MODULE zdfbfr !!====================================================================== !! *** MODULE zdfbfr *** !! Ocean physics: Bottom friction !!====================================================================== !! History : OPA ! 1997-06 (G. Madec, A.-M. Treguier) Original code !! NEMO 1.0 ! 2002-06 (G. Madec) F90: Free form and module !! 3.2 ! 2009-09 (A.C.Coward) Correction to include barotropic contribution !! 3.3 ! 2010-10 (C. Ethe, G. Madec) reorganisation of initialisation phase !! 3.4 ! 2011-11 (H. Liu) implementation of semi-implicit bottom friction option !! ! 2012-06 (H. Liu) implementation of Log Layer bottom friction option !!---------------------------------------------------------------------- !!---------------------------------------------------------------------- !! zdf_bfr : update bottom friction coefficient (non-linear bottom friction only) !! zdf_bfr_init : read in namelist and control the bottom friction parameters. !!---------------------------------------------------------------------- USE oce ! ocean dynamics and tracers variables USE dom_oce ! ocean space and time domain variables USE zdf_oce ! ocean vertical physics variables USE in_out_manager ! I/O manager USE lbclnk ! ocean lateral boundary conditions (or mpp link) USE lib_mpp ! distributed memory computing USE prtctl ! Print control USE timing ! Timing USE wrk_nemo ! Memory Allocation USE phycst, ONLY: vkarmn IMPLICIT NONE PRIVATE PUBLIC zdf_bfr ! called by step.F90 PUBLIC zdf_bfr_init ! called by nemogcm.F90 ! !!* Namelist nambfr: bottom friction namelist * INTEGER , PUBLIC :: nn_bfr ! = 0/1/2/3 type of bottom friction (PUBLIC for TAM) REAL(wp), PUBLIC :: rn_bfri1 ! bottom drag coefficient (linear case) (PUBLIC for TAM) REAL(wp), PUBLIC :: rn_bfri2 ! bottom drag coefficient (non linear case) (PUBLIC for TAM) REAL(wp), PUBLIC :: rn_bfri2_max ! Maximum bottom drag coefficient (non linear case and ln_loglayer=T) (PUBLIC for TAM) REAL(wp), PUBLIC :: rn_bfeb2 ! background bottom turbulent kinetic energy [m2/s2] (PUBLIC for TAM) REAL(wp), PUBLIC :: rn_bfrien ! local factor to enhance coefficient bfri (PUBLIC for TAM) LOGICAL , PUBLIC :: ln_bfr2d ! logical switch for 2D enhancement (PUBLIC for TAM) REAL(wp), PUBLIC :: rn_tfri1 ! top drag coefficient (linear case) (PUBLIC for TAM) REAL(wp), PUBLIC :: rn_tfri2 ! top drag coefficient (non linear case) (PUBLIC for TAM) REAL(wp), PUBLIC :: rn_tfri2_max ! Maximum top drag coefficient (non linear case and ln_loglayer=T) (PUBLIC for TAM) REAL(wp), PUBLIC :: rn_tfeb2 ! background top turbulent kinetic energy [m2/s2] (PUBLIC for TAM) REAL(wp), PUBLIC :: rn_tfrien ! local factor to enhance coefficient tfri (PUBLIC for TAM) LOGICAL , PUBLIC :: ln_tfr2d ! logical switch for 2D enhancement (PUBLIC for TAM) LOGICAL , PUBLIC :: ln_loglayer ! switch for log layer bfr coeff. (PUBLIC for TAM) REAL(wp), PUBLIC :: rn_bfrz0 ! bottom roughness for loglayer bfr coeff (PUBLIC for TAM) REAL(wp), PUBLIC :: rn_tfrz0 ! bottom roughness for loglayer bfr coeff (PUBLIC for TAM) LOGICAL , PUBLIC :: ln_bfrimp ! logical switch for implicit bottom friction REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:), PUBLIC :: bfrcoef2d, tfrcoef2d ! 2D bottom/top drag coefficient (PUBLIC for TAM) !! * Substitutions # include "vectopt_loop_substitute.h90" # include "domzgr_substitute.h90" !!---------------------------------------------------------------------- !! NEMO/OPA 4.0 , NEMO Consortium (2011) !! $Id$ !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) !!---------------------------------------------------------------------- CONTAINS INTEGER FUNCTION zdf_bfr_alloc() !!---------------------------------------------------------------------- !! *** FUNCTION zdf_bfr_alloc *** !!---------------------------------------------------------------------- ALLOCATE( bfrcoef2d(jpi,jpj), tfrcoef2d(jpi,jpj), STAT=zdf_bfr_alloc ) ! IF( lk_mpp ) CALL mpp_sum ( zdf_bfr_alloc ) IF( zdf_bfr_alloc /= 0 ) CALL ctl_warn('zdf_bfr_alloc: failed to allocate arrays.') END FUNCTION zdf_bfr_alloc SUBROUTINE zdf_bfr( kt ) !!---------------------------------------------------------------------- !! *** ROUTINE zdf_bfr *** !! !! ** Purpose : compute the bottom friction coefficient. !! !! ** Method : Calculate and store part of the momentum trend due !! to bottom friction following the chosen friction type !! (free-slip, linear, or quadratic). The component !! calculated here is multiplied by the bottom velocity in !! dyn_bfr to provide the trend term. !! The coefficients are updated at each time step only !! in the quadratic case. !! !! ** Action : bfrua , bfrva bottom friction coefficients !!---------------------------------------------------------------------- INTEGER, INTENT( in ) :: kt ! ocean time-step index !! INTEGER :: ji, jj ! dummy loop indices INTEGER :: ikbt, ikbu, ikbv ! local integers REAL(wp) :: zvu, zuv, zecu, zecv, ztmp ! temporary scalars REAL(wp), POINTER, DIMENSION(:,:) :: zbfrt, ztfrt !!---------------------------------------------------------------------- ! IF( nn_timing == 1 ) CALL timing_start('zdf_bfr') ! IF( kt == nit000 .AND. lwp ) THEN WRITE(numout,*) WRITE(numout,*) 'zdf_bfr : Set bottom friction coefficient (non-linear case)' WRITE(numout,*) '~~~~~~~~' ENDIF ! IF( nn_bfr == 2 ) THEN ! quadratic bottom friction only ! CALL wrk_alloc( jpi, jpj, zbfrt, ztfrt ) IF ( ln_loglayer.AND.lk_vvl ) THEN ! "log layer" bottom friction coefficient DO jj = 1, jpj DO ji = 1, jpi ikbt = mbkt(ji,jj) !! JC: possible WAD implementation should modify line below if layers vanish ztmp = tmask(ji,jj,ikbt) * ( vkarmn / LOG( 0.5_wp * fse3t_n(ji,jj,ikbt) / rn_bfrz0 ))**2._wp zbfrt(ji,jj) = MAX(bfrcoef2d(ji,jj), ztmp) zbfrt(ji,jj) = MIN(zbfrt(ji,jj), rn_bfri2_max) END DO END DO ! (ISF) IF ( ln_isfcav ) THEN DO jj = 1, jpj DO ji = 1, jpi ikbt = mikt(ji,jj) ! JC: possible WAD implementation should modify line below if layers vanish ztmp = (1-tmask(ji,jj,1)) * ( vkarmn / LOG( 0.5_wp * fse3t_n(ji,jj,ikbt) / rn_bfrz0 ))**2._wp ztfrt(ji,jj) = MAX(tfrcoef2d(ji,jj), ztmp) ztfrt(ji,jj) = MIN(ztfrt(ji,jj), rn_tfri2_max) END DO END DO END IF ! ELSE zbfrt(:,:) = bfrcoef2d(:,:) ztfrt(:,:) = tfrcoef2d(:,:) ENDIF DO jj = 2, jpjm1 DO ji = 2, jpim1 ikbu = mbku(ji,jj) ! ocean bottom level at u- and v-points ikbv = mbkv(ji,jj) ! (deepest ocean u- and v-points) ! zvu = 0.25 * ( vn(ji,jj ,ikbu) + vn(ji+1,jj ,ikbu) & & + vn(ji,jj-1,ikbu) + vn(ji+1,jj-1,ikbu) ) zuv = 0.25 * ( un(ji,jj ,ikbv) + un(ji-1,jj ,ikbv) & & + un(ji,jj+1,ikbv) + un(ji-1,jj+1,ikbv) ) ! zecu = SQRT( un(ji,jj,ikbu) * un(ji,jj,ikbu) + zvu*zvu + rn_bfeb2 ) zecv = SQRT( vn(ji,jj,ikbv) * vn(ji,jj,ikbv) + zuv*zuv + rn_bfeb2 ) ! bfrua(ji,jj) = - 0.5_wp * ( zbfrt(ji,jj) + zbfrt(ji+1,jj ) ) * zecu bfrva(ji,jj) = - 0.5_wp * ( zbfrt(ji,jj) + zbfrt(ji ,jj+1) ) * zecv ! ! in case of 2 cell water column, we assume each cell feels the top and bottom friction IF ( ln_isfcav ) THEN IF ( miku(ji,jj) + 1 .GE. mbku(ji,jj) ) THEN bfrua(ji,jj) = - 0.5_wp * ( ( zbfrt(ji,jj) + zbfrt(ji+1,jj ) ) & & + ( ztfrt(ji,jj) + ztfrt(ji+1,jj ) ) ) & & * zecu * (1._wp - umask(ji,jj,1)) END IF IF ( mikv(ji,jj) + 1 .GE. mbkv(ji,jj) ) THEN bfrva(ji,jj) = - 0.5_wp * ( ( zbfrt(ji,jj) + zbfrt(ji ,jj+1) ) & & + ( ztfrt(ji,jj) + ztfrt(ji ,jj+1) ) ) & & * zecv * (1._wp - vmask(ji,jj,1)) END IF END IF END DO END DO CALL lbc_lnk( bfrua, 'U', 1. ) ; CALL lbc_lnk( bfrva, 'V', 1. ) ! Lateral boundary condition IF ( ln_isfcav ) THEN DO jj = 2, jpjm1 DO ji = 2, jpim1 ! (ISF) ======================================================================== ikbu = miku(ji,jj) ! ocean top level at u- and v-points ikbv = mikv(ji,jj) ! (1st wet ocean u- and v-points) ! zvu = 0.25 * ( vn(ji,jj ,ikbu) + vn(ji+1,jj ,ikbu) & & + vn(ji,jj-1,ikbu) + vn(ji+1,jj-1,ikbu) ) zuv = 0.25 * ( un(ji,jj ,ikbv) + un(ji-1,jj ,ikbv) & & + un(ji,jj+1,ikbv) + un(ji-1,jj+1,ikbv) ) ! zecu = SQRT( un(ji,jj,ikbu) * un(ji,jj,ikbu) + zvu*zvu + rn_tfeb2 ) zecv = SQRT( vn(ji,jj,ikbv) * vn(ji,jj,ikbv) + zuv*zuv + rn_tfeb2 ) ! tfrua(ji,jj) = - 0.5_wp * ( ztfrt(ji,jj) + ztfrt(ji+1,jj ) ) * zecu * (1._wp - umask(ji,jj,1)) tfrva(ji,jj) = - 0.5_wp * ( ztfrt(ji,jj) + ztfrt(ji ,jj+1) ) * zecv * (1._wp - vmask(ji,jj,1)) ! (ISF) END ==================================================================== ! in case of 2 cell water column, we assume each cell feels the top and bottom friction IF ( miku(ji,jj) + 1 .GE. mbku(ji,jj) ) THEN tfrua(ji,jj) = - 0.5_wp * ( ( ztfrt(ji,jj) + ztfrt(ji+1,jj ) ) & & + ( zbfrt(ji,jj) + zbfrt(ji+1,jj ) ) ) & & * zecu * (1._wp - umask(ji,jj,1)) END IF IF ( mikv(ji,jj) + 1 .GE. mbkv(ji,jj) ) THEN tfrva(ji,jj) = - 0.5_wp * ( ( ztfrt(ji,jj) + ztfrt(ji ,jj+1) ) & & + ( zbfrt(ji,jj) + zbfrt(ji ,jj+1) ) ) & & * zecv * (1._wp - vmask(ji,jj,1)) END IF END DO END DO CALL lbc_lnk( tfrua, 'U', 1. ) ; CALL lbc_lnk( tfrva, 'V', 1. ) ! Lateral boundary condition END IF ! ! IF(ln_ctl) CALL prt_ctl( tab2d_1=bfrua, clinfo1=' bfr - u: ', mask1=umask, & & tab2d_2=bfrva, clinfo2= ' v: ', mask2=vmask,ovlap=1 ) CALL wrk_dealloc( jpi,jpj,zbfrt, ztfrt ) ENDIF ! IF( nn_timing == 1 ) CALL timing_stop('zdf_bfr') ! END SUBROUTINE zdf_bfr SUBROUTINE zdf_bfr_init !!---------------------------------------------------------------------- !! *** ROUTINE zdf_bfr_init *** !! !! ** Purpose : Initialization of the bottom friction !! !! ** Method : Read the nambfr namelist and check their consistency !! called at the first timestep (nit000) !!---------------------------------------------------------------------- USE iom ! I/O module for ehanced bottom friction file !! INTEGER :: inum ! logical unit for enhanced bottom friction file INTEGER :: ji, jj ! dummy loop indexes INTEGER :: ikbt, ikbu, ikbv ! temporary integers INTEGER :: ictu, ictv ! - - INTEGER :: ios REAL(wp) :: zminbfr, zmaxbfr ! temporary scalars REAL(wp) :: zmintfr, zmaxtfr ! temporary scalars REAL(wp) :: ztmp, zfru, zfrv ! - - !! NAMELIST/nambfr/ nn_bfr, rn_bfri1, rn_bfri2, rn_bfri2_max, rn_bfeb2, rn_bfrz0, ln_bfr2d, & & rn_tfri1, rn_tfri2, rn_tfri2_max, rn_tfeb2, rn_tfrz0, ln_tfr2d, & & rn_bfrien, rn_tfrien, ln_bfrimp, ln_loglayer !!---------------------------------------------------------------------- ! IF( nn_timing == 1 ) CALL timing_start('zdf_bfr_init') ! ! !* Allocate zdfbfr arrays IF( zdf_bfr_alloc() /= 0 ) CALL ctl_stop( 'STOP', 'zdf_bfr_init : unable to allocate arrays' ) ! ! !* Parameter control and print ! REWIND( numnam_ref ) ! Namelist nambfr in reference namelist : Bottom momentum boundary condition READ ( numnam_ref, nambfr, IOSTAT = ios, ERR = 901) 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nambfr in reference namelist', lwp ) REWIND( numnam_cfg ) ! Namelist nambfr in configuration namelist : Bottom momentum boundary condition READ ( numnam_cfg, nambfr, IOSTAT = ios, ERR = 902 ) 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nambfr in configuration namelist', lwp ) IF(lwm) WRITE ( numond, nambfr ) IF(lwp) WRITE(numout,*) IF(lwp) WRITE(numout,*) 'zdf_bfr_init : momentum bottom friction' IF(lwp) WRITE(numout,*) '~~~~~~~~~~~~~' IF(lwp) WRITE(numout,*) ' Namelist nam_bfr : set bottom friction parameters' ! SELECT CASE (nn_bfr) ! CASE( 0 ) IF(lwp) WRITE(numout,*) ' free-slip ' bfrua(:,:) = 0.e0 bfrva(:,:) = 0.e0 tfrua(:,:) = 0.e0 tfrva(:,:) = 0.e0 ! CASE( 1 ) IF(lwp) WRITE(numout,*) ' linear botton friction' IF(lwp) WRITE(numout,*) ' bottom friction coef. rn_bfri1 = ', rn_bfri1 IF( ln_bfr2d ) THEN IF(lwp) WRITE(numout,*) ' read coef. enhancement distribution from file ln_bfr2d = ', ln_bfr2d IF(lwp) WRITE(numout,*) ' coef rn_bfri2 enhancement factor rn_bfrien = ',rn_bfrien ENDIF IF ( ln_isfcav ) THEN IF(lwp) WRITE(numout,*) ' top friction coef. rn_bfri1 = ', rn_tfri1 IF( ln_tfr2d ) THEN IF(lwp) WRITE(numout,*) ' read coef. enhancement distribution from file ln_tfr2d = ', ln_tfr2d IF(lwp) WRITE(numout,*) ' coef rn_tfri2 enhancement factor rn_tfrien = ',rn_tfrien ENDIF END IF ! IF(ln_bfr2d) THEN ! bfr_coef is a coefficient in [0,1] giving the mask where to apply the bfr enhancement CALL iom_open('bfr_coef.nc',inum) CALL iom_get (inum, jpdom_data, 'bfr_coef',bfrcoef2d,1) ! bfrcoef2d is used as tmp array CALL iom_close(inum) bfrcoef2d(:,:) = rn_bfri1 * ( 1 + rn_bfrien * bfrcoef2d(:,:) ) ELSE bfrcoef2d(:,:) = rn_bfri1 ! initialize bfrcoef2d to the namelist variable ENDIF ! bfrua(:,:) = - bfrcoef2d(:,:) bfrva(:,:) = - bfrcoef2d(:,:) ! IF ( ln_isfcav ) THEN IF(ln_tfr2d) THEN ! tfr_coef is a coefficient in [0,1] giving the mask where to apply the bfr enhancement CALL iom_open('tfr_coef.nc',inum) CALL iom_get (inum, jpdom_data, 'tfr_coef',tfrcoef2d,1) ! tfrcoef2d is used as tmp array CALL iom_close(inum) tfrcoef2d(:,:) = rn_tfri1 * ( 1 + rn_tfrien * tfrcoef2d(:,:) ) ELSE tfrcoef2d(:,:) = rn_tfri1 ! initialize tfrcoef2d to the namelist variable ENDIF ! tfrua(:,:) = - tfrcoef2d(:,:) tfrva(:,:) = - tfrcoef2d(:,:) END IF ! CASE( 2 ) IF(lwp) WRITE(numout,*) ' quadratic bottom friction' IF(lwp) WRITE(numout,*) ' friction coef. rn_bfri2 = ', rn_bfri2 IF(lwp) WRITE(numout,*) ' Max. coef. (log case) rn_bfri2_max = ', rn_bfri2_max IF(lwp) WRITE(numout,*) ' background tke rn_bfeb2 = ', rn_bfeb2 IF(lwp) WRITE(numout,*) ' log formulation ln_bfr2d = ', ln_loglayer IF(lwp) WRITE(numout,*) ' bottom roughness rn_bfrz0 [m] = ', rn_bfrz0 IF( rn_bfrz0<=0.e0 ) THEN WRITE(ctmp1,*) ' bottom roughness must be strictly positive' CALL ctl_stop( ctmp1 ) ENDIF IF( ln_bfr2d ) THEN IF(lwp) WRITE(numout,*) ' read coef. enhancement distribution from file ln_bfr2d = ', ln_bfr2d IF(lwp) WRITE(numout,*) ' coef rn_bfri2 enhancement factor rn_bfrien = ',rn_bfrien ENDIF IF ( ln_isfcav ) THEN IF(lwp) WRITE(numout,*) ' quadratic top friction' IF(lwp) WRITE(numout,*) ' friction coef. rn_tfri2 = ', rn_tfri2 IF(lwp) WRITE(numout,*) ' Max. coef. (log case) rn_tfri2_max = ', rn_tfri2_max IF(lwp) WRITE(numout,*) ' background tke rn_tfeb2 = ', rn_tfeb2 IF(lwp) WRITE(numout,*) ' log formulation ln_tfr2d = ', ln_loglayer IF(lwp) WRITE(numout,*) ' top roughness rn_tfrz0 [m] = ', rn_tfrz0 IF( rn_tfrz0<=0.e0 ) THEN WRITE(ctmp1,*) ' top roughness must be strictly positive' CALL ctl_stop( ctmp1 ) ENDIF IF( ln_tfr2d ) THEN IF(lwp) WRITE(numout,*) ' read coef. enhancement distribution from file ln_tfr2d = ', ln_tfr2d IF(lwp) WRITE(numout,*) ' coef rn_tfri2 enhancement factor rn_tfrien = ',rn_tfrien ENDIF END IF ! IF(ln_bfr2d) THEN ! bfr_coef is a coefficient in [0,1] giving the mask where to apply the bfr enhancement CALL iom_open('bfr_coef.nc',inum) CALL iom_get (inum, jpdom_data, 'bfr_coef',bfrcoef2d,1) ! bfrcoef2d is used as tmp array CALL iom_close(inum) ! bfrcoef2d(:,:) = rn_bfri2 * ( 1 + rn_bfrien * bfrcoef2d(:,:) ) ELSE bfrcoef2d(:,:) = rn_bfri2 ! initialize bfrcoef2d to the namelist variable ENDIF IF ( ln_isfcav ) THEN IF(ln_tfr2d) THEN ! tfr_coef is a coefficient in [0,1] giving the mask where to apply the bfr enhancement CALL iom_open('tfr_coef.nc',inum) CALL iom_get (inum, jpdom_data, 'tfr_coef',tfrcoef2d,1) ! tfrcoef2d is used as tmp array CALL iom_close(inum) ! tfrcoef2d(:,:) = rn_tfri2 * ( 1 + rn_tfrien * tfrcoef2d(:,:) ) ELSE tfrcoef2d(:,:) = rn_tfri2 ! initialize tfrcoef2d to the namelist variable ENDIF END IF ! IF ( ln_loglayer.AND.(.NOT.lk_vvl) ) THEN ! set "log layer" bottom friction once for all DO jj = 1, jpj DO ji = 1, jpi ikbt = mbkt(ji,jj) ztmp = tmask(ji,jj,ikbt) * ( vkarmn / LOG( 0.5_wp * fse3t_n(ji,jj,ikbt) / rn_bfrz0 ))**2._wp bfrcoef2d(ji,jj) = MAX(bfrcoef2d(ji,jj), ztmp) bfrcoef2d(ji,jj) = MIN(bfrcoef2d(ji,jj), rn_bfri2_max) END DO END DO IF ( ln_isfcav ) THEN DO jj = 1, jpj DO ji = 1, jpi ikbt = mikt(ji,jj) ztmp = tmask(ji,jj,ikbt) * ( vkarmn / LOG( 0.5_wp * fse3t_n(ji,jj,ikbt) / rn_tfrz0 ))**2._wp tfrcoef2d(ji,jj) = MAX(tfrcoef2d(ji,jj), ztmp) tfrcoef2d(ji,jj) = MIN(tfrcoef2d(ji,jj), rn_tfri2_max) END DO END DO END IF ENDIF ! CASE DEFAULT IF(lwp) WRITE(ctmp1,*) ' bad flag value for nn_bfr = ', nn_bfr CALL ctl_stop( ctmp1 ) ! END SELECT ! IF(lwp) WRITE(numout,*) ' implicit bottom friction switch ln_bfrimp = ', ln_bfrimp ! ! ! Make sure ln_zdfexp=.false. when use implicit bfr IF( ln_bfrimp .AND. ln_zdfexp ) THEN IF(lwp) THEN WRITE(numout,*) WRITE(numout,*) 'Implicit bottom friction can only be used when ln_zdfexp=.false.' WRITE(numout,*) ' but you set: ln_bfrimp=.true. and ln_zdfexp=.true.!!!!' WRITE(ctmp1,*) ' set either ln_zdfexp = .false or ln_bfrimp = .false.' CALL ctl_stop( ctmp1 ) END IF END IF ! ! Basic stability check on bottom friction coefficient ! ictu = 0 ! counter for stability criterion breaches at U-pts ictv = 0 ! counter for stability criterion breaches at V-pts zminbfr = 1.e10_wp ! initialise tracker for minimum of bottom friction coefficient zmaxbfr = -1.e10_wp ! initialise tracker for maximum of bottom friction coefficient zmintfr = 1.e10_wp ! initialise tracker for minimum of bottom friction coefficient zmaxtfr = -1.e10_wp ! initialise tracker for maximum of bottom friction coefficient ! DO jj = 2, jpjm1 DO ji = 2, jpim1 ikbu = mbku(ji,jj) ! deepest ocean level at u- and v-points ikbv = mbkv(ji,jj) zfru = 0.5 * fse3u(ji,jj,ikbu) / rdt zfrv = 0.5 * fse3v(ji,jj,ikbv) / rdt IF( ABS( bfrcoef2d(ji,jj) ) > zfru ) THEN IF( ln_ctl ) THEN WRITE(numout,*) 'BFR ', narea, nimpp+ji, njmpp+jj, ikbu WRITE(numout,*) 'BFR ', ABS( bfrcoef2d(ji,jj) ), zfru ENDIF ictu = ictu + 1 ENDIF IF( ABS( bfrcoef2d(ji,jj) ) > zfrv ) THEN IF( ln_ctl ) THEN WRITE(numout,*) 'BFR ', narea, nimpp+ji, njmpp+jj, ikbv WRITE(numout,*) 'BFR ', bfrcoef2d(ji,jj), zfrv ENDIF ictv = ictv + 1 ENDIF zminbfr = MIN( zminbfr, MIN( zfru, ABS( bfrcoef2d(ji,jj) ) ) ) zmaxbfr = MAX( zmaxbfr, MIN( zfrv, ABS( bfrcoef2d(ji,jj) ) ) ) ! (ISF) IF ( ln_isfcav ) THEN ikbu = miku(ji,jj) ! 1st wet ocean level at u- and v-points ikbv = mikv(ji,jj) zfru = 0.5 * fse3u(ji,jj,ikbu) / rdt zfrv = 0.5 * fse3v(ji,jj,ikbv) / rdt IF( ABS( tfrcoef2d(ji,jj) ) > zfru ) THEN IF( ln_ctl ) THEN WRITE(numout,*) 'TFR ', narea, nimpp+ji, njmpp+jj, ikbu WRITE(numout,*) 'TFR ', ABS( tfrcoef2d(ji,jj) ), zfru ENDIF ictu = ictu + 1 ENDIF IF( ABS( tfrcoef2d(ji,jj) ) > zfrv ) THEN IF( ln_ctl ) THEN WRITE(numout,*) 'TFR ', narea, nimpp+ji, njmpp+jj, ikbv WRITE(numout,*) 'TFR ', tfrcoef2d(ji,jj), zfrv ENDIF ictv = ictv + 1 ENDIF zmintfr = MIN( zmintfr, MIN( zfru, ABS( tfrcoef2d(ji,jj) ) ) ) zmaxtfr = MAX( zmaxtfr, MIN( zfrv, ABS( tfrcoef2d(ji,jj) ) ) ) END IF ! END ISF END DO END DO IF( lk_mpp ) THEN CALL mpp_sum( ictu ) CALL mpp_sum( ictv ) CALL mpp_min( zminbfr ) CALL mpp_max( zmaxbfr ) IF ( ln_isfcav) CALL mpp_min( zmintfr ) IF ( ln_isfcav) CALL mpp_max( zmaxtfr ) ENDIF IF( .NOT.ln_bfrimp) THEN IF( lwp .AND. ictu + ictv > 0 ) THEN WRITE(numout,*) ' Bottom/Top friction stability check failed at ', ictu, ' U-points ' WRITE(numout,*) ' Bottom/Top friction stability check failed at ', ictv, ' V-points ' WRITE(numout,*) ' Bottom friction coefficient now ranges from: ', zminbfr, ' to ', zmaxbfr IF ( ln_isfcav ) WRITE(numout,*) ' Top friction coefficient now ranges from: ', zmintfr, ' to ', zmaxtfr WRITE(numout,*) ' Bottom/Top friction coefficient will be reduced where necessary' ENDIF ENDIF ! IF( nn_timing == 1 ) CALL timing_stop('zdf_bfr_init') ! END SUBROUTINE zdf_bfr_init !!====================================================================== END MODULE zdfbfr