp), DIMENSION(A2D(nn_hls),jpk) :: zReb ! Turbulence intensity parameter
REAL(wp), DIMENSION(A2D(nn_hls),jpk) :: zemx_iwm ! local energy density available for mixing (W/kg)
REAL(wp), DIMENSION(A2D(nn_hls),jpk) :: zav_ratio ! S/T diffusivity ratio (only for ln_tsdiff=T)
REAL(wp), DIMENSION(A2D(nn_hls),jpk) :: zav_wave ! Internal wave-induced diffusivity
REAL(wp), ALLOCATABLE, DIMENSION(:,:,:) :: z3d ! 3D workspace used for iom_put
REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: z2d ! 2D - - - -
!!----------------------------------------------------------------------
!
! !* Initialize appropriately certain variables
DO_3D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1, 1, jpk )
zav_ratio(ji,jj,jk) = 1._wp * wmask(ji,jj,jk) ! important to set it to 1 here
END_3D
IF( iom_use("emix_iwm") ) zemx_iwm (:,:,:) = 0._wp
IF( iom_use("av_wave") .OR. sn_cfctl%l_prtctl ) zav_wave (:,:,:) = 0._wp
!
! ! ----------------------------- !
! ! Internal wave-driven mixing ! (compute zav_wave)
! ! ----------------------------- !
!
! !* 'cri' component: distribute energy over the time-varying
! !* ocean depth using an exponential decay from the seafloor.
DO_2D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1 ) ! part independent of the level
IF( ht(ji,jj) /= 0._wp ) THEN ; zfact(ji,jj) = ecri_iwm(ji,jj) * r1_rho0 / ( 1._wp - EXP( -ht(ji,jj) * hcri_iwm(ji,jj) ) )
ELSE ; zfact(ji,jj) = 0._wp
ENDIF
END_2D
DO_3D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1, 2, jpkm1 ) ! complete with the level-dependent part
zemx_iwm(ji,jj,jk) = zfact(ji,jj) * ( EXP( ( gdept(ji,jj,jk ,Kmm) - ht(ji,jj) ) * hcri_iwm(ji,jj) ) &
& - EXP( ( gdept(ji,jj,jk-1,Kmm) - ht(ji,jj) ) * hcri_iwm(ji,jj) ) &
& ) * wmask(ji,jj,jk) / e3w(ji,jj,jk,Kmm)
END_3D
!* 'bot' component: distribute energy over the time-varying
!* ocean depth using an algebraic decay above the seafloor.
DO_2D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1 ) ! part independent of the level
IF( ht(ji,jj) /= 0._wp ) THEN ; zfact(ji,jj) = ebot_iwm(ji,jj) * ( 1._wp + hbot_iwm(ji,jj) / ht(ji,jj) ) * r1_rho0
ELSE ; zfact(ji,jj) = 0._wp
ENDIF
END_2D
DO_3D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1, 2, jpkm1 ) ! complete with the level-dependent part
zemx_iwm(ji,jj,jk) = zemx_iwm(ji,jj,jk) + &
& zfact(ji,jj) * ( 1._wp / ( 1._wp + ( ht(ji,jj) - gdept(ji,jj,jk ,Kmm) ) / hbot_iwm(ji,jj) ) &
& - 1._wp / ( 1._wp + ( ht(ji,jj) - gdept(ji,jj,jk-1,Kmm) ) / hbot_iwm(ji,jj) ) &
& ) * wmask(ji,jj,jk) / e3w(ji,jj,jk,Kmm)
END_3D
!* 'nsq' component: distribute energy over the time-varying
!* ocean depth as proportional to rn2
DO_2D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1 )
zfact(ji,jj) = 0._wp
END_2D
DO_3D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1, 2, jpkm1 ) ! part independent of the level
zfact(ji,jj) = zfact(ji,jj) + e3w(ji,jj,jk,Kmm) * MAX( 0._wp, rn2(ji,jj,jk) )
END_3D
!
DO_2D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1 )
IF( zfact(ji,jj) /= 0._wp ) zfact(ji,jj) = ensq_iwm(ji,jj) * r1_rho0 / zfact(ji,jj)
END_2D
!
DO_3D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1, 2, jpkm1 ) ! complete with the level-dependent part
zemx_iwm(ji,jj,jk) = zemx_iwm(ji,jj,jk) + zfact(ji,jj) * MAX( 0._wp, rn2(ji,jj,jk) )
END_3D
!* 'sho' component: distribute energy over the time-varying
!* ocean depth as proportional to sqrt(rn2)
DO_2D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1 )
zfact(ji,jj) = 0._wp
END_2D
DO_3D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1, 2, jpkm1 ) ! part independent of the level
zfact(ji,jj) = zfact(ji,jj) + e3w(ji,jj,jk,Kmm) * SQRT( MAX( 0._wp, rn2(ji,jj,jk) ) )
END_3D
!
DO_2D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1 )
IF( zfact(ji,jj) /= 0._wp ) zfact(ji,jj) = esho_iwm(ji,jj) * r1_rho0 / zfact(ji,jj)
END_2D
!
DO_3D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1, 2, jpkm1 ) ! complete with the level-dependent part
zemx_iwm(ji,jj,jk) = zemx_iwm(ji,jj,jk) + zfact(ji,jj) * SQRT( MAX( 0._wp, rn2(ji,jj,jk) ) )
END_3D
! Calculate turbulence intensity parameter Reb
DO_3D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1, 2, jpkm1 )
zReb(ji,jj,jk) = zemx_iwm(ji,jj,jk) / MAX( 1.e-20_wp, rnu * rn2(ji,jj,jk) )
END_3D
!
! Define internal wave-induced diffusivity
DO_3D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1, 2, jpkm1 )
zav_wave(ji,jj,jk) = zReb(ji,jj,jk) * r1_6 * rnu ! This corresponds to a constant mixing efficiency of 1/6
END_3D
!
IF( ln_mevar ) THEN ! Variable mixing efficiency case : modify zav_wave in the
DO_3D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1, 2, jpkm1 ) ! energetic (Reb > 480) and buoyancy-controlled (Reb <10.224) regimes
IF( zReb(ji,jj,jk) > 480.00_wp ) THEN
zav_wave(ji,jj,jk) = 3.6515_wp * rnu * SQRT( zReb(ji,jj,jk) )
ELSEIF( zReb(ji,jj,jk) < 10.224_wp ) THEN
zav_wave(ji,jj,jk) = 0.052125_wp * rnu * zReb(ji,jj,jk) * SQRT( zReb(ji,jj,jk) )
ENDIF
END_3D
ENDIF
!
DO_3D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1, 2, jpkm1 ) ! Bound diffusivity by molecular value and 100 cm2/s
zav_wave(ji,jj,jk) = MIN( MAX( 1.4e-7_wp, zav_wave(ji,jj,jk) ), 1.e-2_wp ) * wmask(ji,jj,jk)
END_3D
!
! ! ----------------------- !
! ! Update mixing coefs !
! ! ----------------------- !
!
IF( ln_tsdiff ) THEN !* Option for differential mixing of salinity and temperature
DO_3D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1, 2, jpkm1 ) ! Calculate S/T diffusivity ratio as a function of Reb (else it is set to 1)
zav_ratio(ji,jj,jk) = ( 0.505_wp + &
& 0.495_wp * TANH( 0.92_wp * ( LOG10( MAX( 1.e-20, zReb(ji,jj,jk) * 5._wp * r1_6 ) ) - 0.60_wp ) ) &
& ) * wmask(ji,jj,jk)
END_3D
ENDIF
CALL iom_put( "av_ratio", zav_ratio )
!
DO_3D_OVR( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1, 2, jpkm1 ) !* update momentum & tracer diffusivity with wave-driven mixing
p_avs(ji,jj,jk) = p_avs(ji,jj,jk) + zav_wave(ji,jj,jk) * zav_ratio(ji,jj,jk)
p_avt(ji,jj,jk) = p_avt(ji,jj,jk) + zav_wave(ji,jj,jk)
p_avm(ji,jj,jk) = p_avm(ji,jj,jk) + zav_wave(ji,jj,jk)
END_3D
! !* output internal wave-driven mixing coefficient
CALL iom_put( "av_wave", zav_wave )
!* output useful diagnostics: Kz*N^2 ,
! vertical integral of rho0 * Kz * N^2 , energy density (zemx_iwm)
IF( iom_use("bflx_iwm") .OR. iom_use("pcmap_iwm") ) THEN
ALLOCATE( z2d(A2D(nn_hls)) , z3d(A2D(nn_hls),jpk) )
z2d(:,:) = 0._wp ; z3d(:,:,:) = 0._wp ! Initialisation for iom_put
DO_3D( 0, 0, 0, 0, 2, jpkm1 )
z3d(ji,jj,jk) = MAX( 0._wp, rn2(ji,jj,jk) ) * zav_wave(ji,jj,jk)
z2d(ji,jj) = z2d(ji,jj) + rho0 * e3w(ji,jj,jk,Kmm) * z3d(ji,jj,jk) * wmask(ji,jj,jk)
END_3D
CALL iom_put( "bflx_iwm", z3d )
CALL iom_put( "pcmap_iwm", z2d )
DEALLOCATE( z2d , z3d )
ENDIF
CALL iom_put( "emix_iwm", zemx_iwm )
!
IF( kt == nit000 ) THEN !* Control print at first time-step: diagnose the energy consumed by zav_wave
IF( .NOT. l_istiled .OR. ntile == 1 ) zztmp = 0._wp ! Do only on the first tile
DO_3D( 0, 0, 0, 0, 2, jpkm1 )
zztmp = zztmp + e3w(ji,jj,jk,Kmm) * e1e2t(ji,jj) &
& * MAX( 0._wp, rn2(ji,jj,jk) ) * zav_wave(ji,jj,jk) * wmask(ji,jj,jk) * tmask_i(ji,jj)
END_3D
IF( .NOT. l_istiled .OR. ntile == nijtile ) THEN ! Do only on the last tile
CALL mpp_sum( 'zdfiwm', zztmp )
zztmp = rho0 * zztmp ! Global integral of rho0 * Kz * N^2 = power contributing to mixing
!
IF(lwp) THEN
WRITE(numout,*)
WRITE(numout,*) 'zdf_iwm : Internal wave-driven mixing (iwm)'
WRITE(numout,*) '~~~~~~~ '
WRITE(numout,*)
WRITE(numout,*) ' Total power consumption by av_wave = ', zztmp * 1.e-12_wp, 'TW'
ENDIF
ENDIF
ENDIF
IF(sn_cfctl%l_prtctl) CALL prt_ctl(tab3d_1=CASTDP(zav_wave) , clinfo1=' iwm - av_wave: ', tab3d_2=CASTDP(avt), clinfo2=' avt: ')
!
END SUBROUTINE zdf_iwm
SUBROUTINE zdf_iwm_init
!!----------------------------------------------------------------------
!! *** ROUTINE zdf_iwm_init ***
!!
!! ** Purpose : Initialization of the internal wave-driven vertical mixing, reading
!! of input power maps and decay length scales in a netcdf file.
!!
!! ** Method : - Read the namzdf_iwm namelist and check the parameters
!!
!! - Read the input data in a NetCDF file (zdfiwm_forcing.nc) with variables:
!! 'power_bot' bottom-intensified dissipation above abyssal hills
!! 'power_cri' bottom-intensified dissipation at topographic slopes
!! 'power_nsq' dissipation scaling with squared buoyancy frequency
!! 'power_sho' dissipation due to shoaling internal tides
!! 'scale_bot' decay scale for abyssal hill dissipation
!! 'scale_cri' decay scale for topographic-slope dissipation
!!
!! ** input : - Namlist namzdf_iwm
!! - NetCDF file : zdfiwm_forcing.nc
!!
!! ** Action : - Increase by 1 the nstop flag is setting problem encounter
!! - Define ebot_iwm, ecri_iwm, ensq_iwm, esho_iwm, hbot_iwm, hcri_iwm
!!
!! References : de Lavergne et al. JAMES 2020, https://doi.org/10.1029/2020MS002065
!!----------------------------------------------------------------------
INTEGER :: ifpr ! dummy loop indices
INTEGER :: inum ! local integer
INTEGER :: ios
!
CHARACTER(len=256) :: cn_dir ! Root directory for location of ssr files
INTEGER, PARAMETER :: jpiwm = 6 ! maximum number of variables to read
INTEGER, PARAMETER :: jp_mpb = 1
INTEGER, PARAMETER :: jp_mpc = 2
INTEGER, PARAMETER :: jp_mpn = 3
INTEGER, PARAMETER :: jp_mps = 4
INTEGER, PARAMETER :: jp_dsb = 5
INTEGER, PARAMETER :: jp_dsc = 6
!
TYPE(FLD_N), DIMENSION(jpiwm) :: slf_iwm ! array of namelist informations
TYPE(FLD_N) :: sn_mpb, sn_mpc, sn_mpn, sn_mps ! information about Mixing Power field to be read
TYPE(FLD_N) :: sn_dsb, sn_dsc ! information about Decay Scale field to be read
TYPE(FLD ), DIMENSION(jpiwm) :: sf_iwm ! structure of input fields (file informations, fields read)
!
REAL(wp), DIMENSION(jpi,jpj,4) :: ztmp
REAL(wp), DIMENSION(4) :: zdia
!
NAMELIST/namzdf_iwm/ ln_mevar, ln_tsdiff, &
& cn_dir, sn_mpb, sn_mpc, sn_mpn, sn_mps, sn_dsb, sn_dsc
!!----------------------------------------------------------------------
!
READ ( numnam_ref, namzdf_iwm, IOSTAT = ios, ERR = 901)
901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namzdf_iwm in reference namelist' )
!
READ ( numnam_cfg, namzdf_iwm, IOSTAT = ios, ERR = 902 )
902 IF( ios > 0 ) CALL ctl_nam ( ios , 'namzdf_iwm in configuration namelist' )
IF(lwm) WRITE ( numond, namzdf_iwm )
!
IF(lwp) THEN ! Control print
WRITE(numout,*)
WRITE(numout,*) 'zdf_iwm_init : internal wave-driven mixing'
WRITE(numout,*) '~~~~~~~~~~~~'
WRITE(numout,*) ' Namelist namzdf_iwm : set wave-driven mixing parameters'
WRITE(numout,*) ' Variable (T) or constant (F) mixing efficiency = ', ln_mevar
WRITE(numout,*) ' Differential internal wave-driven mixing (T) or not (F) = ', ln_tsdiff
ENDIF
! This internal-wave-driven mixing parameterization elevates avt and avm in the interior, and
! ensures that avt remains larger than its molecular value (=1.4e-7). Therefore, avtb should
! be set here to a very small value, and avmb to its (uniform) molecular value (=1.4e-6).
avmb(:) = rnu ! molecular value
avtb(:) = 1.e-10_wp ! very small diffusive minimum (background avt is specified in zdf_iwm)
avtb_2d(:,:) = 1._wp ! uniform
IF(lwp) THEN ! Control print
WRITE(numout,*)
WRITE(numout,*) ' Force the background value applied to avm & avt in TKE to be everywhere ', &
& 'the viscous molecular value & a very small diffusive value, resp.'
ENDIF
! ! allocate iwm arrays
IF( zdf_iwm_alloc() /= 0 ) CALL ctl_stop( 'STOP', 'zdf_iwm_init : unable to allocate iwm arrays' )
!
! store namelist information in an array
slf_iwm(jp_mpb) = sn_mpb ; slf_iwm(jp_mpc) = sn_mpc ; slf_iwm(jp_mpn) = sn_mpn ; slf_iwm(jp_mps) = sn_mps
slf_iwm(jp_dsb) = sn_dsb ; slf_iwm(jp_dsc) = sn_dsc
!
DO ifpr= 1, jpiwm
ALLOCATE( sf_iwm(ifpr)%fnow(jpi,jpj,1) )
IF( slf_iwm(ifpr)%ln_tint ) ALLOCATE( sf_iwm(ifpr)%fdta(jpi,jpj,1,2) )
END DO
! fill sf_iwm with sf_iwm and control print
CALL fld_fill( sf_iwm, slf_iwm , cn_dir, 'zdfiwm_init', 'iwm input file', 'namiwm' )
! ! hard-coded default values
sf_iwm(jp_mpb)%fnow(:,:,1) = 1.e-10_wp
sf_iwm(jp_mpc)%fnow(:,:,1) = 1.e-10_wp
sf_iwm(jp_mpn)%fnow(:,:,1) = 1.e-5_wp
sf_iwm(jp_mps)%fnow(:,:,1) = 1.e-10_wp
sf_iwm(jp_dsb)%fnow(:,:,1) = 100._wp
sf_iwm(jp_dsc)%fnow(:,:,1) = 100._wp
! ! read necessary fields
CALL fld_read( nit000, 1, sf_iwm )
ebot_iwm(:,:) = sf_iwm(1)%fnow(:,:,1) * ssmask(:,:) ! energy flux for dissipation above abyssal hills [W/m2]
ecri_iwm(:,:) = sf_iwm(2)%fnow(:,:,1) * ssmask(:,:) ! energy flux for dissipation at topographic slopes [W/m2]
ensq_iwm(:,:) = sf_iwm(3)%fnow(:,:,1) * ssmask(:,:) ! energy flux for dissipation scaling with N^2 [W/m2]
esho_iwm(:,:) = sf_iwm(4)%fnow(:,:,1) * ssmask(:,:) ! energy flux for dissipation due to shoaling [W/m2]
hbot_iwm(:,:) = sf_iwm(5)%fnow(:,:,1) ! spatially variable decay scale for abyssal hill dissipation [m]
hcri_iwm(:,:) = sf_iwm(6)%fnow(:,:,1) ! spatially variable decay scale for topographic-slope [m]
hcri_iwm(:,:) = 1._wp / hcri_iwm(:,:) ! only the inverse height is used, hence calculated here once for all
! diags
ztmp(:,:,1) = e1e2t(:,:) * ebot_iwm(:,:)
ztmp(:,:,2) = e1e2t(:,:) * ecri_iwm(:,:)
ztmp(:,:,3) = e1e2t(:,:) * ensq_iwm(:,:)
ztmp(:,:,4) = e1e2t(:,:) * esho_iwm(:,:)
zdia(1:4) =glob_sum_vec( 'zdfiwm', CASTDP(ztmp(:,:,1:4)) )
IF(lwp) THEN
WRITE(numout,*) ' Dissipation above abyssal hills: ', zdia(1) * 1.e-12_wp, 'TW'
WRITE(numout,*) ' Dissipation along topographic slopes: ', zdia(2) * 1.e-12_wp, 'TW'
WRITE(numout,*) ' Dissipation scaling with N^2: ', zdia(3) * 1.e-12_wp, 'TW'
WRITE(numout,*) ' Dissipation due to shoaling: ', zdia(4) * 1.e-12_wp, 'TW'
ENDIF
!
END SUBROUTINE zdf_iwm_init
!!======================================================================
END MODULE zdfiwm